timezone —
return the timezone abbreviation
Standard C Library (libc, -lc)
char *
timezone(int
  zone, int dst);
This interface is available for compatibility only and will
  disappear in a future software release; it is impossible to reliably map
  timezone's arguments to a time zone abbreviation. See
  
ctime(3); see
  
tzset(3) for the new definition
  of this interface.
The timezone() function returns a pointer
    to a time zone abbreviation for the specified zone and
    dst values. Zone is the number
    of minutes west of GMT and dst is non-zero if daylight
    savings time is in effect.
A timezone() function appeared in
  Version 7 AT&T UNIX.