Creating dates without all three fields, for example “1870” or “December 1902”

Hello! I was wondering if it is possible to create announcements without a month/day/year, and only doing a month/year or just year in some cases? I’m helping to create a timeline someone but they don’t know the exact dates of some of the historical events. I’m happy to pay for an add-on that does this if needed, or if it’s something that can be accomplished through some coding tweaks if you wouldn’t mind pointing me in the right direction.

Thanks so much!