I use and recommend a hybrid system as follows:
- I ALWAYS change the capture date, even if an exact date is not known.
- Known dates – I enter the date known.
- Year only known or estimated – YYYY-01-01 and the keyword ‘year’.
- Decade only known or estimated – YYY0-01-01 and the keyword ‘decade’.
If a year is known or estimated but there are clues that allows you to date more precisely, I make a judgement based on that – such as using the date YYYY-07-01 when people are on a beach, or YYYY-04-01 for Easter photos. There are many ways you can estimate, including with clothing (sweaters vs. bathing suits) or what flowers are blooming in a garden, etc.
My clients know that a date such as YYYY-01-01 does not necessarily mean that the photo was taken on that day. For year and decade only photos, I rename the files differently also. Example: ‘YYYY-01-01 year Macintyre (001).jpg’ or ‘YYYY-01-01 decade Macintyre (001).jpg’
I hope that help!