DECdts

   You can use the Digital Distributed Time Service (DECdts)
   programming routines to obtain timestamps that are based on
   Coordinated Universal Time (UTC). You can also use the DECdts
   routines to translate among different timestamp formats and
   perform calculations on timestamps. Applications can use the
   timestamps that DECdts supplies to determine event sequencing,
   duration, and scheduling. Applications can call the DECdts
   routines from DECdts server or clerk systems.

   The Digital Distributed Time Service routines are written in
   the C programming language. You should be familiar with the
   basic DECdts concepts before you attempt to use the applications
   programming interface (API).

   The DECdts API routines can perform the following basic
   functions:

   o  Retrieve timestamp information

   o  Convert between binary timestamps that use different time
      structures

   o  Convert between binary timestamps and ASCII representations

   o  Convert between UTC time and local time

   o  Convert the binary time values in the OpenVMS (Smithsonian-
      based) format to or from UTC-based binary timestamps (OpenVMS
      systems only)

   o  Manipulate binary timestamps

   o  Compare two binary time values

   o  Calculate binary time values

   o  Obtain time zone information

   DECdts can convert between several types of binary time
   structures that are based on different calendars and time unit
   measurements. DECdts uses UTC-based time structures and can
   convert other types of time structures to its own presentation
   of UTC-based time.
 

Additional information available:

Time_Terminology                utc_abstime     utc_addtime     utc_anytime
utc_anyzone     utc_ascanytime  utc_ascgmtime   utc_asclocaltime
utc_ascreltime  utc_binreltime  utc_bintime     utc_boundtime
utc_cmpintervaltime             utc_cmpmidtime  utc_gettime     utc_getusertime
utc_gmtime      utc_gmtzone     utc_localtime   utc_localzone   utc_mkanytime
utc_mkascreltime                utc_mkasctime   utc_mkbinreltime
utc_mkbintime   utc_mkgmtime    utc_mklocaltime utc_mkreltime
utc_mkvmsanytime                utc_mkvmsgmtime utc_mkvmslocaltime
utc_mulftime    utc_multime     utc_pointtime   utc_reltime     utc_spantime
utc_subtime     utc_vmsanytime  utc_vmsgmtime   utc_vmslocaltime
Example