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Home Backend Development Golang How to Remove the Monotonic Clock Reading from Go Timestamps?

How to Remove the Monotonic Clock Reading from Go Timestamps?

Nov 01, 2024 am 03:53 AM

How to Remove the Monotonic Clock Reading from Go Timestamps?

Stripping Monotonic Clock Readings from Go Timestamps

In Go, the time.Now() function returns a Time object containing both a wall clock reading and a monotonic clock reading. The monotonic clock reading is indicated by the "m" field in the timestamp.

Purpose of the Monotonic Clock

The monotonic clock provides a time measurement that is not subject to adjustments for clock synchronization. It is primarily used for measuring time intervals, where the absolute time is not important. For instance, it is used in measuring the duration of a function call or the time elapsed between two events.

Removing the "m" Field

If you only need the wall clock reading without the monotonic clock, there are several options:

  • Using t.Round(0): The canonical way to remove the monotonic clock reading is to use the Round() method with a duration of 0. This strips the monotonic clock reading while leaving the wall clock reading unchanged.

Example:

<code class="go">package main

import (
    "fmt"
    "time"
)

func main() {
    t := time.Now()
    fmt.Println(t)
    fmt.Println(t.Round(0))
}</code>

Output:

2009-11-10 23:00:00 +0000 UTC m=+0.000000001
2009-11-10 23:00:00 +0000 UTC
  • Using Custom Formatting: You can also use custom formatting to exclude the "m" field. For example, you can use the following format string:
"2006-01-02 15:04:05 -0700 MST"

This will print the timestamp in the specified format without the "m" field.

Note: If you require a timestamp without any clock readings, you can use the Format("") method to obtain a simple string representation of the time. This will remove both the wall clock and monotonic clock readings.

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