CDF_EPOCH_FROMJULDAYS
-------------------

The CDF_EPOCH_FROMJULDAYS function converts Julian day(s) to CDF epoch value(s),
in CDF_EPOCH, CDF_EPOCH16 or CDF_TIME_TT2000 data type. The input Julian data 
can be a single day or a vector of days, each day is a double, similar to
IDL's JULDAY returned object.  Optionally, the returned epochs can be in a
string(s) of ISO 8601 format.

Note
   You must set one of the EPOCH, LONGEPOCH or TT2000 keywords. 

Syntax 
   Result = CDF_EPOCH_FROMJULDAYS (julday, [,/EPOCH] [,/LONGEPOCH],
                                           [,/TT2000] [,/STRING]) 

Arguments 
   julday   An Julian value(s)


Keywords 
   EPOCH    The Epoch value is of CDF_EPOCH data type
   LONGEPOCH The Epoch value is of CDF_EPOCH16 data type
   TT2000   The Epoch value is of CDF_TIME_TT2000 data type
   
   STRING   Signal that the returned date(s) in ISO 8601 format string

Examples 
   cdf_epoch, epoch, 2020, 2, 3, 4, 5, 6, 777, /compute_epoch
   julday = cdf_epoch_tojuldays(epoch)
   epoch2 = cdf_epoch_fromjuldays (epoch, /epoch)
   str_epoch2 = cdf_epoch_fromjuldays (epoch, /epoch, /string)

Version History 
  Introduced:  CDF V3.8.0

See Also 
  CDF_EPOCH, CDF_EPOCH16, CDF_TT2000, CDF_EPOCH_TOJULDAYS