For Subtract 1 day use this code:
please replace your date with ‘2012-12-12‘.
echo date('Y-m-d', strtotime('-1 day', strtotime('2012-12-12')));
For Subtract 7 days use this code:
please replace your date with ‘2012-12-12‘.
echo date('Y-m-d', strtotime('-7 day', strtotime('2012-12-12')));
For Subtract 30 days use this code:
please replace your date with ‘2012-12-12‘.
echo date('Y-m-d', strtotime('-30 day', strtotime('2012-12-12')));