Google estimates a page date based on features of the page such as dates in the title and URL. (Ref
Example of recognized date by Google (Ref)
| Date Format | Example Date |
|---|---|
| YYYY-MM-DD | 2009-12-31 |
| YYYY/MM/DD | 2009/12/31 |
| YYYYMMDD | 20091231 |
| Month DD YYYY | December 31 2009 |
| DD Month YYYY | 31 December 2009 |