Header File 

time.h 

Syntax 

extern char * _tzname[2] 

extern wchar_t *const _wtzname[2] 

Description 

The global variable _tzname is an array of pointers to strings containing abbreviations for time zone names. _tzname[0] points to a three-character string with the value of the time zone name from the TZ environment string. The global variable _tzname[1] points to a three-character string with the value of the daylight saving time zone name from the TZ environment string. If no daylight saving name is present, _tzname[1] points to a null string. 

On Win32, the value of _tzname is obtained from the operating system.