EPOCH Data Type

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EPOCH Data Type

CDF_EPOCH

8-byte, double precision floating point.

The EPOCH data type is used to store time values referenced from a particular epoch. For NSSDC applications that epoch is 01-Jan-0000 00:00:00.000. CDF_EPOCH values are the number of milliseconds since the epoch. CDF toolkit programs will display and expect CDF_EPOCH values in the format dd-mmm-yyyy hh:mm:ss.ccc where dd is the day of the month, 1-31, mmm is the month, Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, or Dec, yyyy is the year, AD, hh is the hour, 0-23, mm is the minute, 0-59, ss is the second, 0-59, and ccc is the millisecond, 0-999. Functions exist that parse, encode, compute, and break down CDF_EPOCH values. These functions are described in the CDF C Reference Manual for C applications and in the CDF Fortran Reference Manual for Fortran applications. cdfsupport@nssdca.gsfc.nasa.gov