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Date to second since 1970

 
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# 1  
Old 06-16-2008
Date to second since 1970
Hello,
I have found a piece of code which converts seconds elapsed since 1970 for an input date. Can anyone please explain a little bit the code below:

Code:
#!/bin/bash
# function to reproduce UNIX time() value
second()
{
set -- $(TZ=GMT date '+%Y %m %d')
local y=$1 m=1$2 d=1$3
((m-=103, d-=101, m<0 && (m+=12, --y)))
((d+=(m*153 + 2)/5+y*365+y/4-y/100+y/400-719468))
echo $((d*86400))
}

Last edited by Yogesh Sawant; 06-16-2008 at 02:22 AM.. Reason: added code tags
 
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LEARN ABOUT DEBIAN

apr::date

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)