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Top Forums Shell Programming and Scripting Set system date to some date (Sunos) Post 302378401 by jim mcnamara on Monday 7th of December 2009 09:16:48 PM
Old 12-07-2009
IF you set the system date using the date command ( assuming you are not running ntpd or xtnpd) then that will change the system time.

Anything else is just sort of silly. You can use TZ to mess around with a few days, as you have discovered, but it is NOT changing the system date: that is set as the number of seconds since Jan 1 1970. To truly change the date you have to reset system time with the date command - which is NOT a great idea. crontab can get confused, for example.

What are you really trying to accomplish - answer does not include not playing with TZ?
 

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libapache2-mod-perl2-2.0.7::docs::api::APR::Date(3pm)	User Contributed Perl Documentation  libapache2-mod-perl2-2.0.7::docs::api::APR::Date(3pm)

NAME
APR::Date - Perl API for APR date manipulating functions Synopsis use APR::Date (); # parse HTTP-complient date string $date_string = 'Sun, 06 Nov 1994 08:49:37 GMT'; $date_parsed = APR::Date::parse_http($date_string); # parse RFC822-complient date string $date_string = 'Sun, 6 Nov 94 8:49:37 GMT'; $date_parsed = APR::Date::parse_rfc($date_string); Description "APR::Socket" provides the Perl interface to APR date manipulating functions. API
"APR::Date" provides the following functions and/or methods: "parse_http" Parse HTTP date strings $date_parsed = parse_http($date_string); arg1: $date_string ( string ) The date string can be in one of the following formats: Sun, 06 Nov 1994 08:49:37 GMT ; RFC 822, updated by RFC 1123 Sunday, 06-Nov-94 08:49:37 GMT ; RFC 850, obsoleted by RFC 1036 Sun Nov 6 08:49:37 1994 ; ANSI C's asctime() format refer to RFC2616 for the details (GMT is assumed, regardless of the used timezone). ret: $date_parsed ( number ) the number of microseconds since 1 Jan 1970 GMT, or 0 if out of range or if the date is invalid. since: 2.0.00 Remember to divide the return value by 1_000_000 if you need it in seconds. "parse_rfc" Parse a string resembling an RFC 822 date. It's meant to be lenient in its parsing of dates. Hence, this will parse a wider range of dates than "parse_http()". $date_parsed = parse_rfc($date_string); arg1: $date_string ( string ) The date string can be in one of the following formats: Sun, 06 Nov 1994 08:49:37 GMT ; RFC 822, updated by RFC 1123 Sunday, 06-Nov-94 08:49:37 GMT ; RFC 850, obsoleted by RFC 1036 Sun Nov 6 08:49:37 1994 ; ANSI C's asctime() format Sun, 6 Nov 1994 08:49:37 GMT ; RFC 822, updated by RFC 1123 Sun, 06 Nov 94 08:49:37 GMT ; RFC 822 Sun, 6 Nov 94 08:49:37 GMT ; RFC 822 Sun, 06 Nov 94 08:49 GMT ; Unknown [drtr@ast.cam.ac.uk] Sun, 6 Nov 94 08:49 GMT ; Unknown [drtr@ast.cam.ac.uk] Sun, 06 Nov 94 8:49:37 GMT ; Unknown [Elm 70.85] Sun, 6 Nov 94 8:49:37 GMT ; Unknown [Elm 70.85] ret: $date_parsed ( number ) the number of microseconds since 1 Jan 1970 GMT, or 0 if out of range or if the date is invalid. since: 2.0.00 Remember to divide the return value by 1_000_000 if you need it in seconds. See Also mod_perl 2.0 documentation. Copyright mod_perl 2.0 and its core modules are copyrighted under The Apache Software License, Version 2.0. Authors The mod_perl development team and numerous contributors. perl v5.14.2 2011-02-08 libapache2-mod-perl2-2.0.7::docs::api::APR::Date(3pm)
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