On 04 Aug 2002 18:54:44 +0300, Erez Doron <[EMAIL PROTECTED]> wrote:
>
> i am writing a small app in C and i need to get the timezone
> ( e.g. -2:00 for israel )
> how do i do that ?
>
> the timezone variable from <time.h> returns 0
Bellow is my function for getting the offset (It should work on any
system, even M$Windoze). It is better than checking TZ because it
will have the DST included automatically.
Ehud.
static int get_ofst ( void ) /* compute offset from GMT */
{
#define FDAY 86400 /* full day in seconds 24*60*60 */
#define HDAY 43200 /* half day in seconds */
struct tm ofst;
long tloc ; /* seconds from 1/1/1970 0.0.0 GMT */
int sec_ofst ;
time (& tloc) ; /* get current time */
ofst = *gmtime (& tloc) ; /* find GMT hour */
sec_ofst = ( ofst.tm_hour * 60 +
ofst.tm_min ) * 60 +
ofst.tm_sec ; /* GMT hour (in seconds) */
ofst = *localtime (& tloc) ; /* find local hour */
sec_ofst = ( ( ofst.tm_hour * 60 +
ofst.tm_min ) * 60 +
ofst.tm_sec - sec_ofst
+ FDAY ) % FDAY ; /* Local - GMT hours (in seconds, 0-FDAY) */
if ( sec_ofst > HDAY )
sec_ofst -= FDAY ; /* sec_ofst in range -11:59:59 +12:00:00 */
sprintf ( p_date , "%02d/%02d/%02d" , /* save date */
ofst.tm_mday ,
( ofst.tm_mon + 1 ) ,
( ofst.tm_year % 100 ) ) ;
return ( sec_ofst ) ;
}
--
Ehud Karni Tel: +972-3-7966-561 /"\
Mivtach - Simon Fax: +972-3-7966-667 \ / ASCII Ribbon Campaign
Insurance agencies (USA) voice mail and X Against HTML Mail
http://www.mvs.co.il FAX: 1-815-5509341 / \
mailto:[EMAIL PROTECTED] Better Safe Than Sorry
=================================================================
To unsubscribe, send mail to [EMAIL PROTECTED] with
the word "unsubscribe" in the message body, e.g., run the command
echo unsubscribe | mail [EMAIL PROTECTED]
