php - strtotime returns 1970 when I remove a month? -

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according php documentation, i'm using strtotime correctly, apparently i've managed wrong.

the following code:

echo date("y,n,j", strtotime($event["startdate"]));

outputs: 2013,4,18 (which correct)

whereas following code (using exact same data):

echo date("y,n,j", strtotime('-1 month', $event["startdate"]));

outputs: 1969,12,1 (instead of 2013,3,18)

why?

echo date("y,n,j", strtotime('-1 month', strtotime($event["startdate"])));


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