get unix timestamp using php

Question

Suppose i know that today's day is monday. How do i use mktime() in php to get unix timestamp for last friday and the friday before that??

suppose today's date is 17-01-2011 and its a monday. Then i want the timestamp for 14-01-2011 00:00:00 and 7-01-2011 00:00:00.

(reference) Supported Date and Time Formats and more specifically Relative Formats — Gordon
– Gordon, Commented Jan 17, 2011 at 8:50

Hannes · Accepted Answer · 2011-01-17 09:04:53Z

8

check out strtotime http://php.net/manual/en/function.strtotime.php ..solves most of that kinda issues - otherwise you must strap the date yourself

edited Jan 17, 2011 at 9:04

answered Jan 17, 2011 at 8:49

Hannes

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3 Comments

jishi Over a year ago

So, concrete example would be, strtotime('last friday') and then subtract 86400 * 7 (86400 seconds times 7 days).

Hannes Over a year ago

@jishi indeed, or really everything listed under examples at the given php.net link :D

Gordon Over a year ago

@yishi substracting hardcoded seconds from timestamps will lead to wrong results when there is DST shifts. strtotime is DST aware, so just use the relative formats as given in the link below your question.

joelcox · Accepted Answer · 2011-01-17 09:16:18Z

1

Something like this should do

<?php
    // Check if today is a Monday
    if (date('N') == 1)
    {
        // Create timestamp for today at 00:00:00
        $today = mktime('0', '0', '0', date('n'), date('j'), date('Y'));

        $last_friday = $today - 60*60*24*3;
        $last_last_friday = $today - 60*60*24*10;

        // Convert to a readable format as a check
        echo 'Last Friday\'s timestamp is ' . $last_friday . ' (' . strftime('%d-%m-%Y %H:%M:%S', $last_friday).') <br />';  
        echo 'Last last Friday\'s timestamp is ' . $last_last_friday . ' (' . strftime('%d-%m-%Y %H:%M:%S', $last_last_friday).')';  
    }

answered Jan 17, 2011 at 9:16

joelcox

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Comments

Florian Mertens · Accepted Answer · 2013-01-10 15:21:02Z

1

A lot more simpler than you thought (or even I for that matter)! Essentially, strtotime("last friday", time()) gets the timestamp of... last friday!

Getting the current timestamp first:

$unixNow = time();
echo date('r', $unixNow) . "<br />";
//Thu, 10 Jan 2013 15:14:19 +0000

Getting last friday:

$unixLastFriday = strtotime("last friday", $unixNow);
echo date('r', $unixLastFriday) . "<br />";
//Fri, 04 Jan 2013 00:00:00 +0000

Getting the friday before that:

$unixFridayBeforeThat = strtotime("last friday", $unixLastFriday);
echo date('r', $unixFridayBeforeThat) . "<br />";
//Fri, 28 Dec 2012 00:00:00 +0000

answered Jan 10, 2013 at 15:21

Florian Mertens

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