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Asked: 2026-05-16T04:13:51+00:00

I am using strtotime to convert a date to a unixtime stamp. Year, date

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I am using strtotime to convert a date to a unixtime stamp.
Year, date and day comes as different values to code and I am using the below code to produce the timestamp.

$year  = '1961';
$month = '2';
$day   = '15';

$date  = $year."-".$month."-".$day;

echo strtotime($date);

The above code prints : -27648000 for me. If the year is above 1970 it prints out positive results. I am still learning with the timestamp, if any one can help me out. The main aim is to convert a date to unix timestamp.

The questions is why it gives negative results, Am I coding it bad!? I am also tried mktime, but still the same result.

Thanks,
Tanmay

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1 Answer

  1. Editorial Team

    It’s to do with the Unix Epoch.

    See: date() and time()

    The valid range of a timestamp is typically from Fri, 13 Dec 1901 20:45:54 GMT to Tue, 19 Jan 2038 03:14:07 GMT. (These are the dates that correspond to the minimum and maximum values for a 32-bit signed integer). However, before PHP 5.1.0 this range was limited from 01-01-1970 to 19-01-2038 on some systems

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