Date and time functions#
- JULDAY#
Calculate the Julian Day Number for a given month, day, and year.
- Inputs:
month (integer) – month number (1 = January, …, 12 = December)
day (integer) – day of the month
year (integer) – year
- Outputs:
julday (integer) – Julian Day Number which begins at noon of the specified calendar date
- Calling sequence:
- From FORTRAN#
result = JULDAY(year, month, day)
- CALDAT#
Return the calendar date given julian day. This is the inverse of the function
JULDAY.- Inputs:
julday (integer) – Julian Day Number
- Outputs:
month (integer) – month number (1 = January, …, 12 = December)
day (integer) – day of the month
year (integer) – year
- Calling sequence:
- From FORTRAN#
call CALDAT(julian, year, month, day)
- GET_DOY#
Calculate the day of year for a given month, day, and year.
- Inputs:
month (integer) – month number (1 = January, …, 12 = December)
day (integer) – day of the month
year (integer) – year
- Outputs:
doy (integer) – day of year
- Calling sequence:
- From FORTRAN#
doy = GET_DOY(year, month, day)
- DECY2DATE_AND_TIME#
Calculate the date and time (year, month, day of month, day of year and Universal Time)
- Inputs:
dec_y (double) – decimal year, where
yyyy.0d0is January 1st at 00:00
- Outputs:
year (integer) – year
month (integer) – month number (1 = January, …, 12 = December)
day (integer) – day of the month
doy (integer) – day of year (1 for January 1st)
hour (integer) – UT hour of day (h)
minute (integer) – UT minute (min)
second (integer) – UT second (sec)
UT (double) – UT time of day (sec)
- Calling sequence:
- From FORTRAN#
CALL DECY2DATE_AND_TIME(Dec_y,Year,Month, Day, doy, hour,minute,second,UT)
- DATE_AND_TIME2DECY#
Calculate the decimal year from date and time.
- Inputs:
year (integer) – year
month (integer) – month number (1 = January, …, 12 = December)
day (integer) – day of the month
hour (integer) – UT hour of day (h)
minute (integer) – UT minute (min)
second (integer) – UT second (sec)
- Outputs:
dec_y (double) – decimal year, where
yyyy.0d0is January 1st at 00:00
- Calling sequence:
- From FORTRAN#
CALL DATE_AND_TIME2DECY(Year,Month,Day,hour,minute,second,Dec_y)
- DOY_AND_UT2DATE_AND_TIME#
Calculate month, day, year, hour, minute, second from year, day of year and UT.
- Inputs:
year (integer) – year
doy (integer) – day of year (1 for January 1st)
UT (double) – UT time of day (sec)
- Outputs:
month (integer) – month number (1 = January, …, 12 = December)
day (integer) – day of the month
hour (integer) – UT hour of day (h)
minute (integer) – UT minute (min)
second (integer) – UT second (sec)
- Calling sequence:
- From FORTRAN#
CALL DOY_AND_UT2DATE_AND_TIME(Year,Doy,UT,Month, Day, hour,minute,second)