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Top Forums UNIX for Dummies Questions & Answers Display dates within a given date range Post 302281186 by jim mcnamara on Wednesday 28th of January 2009 10:24:06 AM
Old 01-28-2009
If you rearrange the order to YYYYMMDD you can use the date as a long integer.
One way to do this.
Code:
# compar reaanage and compare dates
# returns 0 if in the range 
#         -1 if below the lower bound, 
#         1 if above the upper bound
compar()
{
    echo "$1 $2 $3" |\
	awk 'function rearrange( mySTRING ){
	       return  substr(mySTRING,5) substr(mySTRING,3,2) substr(mySTRING, 1,2)
	     }
	     { one=rearrange($1)
	       two=rearrange($2)
	       three=rearrange($3)
	       if(three > one) {print 1; exit}
	       if(three < two) { print -1; exit}
	       print 0
	     } '
}

a=01312009
b=12012008
c=01012009

if [[  $(compar "$a" "$b" "$c") -eq 0 ]] ; then 
    echo "$c is in the range between $a and $b"
else
    echo "not in date range"
fi

 

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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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