Unable to set the from year to anything before 1900

The patch in #4 has been updated to to use the lowercase "now" as the default field value so it works with the YearOnlyDefaultWidget 'now' check.

Thanks for the work here! The lack of flexibility in defining year ranges will be addressed with a different approach that should accommodate this and other issues attempting to do similar things. Please ✨ Allow flexible "from" and "to" (min/max) year ranges Needs work for details.

Credit will be granted in the other issue as appropriate. Please feel free to follow/review/contribute there.