Documentation

Time zone utilities Wrappers for C runtime library functions relating to timezones. The t_tzset() function (similar to tzset) uses the current setting of the environment variable TZ to assign values to three global variables: daylight, timezone, and tzname. These variables have the following meanings, and are declared in <time.h>. daylight Nonzero if daylight-saving-time zone (DST) is specified in TZ; otherwise, 0. Default value is 1. timezone Difference in seconds between coordinated universal time and local time. E.g., -28,800 for PST (GMT-8hrs) tzname(0) Three-letter time-zone name derived from TZ environment variable. E.g., "PST". tzname(1) Three-letter DST zone name derived from TZ environment variable. E.g., "PDT". If DST zone is omitted from TZ, tzname(1) is an empty string. Notes: For example, to set the TZ environment variable to correspond to the current time zone in Germany, you can use one of the following statements: set TZ=GST1GDT set TZ=GST+1GDT If the TZ value is not set, t_tzset() attempts to use the time zone information specified by the operating system. Under Windows NT and Windows 95, this information is specified in the Control Panel�s Date/Time application.