IDL-CDF Changes Log:

IDL V3.7.0
   1. Used CDF V3.7.0
   2. Modified CDF_EPOCH, CDF_EPOCH16, CDF_TT2000, CDF_EPOCH_COMPARE and
      CDF_EPOCH_DIFF help text to indicate that an input of array is allowed.

IDL V3.7.1
   1. Used CDF V3.7.1
   2. Allowed to operate CDF epoch data of multi-dimensional (> 2).
   3. Added a new function, CDF_EPOCH_UNIXTIME to convert CDF epoch data
      (CDF_EPOCH, CDF_EPOCH16 or CDF_TIME_TT2000) to and from Unix time.
      The Unix time, a double, is seconds from epoch (1970-01-01 00:00:00.000 
      GMT). Sub-second is allowed in the Unix time at the fractional part with
      the time resolution down to microseconds. Different time resolution at 
      CDF epoch and Unix time may casue the finer resolution in one epoch to
      be lost in the other.