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Drupal 6 date Project Source Code Files/Examples

These Drupal 6 date files are included here as part of our Drupal source code examples project. (Please see that project page, including our promise to donate back to the Drupal open source community.)

Drupal 6 date Project README File

This content is from the Drupal 6 date project README file:

 Once the Date API is installed, all functions in the API are available to be used 
 anywhere by any module. If the Date Timezone module is installed, the system site 
 timezone selector and the user timezone selectors are overwritten to allow the 
 selection of timezone names instead of offsets. Proper timezone conversion 
 requires knowledge of those timezone names, something that is not currently 
 available in Drupal core, and the change in selectors makes it possible to track it.
 In most cases, you should enable the Date Timezone module any time you use the
 Date API to be able to set the site and user timezone names. It is not enabled by 
 default in case another module is setting timezone names in the database.
 The API uses the PHP 5.2 date functions to create and manipulate dates, and 
 contains an option module that will emulate those functions in earlier versions
 of PHP.
 If you are using PHP 4 or PHP 5.0 or 5.1, native date handling won't work right.
 Install the Date_PHP4 module to enable wrapper functions so this code will work
 in old PHP versions. 
 Example, the following will create a date for the local value in one 
 timezone, adjust it to a different timezone, then return the offset in seconds 
 in the new timezone for the input date; The offset will be adjusted for both 
 the timezone difference and daylight savings time, if necessary:
 $date = date_create('2007-03-11 02:00:00', timezone_open('America/Chicago'));
 $chicago_time = date_format($date, 'Y-m-d H:i');
 print 'At '. $chicago_time .' in Chicago, the timezone offset in seconds 
   was '. date_offset_get($date);
 date_timezone_set($date, timezone_open('Europe/Berlin');
 $berlin_time = date_format($date, 'Y-m-d H:i');
 print 'It was '. $berlin_time .' in Berlin when it 
   was '. $chicago_time .' in Chicago.';
 print 'At that time in Berlin, the timezone offset in seconds was 
   '. date_offset_get($date);
 A helper function is available, date_make_date($string, $timezone, $type),
 where $string is a unixtimestamp, an ISO date, or a string like YYYY-MM-DD HH:MM:SS,
 $timezone is the name of the timezone this date is in, and $type is the type
 of date it is (DATE_UNIX, DATE_ISO, or DATE_DATETIME). It create and return
 a date object set to the right date and timezone.
 Simpletest tests for these functions are included in the package.
 Available functions include the following (more documentation is provided in 
 the files):
 Date PHP4 Module
 PHP 4 substitutions for the PHP 5 date functions are supplied. Use the PHP 5 
 functions in your code as they would normally be used and the PHP 4 
 alternatives will be automatically be substituted in when needed. 
 You cannot do everything with these functions that can be done in PHP 5, but 
 you can create dates, find timezone offsets, and format the results. 
 Timezone handling uses native PHP 5 functions when available and degrades 
 automatically for PHP 4 to use substitutions like those 
 provided in previous versions of the Date and Event modules.
 Read the doxygen documentation in this module for more information 
 about using the functions in ways that will work in PHP 4.
 Simpletest tests for the PHP 4 equivalent functions are included in the package.
 The following functions are emulated in PHP4:
 Preconfigured arrays
 Both translated and untranslated values are available. The date_week_days_ordered()
 function will shift an array of week day names so it starts with the site's
 first day of the week, otherwise the weekday names start with Sunday as the first
 value, the expected order for many php and sql functions.
 Miscellaneous date manipulation functions 
 Pre-defined constants and functions that will handle pre-1970 and post-2038 
 dates in both PHP 4 and PHP 5, in any OS. Dates can be converted from one 
 type to another and date parts can be extracted from any date type.
 Date calculation and navigation
 date_difference() will find the time difference between any two days, measured
 in seconds, minutes, hours, days, months, weeks, or years.
 Date regex and format helpers 
 Pre-defined constants, an array of date format strings and their 
 equivalent regex strings.
 DATE_REGEX_LOOSE is a very loose regex that will pull date parts out
 of an ISO date with or without separators, using either 'T' or a space
 to separate date and time, and with or without time.
 date_format_date() is similar to format_date(), except it takes a 
 date object instead of a timestamp as the first parameter.
 Standardized ical parser and creator 
 The iCal parser is found in date_api_ical.inc, which is not included by default. 
 Include that file if you want to use these functions:
 Complete rewrite of ical imports to parse vevents, vlocations, valarms, 
 and all kinds of timezone options and repeat rules for ical imports. 
 The function now sticks to parsing the ical into an array that can be used 
 in various ways. It no longer trys to convert timezones while parsing, 
 instead a date_ical_date_format() function is provided that can be used to 
 convert from the ical timezone to whatever timezone is desired in the 
 results. Repeat rules are parsed into an array which other modules can 
 manipulate however they like to create additional events from the results.
 Helpers for portable date SQL 
 The SQL functions are found in date_api_sql.inc, which is not included by default. 
 Include that file if you want to use these functions:
 Date forms and validators
 Reusable, configurable, self-validating FAPI date elements are found in 
 date_api_elements.inc, which is not included by default. Include it
 if you want to use these elements. To use them, create a form element
 and set the '#type' to one of the following:
   The date_select element will create a collection of form elements, with a
   separate select or textfield for each date part. The whole collection will
   get re-formatted back into a date value of the requested type during validation.
  The date_text element will create a textfield that can contain a whole
  date or any part of a date as text. The user input value will be re-formatted
  back into a date value of the requested type during validation.
  The date_timezone element will create a drop-down selector to pick a
  timezone name.
 The custom date elements require a few other pieces of information to work
 correctly, like #date_format and #date_type. See the internal documentation
 for more information.
 Date Popup Module
 A new module is included in the package that will enable a popup jQuery 
 calendar date picker and timepicker in date and time fields.
 It is implemented as a custom form element, so set '#type' to 'date_popup'
 to use this element. See the internal documentation for more information.
 Date Repeat API
 An API for repeating dates is available if installed. It can be used by 
 other modules to create a form element that will allow users to select
 repeat rules and store those selections in an iCal RRULE string, and a
 calculation function that will parse the RRULE and return an array of dates
 that match those rules. The API is implemented in the Date module as a
 new date widget if the Date Repeat API is installed.
 Install file for dependent modules
 The following code is an example of what should go in the .install file for
 any module that uses the new Date API. This is needed to be sure the system 
 is not using an earlier version of the API that didn't include all these new 
 features. Testing for version '5.2' will pick up any version on or after the 
 change to the new API.
  * Implementation of hook_requirements().
 function calendar_requirements($phase) {
   $requirements = array();
   $t = get_t();
   // This is the minimum required version for the Date API so that it will 
      work with this module.
   $required_version = 5.2;
   // Make sure the matching version of date_api is installed.
   // Use info instead of an error at install time since the problem may
   // just be that they were installed in the wrong order.
   switch ($phase) {
     case 'runtime':
       if (variable_get('date_api_version', 0) < $required_version) {
         $requirements['calendar_api_version'] = array(
           'title' => $t('Calendar requirements'),
           'value' => $t('The Calendar module requires a more current version 
              of the Date API. Please check for a newer version.'),
           'severity' => REQUIREMENT_ERROR,
      case 'install':
       if (variable_get('date_api_version', 0) < $required_version) {
         $requirements['calendar_api_version'] = array(
           'title' => $t('Calendar requirements'),
           'value' => $t('The Calendar module requires the latest version 
              of the Date API, be sure you are installing the latest versions 
              of both modules.'),
           'severity' => REQUIREMENT_INFO,
   return $requirements;
  * Implementation of hook_install().
 function calendar_install() {
   // Make sure this module loads after date_api.
   db_query("UPDATE {system} SET weight = 1 WHERE name = 'calendar'");
  * Implementation of hook_update().
 function calendar_update_5000() {
   $ret = array();
   $ret[] = update_sql("UPDATE {system} SET weight = 1 WHERE name = 'calendar'");
   return $ret;

Drupal 6 date Project Source Code Files

These are direct links to the Drupal 6 date project source code files included in this project: