SweDate

java.lang.Object
- swisseph.SweDate

All Implemented Interfaces:

java.io.Serializable
```
public class SweDate
extends java.lang.Object
implements java.io.Serializable
```
This class is a date class specialized for the use with the swisseph package. You will like to use it, if you need a Julian Day number or the deltaT for a date or a Julian Day or if like to convert from Gregorian to Julian calendar system or vice versa.
This is a port of the SwissEphemeris package to Java. See Astrodienst Zürich for more infos and the original authors.
You will find the complete documentation for the original SwissEphemeris package at http://www.astro.ch/swisseph/sweph_g.htm. By far most of the information there is directly valid for this port to Java as well.

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`FRIDAY` Constant for weekdays.
`static double`	`JD0` The Julian day number of 1970 January 1.0.
`static int`	`MONDAY` Constant for weekdays.
`static int`	`SATURDAY` Constant for weekdays.
`static boolean`	`SE_GREG_CAL`
`static boolean`	`SE_JUL_CAL`
`static boolean`	`SE_KEEP_DATE`
`static boolean`	`SE_KEEP_JD`
`static int`	`SUNDAY` Constant for weekdays.
`static int`	`THURSDAY` Constant for weekdays.
`static int`	`TUESDAY` Constant for weekdays.
`static int`	`WEDNESDAY` Constant for weekdays.

Constructor Summary

Constructors
Constructor and Description
`SweDate()` This constructs a new SweDate with a default of the current date and current time at GMT.
`SweDate(double jd)` This constructs a new SweDate with the given Julian Day number.
`SweDate(double jd, boolean calType)` This constructs a new SweDate with the given Julian Day number.
`SweDate(int year, int month, int day, double hour)` This constructs a new SweDate with the given date and time.
`SweDate(int year, int month, int day, double hour, boolean calType)` This constructs a new SweDate with the given date and time.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`boolean`	`checkDate()` Checks the date to see, if it is a valid date.
`boolean`	`checkDate(int year, int month, int day)` Checks the given date to see, if it is a valid date.
`boolean`	`checkDate(int year, int month, int day, double hour)` Checks the given date to see, if it is a valid date.
`boolean`	`getCalendarType()` Queries the type of calendar in effect - Gregorian or Julian calendar.
`static java.util.Date`	`getDate(double jd)` This will return a java.util.Date object from a julian day number.
`java.util.Date`	`getDate(long offset)` This will return a java.util.Date object with the date of this SweDate object.
`int`	`getDay()` Queries the day of this SweDate object.
`int`	`getDayOfWeekNr()` Queries the day of the week, i.e.
`static int`	`getDayOfWeekNr(double jd)` Queries the day of the week of the given Julian Day number (interpreted in the gregorian calendar system!).
`static int`	`getDayOfWeekNr(int year, int month, int day)` Queries the day of the week of the given date that is interpreted as being a date in the Gregorian or Julian calendar system depending on the date, the switch from Julian to Gregorian calendar system occured.
`static int`	`getDayOfWeekNr(int year, int month, int day, boolean calType)` Queries the day of the week of the given date that is interpreted as being a date in the given calendar system.
`double`	`getDeltaT()` Queries the delta T value for the date of this object.
`static double`	`getDeltaT(double tjd)` Queries the delta T value for the given Julian Day number - this is a static method.
`static double`	`getGlobalTidalAcc()` Returns the tidal acceleration used in calculations of delta T.
`double`	`getGregorianChange()` Returns the julian day number on which the Gregorian calendar system comes to be in effect.
`double`	`getHour()` Queries the hour of the day of this SweDate object.
`java.lang.String`	`getInvalidUTCDateError(int iyear, int imonth, int iday, int ihour, int imin, double dsec, boolean gregflag)` Returns a String error message, if the year, month, day, hour, minute and second fields do not describe a valid date.
`double[]`	`getJDfromUTC(int iyear, int imonth, int iday, int ihour, int imin, double dsec, boolean gregflag, boolean checkValidInput)` Calculates the julian day numbers (TT (==ET) and UT1) from a given date.
`double`	`getJulDay()` Queries the Julian Day number of this object.
`static double`	`getJulDay(int year, int month, int day, double hour)` Queries the Julian Day number of the given date in Gregorian calendar system - this is a static method.
`static double`	`getJulDay(int year, int month, int day, double hour, boolean calType)` Queries the Julian Day number of the given date that is interpreted as a date in the given calendar system - this is a static method.
`java.time.LocalDateTime`	`getLocalDateTime()` Returns a LocalDateTime object to be used with DateTimeFormatters.
`static java.time.LocalDateTime`	`getLocalDateTime(SweDate sd)` Returns a LocalDateTime object to be used with DateTimeFormatters.
`SDate`	`getLocalTimeFromUTC(int iyear, int imonth, int iday, int ihour, int imin, double dsec, double d_timezone)` Transform UTC to local time.
`int`	`getMonth()` Queries the month of this SweDate object.
`SDate`	`getUTCfromJDET(double tjd_et, boolean gregflag)` Calculates the UTC date from ET Julian day number.
`SDate`	`getUTCfromJDUT1(double tjd_ut, boolean gregflag)` Calculates the UTC date from UT1 (universal time) Julian day number.
`SDate`	`getUTCFromLocalTime(int iyear, int imonth, int iday, int ihour, int imin, double dsec, double d_timezone)` Transform local time to UTC.
`int`	`getYear()` Queries the year of this SweDate object.
`boolean`	`isValidUTCDate(int iyear, int imonth, int iday, int ihour, int imin, double dsec, boolean gregflag)` Determines, if the year, month, day, hour, minute and second fields describe a valid date.
`void`	`makeValidDate()` Makes the date to be a valid date.
`void`	`setCalendarType(boolean newCalType, boolean keepDate)` Sets the calendar type for this object.
`boolean`	`setDate(int newYear, int newMonth, int newDay, double newHour)` Sets a new date for this object.
`boolean`	`setDate(int newYear, int newMonth, int newDay, double newHour, boolean check)` Sets a new date for this object.
`boolean`	`setDay(int newDay)` Sets the day-part of the date.
`boolean`	`setDay(int newDay, boolean check)` Sets the day-part of the date.
`static void`	`setGlobalTidalAcc(double t_acc)` Sets the tidal acceleration used in calculations of delta T.
`void`	`setGregorianChange(double newJDCO)` Changes the date of the start of the Gregorian calendar system.
`void`	`setGregorianChange(int year, int month, int day)` Changes the date of the start of the Gregorian calendar system.
`boolean`	`setHour(double newHour)` Sets a new hour.
`void`	`setJulDay(double newJD)` Sets the new Julian Day for this object.
`boolean`	`setMonth(int newMonth)` Sets the month-part of the date.
`boolean`	`setMonth(int newMonth, boolean check)` Sets the year-part of the date.
`protected static void`	`setSwissEphObject(SwissEph swiss)` This method is needed to have a consistent global SwissData object "swed", whose contents may determine the tidal acceleration.
`boolean`	`setYear(int newYear)` Sets the year-part of the date.
`boolean`	`setYear(int newYear, boolean check)` Sets the year-part of the date.
`java.lang.String`	`toString()` Returns the date, calendar type (gregorian / julian), julian day number and the deltaT value of this object.
`void`	`updateCalendarType()` Update the calendar type according to the Gregorian calendar start date and the date of this object.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - SUNDAY
```
public static final int SUNDAY
```
    Constant for weekdays. SUNDAY is equal to 0.
    
    See Also:
    
    Constant Field Values
  - MONDAY
```
public static final int MONDAY
```
    Constant for weekdays. MONDAY is equal to 1.
    
    See Also:
    
    Constant Field Values
  - TUESDAY
```
public static final int TUESDAY
```
    Constant for weekdays. TUESDAY is equal to 2.
    
    See Also:
    
    Constant Field Values
  - WEDNESDAY
```
public static final int WEDNESDAY
```
    Constant for weekdays. WEDNESDAY is equal to 3.
    
    See Also:
    
    Constant Field Values
  - THURSDAY
```
public static final int THURSDAY
```
    Constant for weekdays. THURSDAY is equal to 4.
    
    See Also:
    
    Constant Field Values
  - FRIDAY
```
public static final int FRIDAY
```
    Constant for weekdays. FRIDAY is equal to 5.
    
    See Also:
    
    Constant Field Values
  - SATURDAY
```
public static final int SATURDAY
```
    Constant for weekdays. SATURDAY is equal to 6.
    
    See Also:
    
    Constant Field Values
  - SE_JUL_CAL
```
public static final boolean SE_JUL_CAL
```
    See Also:
    
    Constant Field Values
  - SE_GREG_CAL
```
public static final boolean SE_GREG_CAL
```
    See Also:
    
    Constant Field Values
  - SE_KEEP_DATE
```
public static final boolean SE_KEEP_DATE
```
    See Also:
    
    Constant Field Values
  - SE_KEEP_JD
```
public static final boolean SE_KEEP_JD
```
    See Also:
    
    Constant Field Values
  - JD0
```
public static final double JD0
```
    The Julian day number of 1970 January 1.0. Useful for conversions from or to a Date object.
    
    See Also:
    
    getDate(long), Constant Field Values
- Constructor Detail
  - SweDate
```
public SweDate()
```
    This constructs a new SweDate with a default of the current date and current time at GMT.
  - SweDate
```
public SweDate(double jd)
```
    This constructs a new SweDate with the given Julian Day number. The calendar system will be Gregorian after October 15, 1582 or Julian before that date.
    
    Parameters:
    
    jd - Julian Day number
  - SweDate
```
public SweDate(double jd,
               boolean calType)
```
    This constructs a new SweDate with the given Julian Day number. The dates will be calculated according to the given calendar system (Gregorian or Julian calendar).
    
    Parameters:
    
    jd - Julian Day number
    
    calType - calendar type (Gregorian or Julian calendar system)
    
    See Also:
    
    SE_GREG_CAL, SE_JUL_CAL
  - SweDate
```
public SweDate(int year,
               int month,
               int day,
               double hour)
```
    This constructs a new SweDate with the given date and time. The calendar type is automatically adjusted to Julian calendar system before October 15, 1582, and to Gregorian calendar system after and including that date. The dates from October 5 to October 14, 1582 had been skipped during the conversion to the Gregorian calendar, so we just convert any such date to Julian calendar system even though no such date did exist.
    
    Parameters:
    
    year - The year of the date
    
    month - The month of the date
    
    day - The day-number in a month of that date
    
    hour - The hour of the day
  - SweDate
```
public SweDate(int year,
               int month,
               int day,
               double hour,
               boolean calType)
```
    This constructs a new SweDate with the given date and time. The date numbers will be interpreted according to the given calendar system (Gregorian or Julian calendar).
    
    Parameters:
    
    year - The year of the date
    
    month - The month of the date
    
    day - The day-number of the date
    
    hour - The hour of the day
    
    calType - calendar type (Gregorian or Julian calendar system)
    
    See Also:
    
    SE_GREG_CAL, SE_JUL_CAL
- Method Detail
  - getJulDay
```
public double getJulDay()
```
    Queries the Julian Day number of this object.
    
    Returns:
    
    Julian Day number
  - getJulDay
```
public static double getJulDay(int year,
                               int month,
                               int day,
                               double hour)
```
    Queries the Julian Day number of the given date in Gregorian calendar system - this is a static method.
    
    Parameters:
    
    year - The year of the date
    
    month - The month of the date
    
    day - The day-number of the date
    
    hour - The hour of the day
    
    Returns:
    
    Julian Day number
  - getJulDay
```
public static double getJulDay(int year,
                               int month,
                               int day,
                               double hour,
                               boolean calType)
```
    Queries the Julian Day number of the given date that is interpreted as a date in the given calendar system - this is a static method.
    
    Parameters:
    
    year - The year of the date
    
    month - The month of the date
    
    day - The day-number of the date
    
    hour - The hour of the day
    
    calType - calendar type (Gregorian or Julian calendar system)
    
    Returns:
    
    Julian Day number
    
    See Also:
    
    SE_GREG_CAL, SE_JUL_CAL
  - getDayOfWeekNr
```
public int getDayOfWeekNr()
```
    Queries the day of the week, i.e. Sunday to Saturday as represented by an integer. Sunday is represented by 0, Saturday by 6. Any discontinuity in the sequence of weekdays is not taken into account! Attention: the numbers are different from the numbers returned by the java.awt.Calendar class!
    
    Returns:
    
    Number of the day of week
    
    See Also:
    
    SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY
  - getDayOfWeekNr
```
public static int getDayOfWeekNr(double jd)
```
    Queries the day of the week of the given Julian Day number (interpreted in the gregorian calendar system!). Sunday is represented by 0, Saturday by 6. Any discontinuity in the sequence of weekdays is not taken into account! Attention: the numbers are different from the numbers returned by the java.awt.Calendar class!
    
    Parameters:
    
    jd - The Julian Day number of the date
    
    Returns:
    
    Number of the day of week
    
    See Also:
    
    SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY
  - getDayOfWeekNr
```
public static int getDayOfWeekNr(int year,
                                 int month,
                                 int day)
```
    Queries the day of the week of the given date that is interpreted as being a date in the Gregorian or Julian calendar system depending on the date, the switch from Julian to Gregorian calendar system occured. Sunday is represented by 0, Saturday by 6. Any discontinuity in the sequence of weekdays is not taken into account! Attention: the numbers are different from the numbers returned by the java.awt.Calendar class!
    
    Parameters:
    
    year - The year of the date
    
    month - The month of the date
    
    day - The day-number of the date
    
    Returns:
    
    Number of the day of week
    
    See Also:
    
    SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY
  - getDayOfWeekNr
```
public static int getDayOfWeekNr(int year,
                                 int month,
                                 int day,
                                 boolean calType)
```
    Queries the day of the week of the given date that is interpreted as being a date in the given calendar system. Sunday is represented by 0, Saturday by 6. Any discontinuity in the sequence of weekdays is not taken into account! Attention: the numbers are different from the numbers returned by the java.awt.Calendar class!
    
    Parameters:
    
    year - The year of the date
    
    month - The month of the date
    
    day - The day-number of the date
    
    calType - calendar type (Gregorian or Julian calendar system)
    
    Returns:
    
    Number of the day of week
    
    See Also:
    
    SE_GREG_CAL, SE_JUL_CAL, SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY
  - getCalendarType
```
public boolean getCalendarType()
```
    Queries the type of calendar in effect - Gregorian or Julian calendar. This will effect what date you will get back for a given Julian Day.
    
    Returns:
    
    Calendar type
    
    See Also:
    
    SE_GREG_CAL, SE_JUL_CAL
  - getYear
```
public int getYear()
```
    Queries the year of this SweDate object.
    
    Returns:
    
    year
  - getMonth
```
public int getMonth()
```
    Queries the month of this SweDate object.
    
    Returns:
    
    month Attention: The month ranges from 1 to 12, this is different to the java.util.Calendar class!
  - getDay
```
public int getDay()
```
    Queries the day of this SweDate object.
    
    Returns:
    
    day number
  - getHour
```
public double getHour()
```
    Queries the hour of the day of this SweDate object.
    
    Returns:
    
    hour
  - getDeltaT
```
public double getDeltaT()
```
    Queries the delta T value for the date of this object.
    
    Returns:
    
    delta T
  - getDeltaT
```
public static double getDeltaT(double tjd)
```
    Queries the delta T value for the given Julian Day number - this is a static method. Delta T is calculated with a tidal acceleration of SE_TIDAL_DEFAULT.
    
    Parameters:
    
    tjd - Julian Day number
    
    Returns:
    
    delta T
    
    See Also:
    
    SweConst.SE_TIDAL_DEFAULT
  - getDate
```
public java.util.Date getDate(long offset)
```
    This will return a java.util.Date object with the date of this SweDate object. This is needed often in internationalisation of date and time formats. You can add an offset in milliseconds to account for timezones or daylight savings time, as SweDate is meant to be in UT time always.
    
    Parameters:
    
    offset - An offset in milliseconds to be added to the current date and time.
    
    Returns:
    
    a Date object initialised by this object
  - getDate
```
public static java.util.Date getDate(double jd)
```
    This will return a java.util.Date object from a julian day number.
    
    Parameters:
    
    jd - The julian day number for which to create a Date object.
    
    Returns:
    
    the Date object for the JD
  - setJulDay
```
public void setJulDay(double newJD)
```
    Sets the new Julian Day for this object. This operation does NOT change the calendar type (Gregorian or Julian calendar). Use methods setCalendarType() or updateCalendarType() for this.
    
    Parameters:
    
    newJD - Julian Day number
  - setCalendarType
```
public void setCalendarType(boolean newCalType,
                            boolean keepDate)
```
    Sets the calendar type for this object.
    
    Parameters:
    
    newCalType - Calendar type (Greogorian or Julian calendar)
    
    keepDate - Determines, if the date or the julian day should be fix in this operation.
    
    See Also:
    
    SE_GREG_CAL, SE_JUL_CAL, SE_KEEP_DATE, SE_KEEP_JD
  - updateCalendarType
```
public void updateCalendarType()
```
    Update the calendar type according to the Gregorian calendar start date and the date of this object.
  - setDate
```
public boolean setDate(int newYear,
                       int newMonth,
                       int newDay,
                       double newHour)
```
    Sets a new date for this object.
    
    Parameters:
    
    newYear - the year-part of the new date
    
    newMonth - the month-part of the new date [1-12]
    
    newDay - the day-part of the new date [1-31]
    
    newHour - the hour of the new date
    
    Returns:
    
    true
  - setDate
```
public boolean setDate(int newYear,
                       int newMonth,
                       int newDay,
                       double newHour,
                       boolean check)
```
    Sets a new date for this object. The input can be checked, if it is a valid date and can be modified, if not. See parameter "check".
    
    Parameters:
    
    newYear - the year-part of the new date
    
    newMonth - the month-part of the new date [1-12]
    
    newDay - the day-part of the new date [1-31]
    
    newHour - the hour of the new date
    
    check - if true it returns if the date is valid and converts the the date into a valid date
    
    Returns:
    
    true, if check==false, or if the date is valid. False otherwise
  - setYear
```
public boolean setYear(int newYear)
```
    Sets the year-part of the date.
    
    Parameters:
    
    newYear - The new year
    
    Returns:
    
    true
  - setYear
```
public boolean setYear(int newYear,
                       boolean check)
```
    Sets the year-part of the date. The input can be checked, if the result is a valid date and can be modified, if not. E.g., the date was 29th of february 2004, and the year gets set to 2001. 2001 does not have a 29th of february, so if parameter check is set to true, it will return false and modify the date to 1st of march 2001.
    
    Parameters:
    
    newYear - The new year
    
    check - check, if the resulting new date is a valid date and adjust the values for day, month or year if necessary
    
    Returns:
    
    true if check==false, or if the date is valid. False otherwise
  - setMonth
```
public boolean setMonth(int newMonth)
```
    Sets the month-part of the date.
    
    Parameters:
    
    newMonth - The new month
    
    Returns:
    
    true
  - setMonth
```
public boolean setMonth(int newMonth,
                        boolean check)
```
    Sets the year-part of the date. The input can be checked, if the result is a valid date and can be modified, if not.
    
    Parameters:
    
    newMonth - The new year
    
    check - check, if the resulting new date is a valid date and adjust the values for day, month or year if necessary
    
    Returns:
    
    true, if check==true, otherwise return true only, if the date is valid
    
    See Also:
    
    setYear(int, boolean)
  - setDay
```
public boolean setDay(int newDay)
```
    Sets the day-part of the date.
    
    Parameters:
    
    newDay - The new day
    
    Returns:
    
    true
  - setDay
```
public boolean setDay(int newDay,
                      boolean check)
```
    Sets the day-part of the date. The input can be checked, if the result is a valid date and can be modified, if not.
    
    Parameters:
    
    newDay - The new day
    
    check - check, if the resulting new date is a valid date and adjust the values for day, month or year if necessary
    
    Returns:
    
    true, if check==true, otherwise return true only, if the date is valid
    
    See Also:
    
    setYear(int, boolean)
  - setHour
```
public boolean setHour(double newHour)
```
    Sets a new hour.
    
    Parameters:
    
    newHour - The new hour
    
    Returns:
    
    true
  - checkDate
```
public boolean checkDate()
```
    Checks the date to see, if it is a valid date.
    
    Returns:
    
    true, if the date is valid, false, if not
  - checkDate
```
public boolean checkDate(int year,
                         int month,
                         int day)
```
    Checks the given date to see, if it is a valid date.
    
    Parameters:
    
    year - the year, for which is to be checked
    
    month - the month, for which is to be checked
    
    day - the day, for which is to be checked
    
    Returns:
    
    true, if the date is valid, false, if not
  - checkDate
```
public boolean checkDate(int year,
                         int month,
                         int day,
                         double hour)
```
    Checks the given date to see, if it is a valid date.
    
    Parameters:
    
    year - the year, for which is to be checked
    
    month - the month, for which is to be checked
    
    day - the day, for which is to be checked
    
    hour - the hour, for which is to be checked
    
    Returns:
    
    true, if the date is valid, false, if not
  - makeValidDate
```
public void makeValidDate()
```
    Makes the date to be a valid date.
  - getGregorianChange
```
public double getGregorianChange()
```
    Returns the julian day number on which the Gregorian calendar system comes to be in effect.
    
    Returns:
    
    Julian day number of the date, the Gregorian calendar started
  - setGregorianChange
```
public void setGregorianChange(int year,
                               int month,
                               int day)
```
    Changes the date of the start of the Gregorian calendar system. This method will keep the date and change the julian day number of the date of this SweDate object if required.
    
    Parameters:
    
    year - The year (in Gregorian system) for the new start date
    
    month - The month (in Gregorian system) for the new start date. Adversely to java.util.Calendar, the month is to be given in the range of 1 for January to 12 for December!
    
    day - The day of the month (in Gregorian system, from 1 to 31) for the new start date
  - setGregorianChange
```
public void setGregorianChange(double newJDCO)
```
    Changes the date of the start of the Gregorian calendar system. This method will keep the julian day number and change year, month and day of the date of this SweDate object if required.
    
    Parameters:
    
    newJDCO - The julian day number, on which the Gregorian calendar came into effect.
  - getGlobalTidalAcc
```
public static double getGlobalTidalAcc()
```
    Returns the tidal acceleration used in calculations of delta T.
    Was double swe_get_tid_acc() in the original C sources.
    
    Returns:
    
    Tidal acceleration
  - setGlobalTidalAcc
```
public static void setGlobalTidalAcc(double t_acc)
```
    Sets the tidal acceleration used in calculations of delta T. t_acc can be either
    - the value of the tidal acceleration in arcsec/cty^2. You might want to use the constants SE_TIDAL_* below
    - SE_TIDAL_AUTOMATIC, Corresponds to void swe_set_tid_acc(double) method in the original C version.
    ATTENTION: this method changes the tidal acceleration of the moon globally, so any calculation of delta T following this call will be affected.
    
    Parameters:
    
    t_acc - tidal acceleration
    
    See Also:
    
    SweConst.SE_TIDAL_DE403, SweConst.SE_TIDAL_DE404, SweConst.SE_TIDAL_DE405, SweConst.SE_TIDAL_DE406, SweConst.SE_TIDAL_DE421, SweConst.SE_TIDAL_DE430, SweConst.SE_TIDAL_DE431, SweConst.SE_TIDAL_DE200, SweConst.SE_TIDAL_26, SweConst.SE_TIDAL_AUTOMATIC, SweConst.SE_TIDAL_DEFAULT
  - setSwissEphObject
```
protected static void setSwissEphObject(SwissEph swiss)
```
    This method is needed to have a consistent global SwissData object "swed", whose contents may determine the tidal acceleration. Called from the SwissEph constructor only.
    
    Parameters:
    
    swiss - The SwissEph object to be used
  - toString
```
public java.lang.String toString()
```
    Returns the date, calendar type (gregorian / julian), julian day number and the deltaT value of this object.
    
    Overrides:
    
    toString in class java.lang.Object
    
    Returns:
    
    Infos about this object
  - getUTCFromLocalTime
```
public SDate getUTCFromLocalTime(int iyear,
                                 int imonth,
                                 int iday,
                                 int ihour,
                                 int imin,
                                 double dsec,
                                 double d_timezone)
```
    Transform local time to UTC. For time zones east of Greenwich, d_timezone is positive. For time zones west of Greenwich, d_timezone is negative.
    
    Parameters:
    
    iyear - Year of the input date (UTC)
    
    imonth - Month of the input date (UTC, 1 to 12)
    
    iday - Day of the input date (UTC, 1 to 31)
    
    ihour - Hour of the input date (UTC, 0 to 23)
    
    imin - Minute of the input date (UTC, 0 to 59)
    
    dsec - Second of the input date (UTC, 0.0 to less than 61.0)
    
    d_timezone - Timezone in hours
    
    Returns:
    
    The converted date fields
    
    See Also:
    
    getLocalTimeFromUTC(int, int, int, int, int, double, double)
  - getLocalTimeFromUTC
```
public SDate getLocalTimeFromUTC(int iyear,
                                 int imonth,
                                 int iday,
                                 int ihour,
                                 int imin,
                                 double dsec,
                                 double d_timezone)
```
    Transform UTC to local time. This method is identical to the swe_utc_time_zone() method in the original API from AstroDienst Zurich. For time zones east of Greenwich, d_timezone is positive. For time zones west of Greenwich, d_timezone is negative.
    
    Parameters:
    
    iyear - Year of the input date (UTC)
    
    imonth - Month of the input date (UTC, 1 to 12)
    
    iday - Day of the input date (UTC, 1 to 31)
    
    ihour - Hour of the input date (UTC, 0 to 23)
    
    imin - Minute of the input date (UTC, 0 to 59)
    
    dsec - Second of the input date (UTC, 0.0 to less than 61.0)
    
    d_timezone - Timezone in hours. You can use -d_timezone to reverse the conversion, but you may also use the getUTCFromLocalTime() method for this.
    
    Returns:
    
    The converted date fields
    
    See Also:
    
    getUTCFromLocalTime(int, int, int, int, int, double, double)
  - isValidUTCDate
```
public boolean isValidUTCDate(int iyear,
                              int imonth,
                              int iday,
                              int ihour,
                              int imin,
                              double dsec,
                              boolean gregflag)
```
    Determines, if the year, month, day, hour, minute and second fields describe a valid date.
    
    Parameters:
    
    iyear - Year of the input date (UTC)
    
    imonth - Month of the input date (UTC, 1 to 12)
    
    iday - Day of the input date (UTC, 1 to 31)
    
    ihour - Hour of the input date (UTC, 0 to 23)
    
    imin - Minute of the input date (UTC, 0 to 59)
    
    dsec - Second of the input date (UTC, 1.0 to less than 61.0)
    
    gregflag - true == Gregorian calendar, false == Julian calendar
    
    Returns:
    
    true, if the date is valid, false otherwise.
  - getInvalidUTCDateError
```
public java.lang.String getInvalidUTCDateError(int iyear,
                                               int imonth,
                                               int iday,
                                               int ihour,
                                               int imin,
                                               double dsec,
                                               boolean gregflag)
```
    Returns a String error message, if the year, month, day, hour, minute and second fields do not describe a valid date.
    
    Parameters:
    
    iyear - Year of the input date (UTC)
    
    imonth - Month of the input date (UTC, 1 to 12)
    
    iday - Day of the input date (UTC, 1 to 31)
    
    ihour - Hour of the input date (UTC, 0 to 23)
    
    imin - Minute of the input date (UTC, 0 to 59)
    
    dsec - Second of the input date (UTC, 1.0 to less than 61.0)
    
    gregflag - true == Gregorian calendar, false == Julian calendar
    
    Returns:
    
    null, if the date is valid, otherwise it returns a message in english, describing the error field.
  - getJDfromUTC
```
public double[] getJDfromUTC(int iyear,
                             int imonth,
                             int iday,
                             int ihour,
                             int imin,
                             double dsec,
                             boolean gregflag,
                             boolean checkValidInput)
                      throws SwissephException
```
    Calculates the julian day numbers (TT (==ET) and UT1) from a given date.
    Parameters:
    
    iyear - Year of the input date (UTC)
    
    imonth - Month of the input date (UTC, 1 to 12)
    
    iday - Day of the input date (UTC, 1 to 31)
    
    ihour - Hour of the input date (UTC, 0 to 23)
    
    imin - Minute of the input date (UTC, 0 to 59)
    
    dsec - Second of the input date (UTC, 1.0 to less than 61.0)
    
    gregflag - true == Gregorian calendar, false == Julian calendar
    
    checkValidInput - if true, throws SwissephException, when any of month, day, hour, minute or second are out of their valid ranges. If false, it doesn't care about invalid values (e.g. month = 13 or second = 61, even though there is no leap second on that date and time).
    
    Returns:
    an array of two doubles
    first value = Julian day number TT (ET)
    second value = Julian day number UT1
    Note:
    - Before 1972, swe_utc_to_jd() treats its input time as UT1. Note: UTC was introduced in 1961. From 1961 - 1971, the length of the UTC second was regularly changed, so that UTC remained very close to UT1. - From 1972 on, input time is treated as UTC. - If delta_t - nleap - 32.184 > 1, the input time is treated as UT1. Note: Like this we avoid errors greater than 1 second in case that the leap seconds table (or the Swiss Ephemeris version) is not updated for a long time.
    Throws:
    
    SwissephException
    
    See Also:
    
    getUTCfromJDET(double, boolean), getUTCfromJDUT1(double, boolean), SE_GREG_CAL, SE_JUL_CAL
  - getUTCfromJDET
```
public SDate getUTCfromJDET(double tjd_et,
                            boolean gregflag)
```
    Calculates the UTC date from ET Julian day number.
    Parameters:
    
    tjd_et - Julian day number (ET) to be converted.
    
    gregflag - true == Gregorian calendar, false == Julian calendar
    
    Returns:
    The UTC date as SDate object. Note:
    - Before 1 jan 1972 UTC, output UT1. Note: UTC was introduced in 1961. From 1961 - 1971, the length of the UTC second was regularly changed, so that UTC remained very close to UT1. - From 1972 on, output is UTC. - If delta_t - nleap - 32.184 > 1, the output is UT1. Note: Like this we avoid errors greater than 1 second in case that the leap seconds table (or the Swiss Ephemeris version) has not been updated for a long time.
    See Also:
    
    getUTCfromJDUT1(double, boolean), SDate, SE_GREG_CAL, SE_JUL_CAL
  - getUTCfromJDUT1
```
public SDate getUTCfromJDUT1(double tjd_ut,
                             boolean gregflag)
```
    Calculates the UTC date from UT1 (universal time) Julian day number.
    Parameters:
    
    tjd_ut - Julian day number (UT1) to be converted.
    
    gregflag - true == Gregorian calendar, false == Julian calendar
    
    Returns:
    The UTC date as SDate object. Note:
    - Before 1 jan 1972 UTC, output UT1. Note: UTC was introduced in 1961. From 1961 - 1971, the length of the UTC second was regularly changed, so that UTC remained very close to UT1. - From 1972 on, output is UTC. - If delta_t - nleap - 32.184 > 1, the output is UT1. Note: Like this we avoid errors greater than 1 second in case that the leap seconds table (or the Swiss Ephemeris version) has not been updated for a long time.
    See Also:
    
    getUTCfromJDET(double, boolean), SDate, SE_GREG_CAL, SE_JUL_CAL
  - getLocalDateTime
```
public java.time.LocalDateTime getLocalDateTime()
```
    Returns a LocalDateTime object to be used with DateTimeFormatters. E.g.:
```
 DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy/mm/dd-hh:mm:ss-a (HH:mm:ss'h')");

 System.out.println(new SweDate(2016, 5, 31, 0 + 9/60. + 53/3600.).getLocalDateTime().format(dtf));
 
```
    Returns:
    
    The java.time.LocalDateTime object for this SweDate object
  - getLocalDateTime
```
public static java.time.LocalDateTime getLocalDateTime(SweDate sd)
```
    Returns a LocalDateTime object to be used with DateTimeFormatters. E.g.:
```
 DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy/mm/dd-hh:mm:ss-a (HH:mm:ss'h')");

 SweDate sd = new SweDate();
 System.out.println(SweDate.getLocalDateTime(sd).format(dtf));
 
```
    Returns:
    
    The java.time.LocalDateTime object for the SweDate object

Class SweDate

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

SUNDAY

MONDAY

TUESDAY

WEDNESDAY

THURSDAY

FRIDAY

SATURDAY

SE_JUL_CAL

SE_GREG_CAL

SE_KEEP_DATE

SE_KEEP_JD

JD0

Constructor Detail

SweDate

SweDate

SweDate

SweDate

SweDate

Method Detail

getJulDay

getJulDay

getJulDay

getDayOfWeekNr

getDayOfWeekNr

getDayOfWeekNr

getDayOfWeekNr

getCalendarType

getYear

getMonth

getDay

getHour

getDeltaT

getDeltaT

getDate

getDate

setJulDay

setCalendarType

updateCalendarType

setDate

setDate

setYear

setYear

setMonth

setMonth

setDay

setDay

setHour

checkDate

checkDate

checkDate

makeValidDate

getGregorianChange

setGregorianChange

setGregorianChange

getGlobalTidalAcc

setGlobalTidalAcc

setSwissEphObject

toString

getUTCFromLocalTime

getLocalTimeFromUTC

isValidUTCDate

getInvalidUTCDateError

getJDfromUTC

getUTCfromJDET

getUTCfromJDUT1

getLocalDateTime

getLocalDateTime