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FreeBSD 11.0 - man page for timezone (freebsd section 3)

TIMEZONE(3)						   BSD Library Functions Manual 					       TIMEZONE(3)

NAME
timezone -- return the timezone abbreviation
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
char * timezone(int zone, int dst);
DESCRIPTION
This interface is for compatibility only; it is impossible to reliably map timezone's arguments to a time zone abbreviation. See ctime(3). The timezone() function returns a pointer to a time zone abbreviation for the specified zone and dst values. The zone argument is the number of minutes west of GMT and dst is non-zero if daylight savings time is in effect.
SEE ALSO
ctime(3)
HISTORY
A timezone() function appeared in Version 7 AT&T UNIX.
BSD
April 19, 1994 BSD

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