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Full Discussion: extracting date from a filename
Top Forums UNIX for Dummies Questions & Answers extracting date from a filename Post 302188358 by bakunin on Wednesday 23rd of April 2008 08:47:31 AM
Old 04-23-2008
Quote:
Originally Posted by era
This requires a version of date which can do -d "day" and +%s which -- with my luck -- probably excludes yours.
You can do date arithmetics even if the date command doesn't support it - at least on the day level - quite easily using the TZ variable (i suppose in the following example that you are in the GMT timezone. You will have to introduce a corrective factor if not.):

Code:
# print - "yesterdays date: $(TZ=GMT+24; date)"
# print - "one week ago: $(TZ=GMT+$(( 24*7 )); date)"

bakunin
 

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LEARN ABOUT MOJAVE

apr::date

install::TempContent::Objects::mod_perl-2.0.9::docs::apiUserRContributed Perinstall::TempContent::Objects::mod_perl-2.0.9::docs::api::APR::Date(3)

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 v5.18.2							    2015-06-install::TempContent::Objects::mod_perl-2.0.9::docs::api::APR::Date(3)
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