Check if two time objects are on the same Date in Go

Question

What is the best way to compare two time.Time objects to see if they are on the same calendar day?

I looked at using t.Truncate() but it can only truncate to hours. I know I can use t.GetDate() which is straightforward but still requires more lines of code than I think should be necessary.

Answer 1

It's inefficient to parse the time for the date components three times by making separate method calls for the year, month, and day. Use a single method call for all three date components. From my benchmarks, it's nearly three times faster. For example,

import "time"

func DateEqual(date1, date2 time.Time) bool {
    y1, m1, d1 := date1.Date()
    y2, m2, d2 := date2.Date()
    return y1 == y2 && m1 == m2 && d1 == d2
}

Answer 2

if a.Day() == b.Day() && a.Month() == b.Month() && a.Year() == b.Year() {
    // same date
}