Function sanitize_date
Sanitizes a date string.
DateTime fails to parse date strings that contain brackets, such as “Tue Dec 22 2015 12:52:19 GMT+0100 (West-Europa)”, which appears in PO-Revision-Date headers. Sanitization ensures such date headers are parsed correctly into DateTime instances.
| string | $date_string | The date string to sanitize. | 
| 
			DateTime
		 | Date from string if parsable, otherwise the Unix epoch. |