Fixed wrong behavior of dateAt(.startOfMonth)

[makesource]

Thank you for your great library 😀
Any suggestions and thoughts will be appreciated :)

I think it's odd that two similar helper functions have different results.
For example

Date("2019-10-03 15:32:15", format: "yyyy-MM-dd HH:mm:ss").dateAt(.startOfMonth) // 2019-10-01 01:01:01 
Date("2019-10-03 15:32:15", format: "yyyy-MM-dd HH:mm:ss").dateAtStartOf(.month) // 2019-10-01 00:00:00 

We can not define the exact moments of endOfDay, endOfWeek, endOfMonth (depending on the minimum time unit you set).
However, it's so clear that startOfDay, startOfWeek, startOfMonth represent certain point in time which is yyyy-MM-dd 00:00:00.

So that's why dateAt(.startOfMonth), dateAtStartOf(.month)should have same results.
(and it's already same in .startOfDay, .startOfWeek)

[LabLamb]

I would've been stuck for a long time if it weren't for this issue ticket