time: Reliable way to obtain start, end days of a month

[mcandre]

Hey, I noticed that the stdlib time package does not offer direct, reliable methods for obtaining the start and end days of a timestamp's month. There are a number of Stack Overflow suggestions, as well as a (reportedly inaccurate) third party package for this.

Would be good to have a standard method to call for this common use case, rather than relying on the community to get complex date and time rules right.

[ianlancetaylor]

The first day of a month seems straightforward:

    monthStart := time.Date(d.Year(), d.Month(), 1, 0, 0, 0, 0, d.Location())

and the last day of the month is only slightly more complicated:

    monthEnd := time.Date(d.Year(), d.Month() + 1, 0, 0, 0, 0, 0, d.Location())

[agnivade]

@mcandre - Does this suffice your needs or you would still prefer to have a helper for this ? IMO, this method just leverages the standard date normalization behavior and lets users get their desired output.

If you would like this to be added in standard library, some usages of this in the real world will be helpful for us to make a decision. We would need to understand why such a helper needs to be in the standard library and not exist as a third party package.

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