Date Parsing Modernization

[Varun Kasyap Pentamaraju]

I have been analyzing django.utils.dateparse and django.utils.timesince. Currently, developers have to write custom logic for many very common use cases.

Maybe we should add built-in support for these common cases:
Please correct me if i am wrong

1) parse_datetime relies on regex and does not support partial dates (for example, providing "2024" returns None instead of a datetime like 2024-01-01 12:00).
2) timesince forces long-form output such as "1 year, 2 months" using hard-coded joins, while modern UIs prefer compact formats like "1y 2mo" or "2w".
3) Support a customizable “Just now” threshold instead of returning "0 minutes" for small time differences.