make a script that will write all the dates between say 2010 and 2018 or something, varying by the second, and let it run for a few hours.
Maybe it's a wedding date or any other special date, so 2010 may not be enough. But the date format may be a problem, I can think of many different ways to write "October 3th, 2024".
The format won't be a problem if OP still remembers it. But still, it should not be so big. There are only 1.7 billion or so values between the 1970 epoch and right now.
*Then again, I know how easy it is to forget things that I haven't written down, so I won't discount the fact that OP by now has probably forgotten everything about the password if he hasn't written it down.