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Full Discussion: Command expansion and variables
Top Forums UNIX for Dummies Questions & Answers Command expansion and variables Post 302821529 by Scott on Friday 14th of June 2013 04:07:09 PM
Old 06-14-2013
You only ran the date command once, and stored it in a (static) variable, which you then "echo'd" a few times.

If you want the date to be "up-to-date", you need to run date every time you need it.

Code:
[root@lfs1 ~]# d='$(date)'
[root@lfs1 ~]# eval echo $d
Fri Jun 14 23:58:20 CEST 2013
[root@lfs1 ~]# eval echo $d
Fri Jun 14 23:58:21 CEST 2013
[root@lfs1 ~]# eval echo $d
Fri Jun 14 23:58:23 CEST 2013

 

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LEARN ABOUT PHP

gmdate

GMDATE(3)								 1								 GMDATE(3)

gmdate - Format a GMT/UTC date/time

SYNOPSIS

       string gmdate (string  $format, [int  $timestamp = time()])

DESCRIPTION

	Identical to the date(3) function except that the time returned is Greenwich Mean Time (GMT).

PARAMETERS

	      o $format
		- The format of the outputted date string. See the formatting options for the date(3) function.

	      o $timestamp
		-  The	optional  $timestamp parameter is an integer Unix timestamp that defaults to the current local time if a $timestamp is not
		given. In other words, it defaults to the value of time(3).

RETURN VALUES

	Returns a formatted date string. If a non-numeric value is used for $timestamp, FALSE is returned and an E_WARNING level error is emitted.

CHANGELOG

       +--------+---------------------------------------------------+
       |Version |						    |
       |	|						    |
       |	|		     Description		    |
       |	|						    |
       +--------+---------------------------------------------------+
       | 5.1.0	|						    |
       |	|						    |
       |	|  The valid range of a timestamp is typically from |
       |	| Fri, 13 Dec 1901 20:45:54 GMT to Tue, 19 Jan 2038 |
       |	| 03:14:07 GMT. (These are the	dates  that  corre- |
       |	| spond  to  the  minimum  and maximum values for a |
       |	| 32-bit signed integer). However, before PHP 5.1.0 |
       |	| this	 range	 was  limited  from  01-01-1970  to |
       |	| 19-01-2038 on some systems (e.g. Windows).	    |
       |	|						    |
       | 5.1.1	|						    |
       |	|						    |
       |	|  There are useful constants of standard date/time |
       |	| formats  that  can be used to specify the $format |
       |	| parameter.					    |
       |	|						    |
       +--------+---------------------------------------------------+
EXAMPLES

       Example #1

	      gmdate(3) example

	       When run in Finland (GMT +0200), the first line below prints "Jan  01  1998  00:00:00",	while  the  second  prints  "Dec  31  1997
	      22:00:00".

	      <?php
	      echo date("M d Y H:i:s", mktime(0, 0, 0, 1, 1, 1998));
	      echo gmdate("M d Y H:i:s", mktime(0, 0, 0, 1, 1, 1998));
	      ?>

SEE ALSO

       date(3), mktime(3), gmmktime(3), strftime(3).

PHP Documentation Group 														 GMDATE(3)
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