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PHP gets 00:00:00 unix timestamp

If I got unix time like

1407050129

How to get 12:00 AM of this unix day in unix timestamp means the first minute of the day of this unix time.

Example, if I want to get the first minute today

$today_first_min = strtotime("00:00:00");
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Try the following:

$that_day = "1407050129";

$that_day_first_min = strtotime(date('Y-m-d', $that_day) . ' midnight');


See demo

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An alternative method to get the same result ... Unix time is the number of seconds since 1970-01-01 00:00:00 UTC, so every whole day is a multiple of (60 * 60 * 24) seconds.

Using this fact, you can use the modulus (%) to calculate and then remove the remainder (i.e. seconds, hours, and minutes) from the day and go back to the first hours!



date_default_timezone_set('UTC');

$that_date  = 1407050129;
$first_hour = $that_date - ($that_date % (60*60*24));

print date('Y-m-d H:i:s', strval($first_hour));  

// 2014-08-03 00:00:00
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