Changes for version 5.2.0
- added WEEK constant
- added support for weeks "w" or "W" in relative date simple string format ($date + "1M 2W")
- added methods week_of_month(), weeks_in_year(), week_of_year()
extremely fast Date framework with timezones, microseconds, relative dates and intervals support.
Relative date object.
Timezone information object.
enable/disable date strict mode.