Fix failing duration conversion

https://github.com/python-discord/bot/issues/446

The current ExpirationDate converter does not convert duration strings
to `datetime.datetime` objects correctly. To remedy the problem, I've
written a new Duration converter that uses regex matching to extract
the relevant duration units and `dateutil.relativedelta.relativedelta`
to compute a `datetime.datetime` that's the given duration in the
future.

I've left the old `ExpirationDate` converter in place for now, since
the new Duration converter may not be the most optimal method. However,
given the importance of being able to convert durations for moderation
tasks, I think it's better to implement Duration now and rethink the
approach later.

This commit closes #446

0 files changed, 0 insertions, 0 deletions