I come across the need to compare the time and date in shell.
Here is how I did.
Convert the time to seconds
First we convert times into seconds and then compare them.
date is a command to get the current time and date,
you can specify the output format by appending
and specify the time not
now by appending
-d STRING option
date -d '2012-12-21 00:00:00` +%s
Below is the script:
#!/bin/sh doomsday=`date -d "2012-12-21" +%s` today=`date +%Y-%m-%d` today=`date -d $today +%s` if [ $doomsday -gt $today ]; then echo The world may end on December 21 2012. elif [ $doomsday -eq $today ]; then echo Today is the doomsday. What is happening now? else echo Congratulations! The world did not end on December 21 2012. fi