The strtotime() function parses an English textual datetime into a Unix timestamps
(the number of seconds since January 1 1970 00:00:00 GMT).
Syntax of strtotime() Function
strtotime(time,now);
you can see belloe example:
<?php
//here call strtotime() to print current time
echo(strtotime("now") . "<br>");
//here call strtotime() to print next Friday
echo(strtotime("next Friday") . "<br>");
//here call strtotime() to print last Saturday
echo(strtotime("last Saturday"));
?>
output will come following:
1448590329
1449183600
1448060400
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