บวกลบ วันที่ บน php (+/- Date from php )

echo Date("Y-m-d", strtotime("2013-01-01 +1 Month -1 Day"));// 2013-01-31

 

echo Date("Y-m-d", strtotime("2013-01-31 +1 Month -3 Day")); // 2013-02-28

 

echo Date("Y-m-d", strtotime("2013-01-31 +2 Month")); // 2013-03-31

 

echo Date("Y-m-d", strtotime("2013-01-31 +3 Month -1 Day")); // 2013-04-30

 

echo Date("Y-m-d", strtotime("2013-12-31 -1 Month -1 Day")); // 2013-11-30

 

echo Date("Y-m-d", strtotime("2013-12-31 -2 Month")); // 2013-10-31

 

echo Date("Y-m-d", strtotime("2013-12-31 -3 Month")); // 2013-10-01

 

echo Date("Y-m-d", strtotime("2013-12-31 -3 Month -1 Day")); // 2013-09-30

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