tzfile(5) [linux man page]
TZFILE(5) Linux Programmer's Manual TZFILE(5) NAME
tzfile - time zone information SYNOPSIS
#include <tzfile.h> DESCRIPTION
This page describes the structure of timezone files as commonly found in /usr/lib/zoneinfo or /usr/share/zoneinfo. The time zone information files used by tzset(3) begin with the magic characters "TZif" to identify then as time zone information files, followed by a character identifying the version of the file's format (as of 2005, either an ASCII NUL ('