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datetime – PHP timestamp – first day of the week

Posted by: admin July 12, 2020 Leave a comment

Questions:

Need to find the timestamp for the first minute of the first day of the current week.

What is the best way to do this?

<?php

$ts = mktime(); // this is current timestamp

?>
How to&Answers:

If Monday is your first day:

$ts = mktime(0, 0, 0, date("n"), date("j") - date("N") + 1);

Answer:

If you think Monday is the first day of the current week…

$ts = strtotime('Last Monday', time());

If you think Sunday is the first day of the current week…

$ts = strtotime('Last Sunday', time());

Answer:

If it is the monday you’re looking for:

$monday = new DateTime('this monday');
echo $monday->format('Y/m/d');

If it is the sunday:

new DateTime('this sunday'); // or 'last sunday'

For further information about these relative formats, look here “PHP: Relative Formats

Answer:

First of all, date/time functions in PHP are really slow. So I try to call them a little as possible. You can accomplish this using the getdate() function.

Here’s a flexible solution:

/**
 * Gets the timestamp of the beginning of the week.
 *
 * @param integer $time           A UNIX timestamp within the week in question;
 *                                defaults to now.
 * @param integer $firstDayOfWeek The day that you consider to be the first day
 *                                of the week, 0 (for Sunday) through 6 (for
 *                                Saturday); default: 0.
 *
 * @return integer A UNIX timestamp representing the beginning of the week.
 */
function beginningOfWeek($time=null, $firstDayOfWeek=0)
{
    if ($time === null) {
        $date = getdate();
    } else {
        $date = getdate($time);
    }

    return $date[0]
        - ($date['wday'] * 86400)
        + ($firstDayOfWeek * 86400)
        - ($date['hours'] * 3600)
        - ($date['minutes'] * 60)
        - $date['seconds'];

}//end beginningOfWeek()

Answer:

I use the following snippet of code:

public static function getTimesWeek($timestamp) {

  $infos = getdate($timestamp);
  $infos["wday"] -= 1;
  if($infos["wday"] == -1) {
    $infos["wday"] = 6;
  }

  return mktime(0, 0, 0, $infos["mon"], $infos["mday"] - $infos["wday"], $infos["year"]);
}

Answer:

Use this to get timestamp of which weekday you want, instead ‘Saturday’ write first day of the week:

strtotime('Last Saturday',mktime(0,0,0, date('m'), date('d')+1, date('y')))

for example: in above code you get timestamp of last saturday, instead of this week’s saturday.

note that, if the weekday is Saturday now, this will return today time stamp.