How Can I Efficiently Calculate and Format Time Differences Between Two time.Time Objects in Go?

Calculating Time Differences with Time.Time Objects

In Golang, time discrepancies between two time.Time objects can be easily obtained using the Time.Sub() function. The result of this operation is a time.Duration value.

By default, the duration is formatted intelligently, as seen in the following example:

import (
    "fmt"
    "time"
)

func main() {
    t1 := time.Now()
    t2 := t1.Add(time.Second * 341)

    fmt.Println(t1)
    fmt.Println(t2)
    diff := t2.Sub(t1)

    fmt.Println(diff)
}

Output:

2009-11-10 23:00:00 +0000 UTC
2009-11-10 23:05:41 +0000 UTC
5m41s

For durations shorter than a day, you can use the Time.Time object constructor and the Time.Format() method to obtain the HH:mm:ss format:

out := time.Time{}.Add(diff)
fmt.Println(out.Format("15:04:05"))

Output:

00:05:41

Note that this method only applies to time differences within 24 hours. For larger differences, you may need to consider more complex solutions, as discussed in this related thread:

[golang time.Since() with months and years](https://github.com/golang/go/issues/17461)

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