php - can't convert date from string -

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i want date's timestamp string. i'm trying:

datetime::createfromformat("y-m-d", "2015-05-18t23:45:21.604z");

but returns nothing. don't know format this.

try this,

$date = date_create_from_format('d/m/y:h:i:s', '2015-05-18t23:45:21.604z'); $date->gettimestamp();

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