03-13-2009
Try
<?
print_r($col);
print_r($person);
?>
in order to see data structure
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TZFILE(5) File Formats Manual TZFILE(5)
NAME
tzfile - time zone information
SYNOPSIS
#include <tzfile.h>
DESCRIPTION
The time zone information files used by tzset(3) begin with bytes reserved for future use, followed by three four-byte values of type long,
written in a ``standard'' byte order (the high-order byte of the value is written first). These values are, in order:
tzh_timecnt
The number of "transition times" for which data is stored in the file.
tzh_typecnt
The number of "local time types" for which data is stored in the file (must not be zero).
tzh_charcnt
The number of characters of "time zone abbreviation strings" stored in the file.
The above header is followed by tzh_timecnt four-byte values of type long, sorted in ascending order. These values are written in ``stan-
dard'' byte order. Each is used as a transition time (as returned by time(2)) at which the rules for computing local time change. Next
come tzh_timecnt one-byte values of type unsigned char; each one tells which of the different types of ``local time'' types described in
the file is associated with the same-indexed transition time. These values serve as indices into an array of ttinfo structures that
appears next in the file; these structures are defined as follows:
struct ttinfo {
long tt_gmtoff;
int tt_isdst;
unsigned int tt_abbrind;
};
Each structure is written as a four-byte value for tt_gmtoff of type long, in a standard byte order, followed by a one-byte value for
tt_isdst and a one-byte value for tt_abbrind. In each structure, tt_gmtoff gives the number of seconds to be added to GMT, tt_isdst tells
whether tm_isdst should be set by localtime (3) and tt_abbrind serves as an index into the array of time zone abbreviation characters that
follow the ttinfo structure(s) in the file.
Localtime uses the first standard-time ttinfo structure in the file (or simply the first ttinfo structure in the absence of a standard-time
structure) if either tzh_timecnt is zero or the time argument is less than the first transition time recorded in the file.
SEE ALSO
ctime(3)
System V TZFILE(5)