date

PHP, strtotime and weeks over new year problems

Having problems with navigating over new year with weeks and think it's a bug? You are not alone, a friend of mine also thought so :-) There is a problem how to deal with starting days of week, Sunday or Monday causing the problem.

Problem: based on a date adding a week or 7 days (+1 week or +7 days) causing "20121224 +1week" end up on "20121231" if you set "Ymd" but if you go for "YW" you get "201201". If you instead use the ISO year "o" you will get the right year.

Workaround warnings like "It is not safe to rely on the system's timezone settings..." using strtotime() and date()

When running cron.php from CLI you might get a warning like "It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Berlin' for 'CEST/2.0/DST' instead ..."

Best solution is to set the time zone in the CLI version of php.ini, suggested in http://drupal.org/node/615438#comment-2195208

Add a monthly datepicker with jQuery - separate script

This script adds a month-year picker to a text field, and works better than a modification of jQuery datepicker.

<?php
drupal_add_js(drupal_get_path('module', 'jquery_ui') .'/jquery.ui/ui/jquery.mtz.monthpicker.js');

$sub_script = "$(document).ready(function () {
         $('.add-datepicker-y-m').monthpicker({
            'pattern': 'mm/yyyy'
          })
        }); ";

drupal_add_js($script, 'inline', 'footer');
?>

Source: https://github.com/lucianocosta/jquery.mtz.monthpicker

Add a monthly datepicker with jQuery - modification

This is how you can add a monthly datepicker modification in jQuery in Drupal and use numeric date format like yyyymm.

This version uses the format of yyyymm e.g. '201112' for Dec 2011

Get week starting and ending date in PHP

This is how you can get the week starting date or ending date by giving a week number and the year.

A date diff function for PHP before version 5.3.0

Before PHP 5.3.0 there were no date_diff(), then this function can be useful. It returns the difference in days, and you can modify it so it returns hours and seconds as a string i have borrowed it from http://php.net/manual/en/function.date-diff.php. I might some day clean up this function.

Some PHP Date and time classic code applications

PHP Date and some classic code applications

First day of week
$first_day_of_week = mktime(0, 0, 0, date('m'), date('d')-date('N')+1, date('Y')); echo date('Y-m-d H:i:s', $first_day_of_week); //Depending on server settings and location date('N') can be changed to date('w') depending on Monday or Sunday is considered to be the first day of week.

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