tzfile(5) [centos man page]
TZFILE(5) Linux Programmer's Manual TZFILE(5) NAME
tzfile - timezone information DESCRIPTION
This page describes the structure of the timezone files used by tzset(3). These files are typically found under one of the directories /usr/lib/zoneinfo or /usr/share/zoneinfo. Timezone information files begin with the magic characters "TZif" to identify them as timezone information files, followed by a character identifying the version of the file's format (as of 2005, either an ASCII NUL ('