How to Find the Last Day of a Month using Go\'s Time Package?

How to Retrieve the Last Day of a Month in Go's Time Package

When working with time values in Go, it's often necessary to determine the last day of a month. Let's consider an example where we have a time variable representing January 29th, 2016:

<code class="go">t, _ := time.Parse("2006-01-02", "2016-01-29")</code>

How do we obtain a time value representing January 31st, the last day of the month?

Solution:

The time package provides the Date function, which constructs a time.Time value based on the provided values of year, month, day, hour, minute, second, nanosecond, and location.

To find the last day of a month, we can normalize a date representing the last day of the current month by adding one to the month value. We then use the Date function to create a time.Time value representing the last day of the desired month:

<code class="go">y, m, _ := t.Date()
lastday := time.Date(y, m+1, 0, 0, 0, 0, 0, time.UTC)</code>

In this example:

• y and m store the year and month of the current date (January).
• We add one to the month (m 1) to get February.
• We set the day to 0, which after normalization will result in the last day of January (since there are 31 days in January).
• The remaining fields are set to zero.

Calling lastday.Date() normalizes the values and returns a time.Time value representing January 31st.

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