Improve date parsing - maybe replace chrono and/or rrule

[Cito]

Tasks is currently using chrono and rrule to parse dates and schedules in natural language.

Unfortunately, both libraries cause(d) various troubles when used in Tasks. For instance, it's currently not possible to specify the start of next month with chrono, and rrule skips dates that do not exist, e.g. a monthly task for the last day of a month could skip the next month when if does not have as many days. Solutions: We could try to fix or improve rrule and chrono. However, both seem very complicated, and already have many open issues. Another option would be to replace these libraries with something simpler/better.

Here are some libraries that should be evaluated as potential candidates.

• Sherlock
• Sugar
• date-parrot
• temporal-parse
• any-date-parser

date-parrot looks interesting because it parses both dates and schedules, but is only in an early stage. But maybe we can cooperate to make it better and include the typical use cases of Tasks.

And maybe there are other libraries that could be used? Let us know.

[claremacrae]

Brilliant idea - thank you!

[claremacrae]

Not exactly relevant to this issue, as it's about momentjs (which itself has been deprecated) but the tests in this article - and its results - could be very useful:

https://terodox.tech/migrating-away-from-momentjs-part1/