>>Depending on how you use those dates, you can store them either as numbers or as strings.
>
>I have calculations on those dates, so is the ability of storing them as numbers would still be applicable? If yes, how one would proceed to store a date under a numeric approach?

Michel,

How about using a date field + an integer field? The date field would have the current correct day and month and the integer would have the number of years to offset that date. I expect it would make your calculations a bit more complex, though.

Regards,