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Full Discussion: Date Comparison
Top Forums Shell Programming and Scripting Date Comparison Post 302839069 by in2nix4life on Wednesday 31st of July 2013 09:50:13 AM
Old 07-31-2013
Here's a script that will compare the dates by converting them to seconds since epoch first and them making the comparison:

Code:
#!/bin/sh
#

# define usage if we don't receive the correct
# number of arguments
if [ $# -ne 2 ]
then
    echo "Usage: ${0##*/} <date_1> <date_2>"
    exit 1
fi

# store initial date format
date1=$1
date2=$2

# convert the date format so that we can feed it
# to the date command by swapping the placement
# of the month and day
date_1=$(echo $1 | awk -F/ '{print $2"/"$1"/"$3}')
date_2=$(echo $2 | awk -F/ '{print $2"/"$1"/"$3}')

# convert the dates to seconds since epoch
date_1_seconds=$(date --date="$date_1" +%s)
date_2_seconds=$(date --date="$date_2" +%s)

# now compare the dates
if [ $date_1_seconds -gt $date_2_seconds ]
then
    echo "$date1 is greater than $date2"
else
    echo "$date2 is greater than $date1"
fi

# done
exit 0

Run it like so:

Code:
./compDate.sh

Usage: compDate.sh <date_1> <date_2>

./compDate.sh 25/04/2013 20/07/2012

25/04/2013 is greater than 20/07/2012

 

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DATETIME.SETDATE(3)							 1						       DATETIME.SETDATE(3)

DateTime::setDate - Sets the date

       Object oriented style

SYNOPSIS
public DateTime DateTime::setDate (int $year, int $month, int $day) DESCRIPTION
Procedural style DateTime date_date_set (DateTime $object, int $year, int $month, int $day) Resets the current date of the DateTime object to a different date. PARAMETERS
o $object -Procedural style only: A DateTime object returned by date_create(3). The function modifies this object. o $year - Year of the date. o $month - Month of the date. o $day - Day of the date. RETURN VALUES
Returns the DateTime object for method chaining or FALSE on failure. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.3.0 | | | | | | | Changed the return value on success from NULL to | | | DateTime. | | | | +--------+---------------------------------------------------+ EXAMPLES
Example #1 DateTime.setDate(3) example Object oriented style <?php $date = new DateTime(); $date->setDate(2001, 2, 3); echo $date->format('Y-m-d'); ?> Procedural style <?php $date = date_create(); date_date_set($date, 2001, 2, 3); echo date_format($date, 'Y-m-d'); ?> The above examples will output: 2001-02-03 Example #2 Values exceeding ranges are added to their parent values <?php $date = new DateTime(); $date->setDate(2001, 2, 28); echo $date->format('Y-m-d') . " "; $date->setDate(2001, 2, 29); echo $date->format('Y-m-d') . " "; $date->setDate(2001, 14, 3); echo $date->format('Y-m-d') . " "; ?> The above example will output: 2001-02-28 2001-03-01 2002-02-03 SEE ALSO
DateTime.setISODate(3), DateTime.setTime(3). PHP Documentation Group DATETIME.SETDATE(3)
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