Does Go Have a Built-in Method to Check for Daylight Saving Time?

Checking for Daylight Saving Time in Go

Determining whether the current local time is during Daylight Saving Time (DST) is a common need in programming. While some languages like Ruby provide dedicated functions for this purpose, is there a similar method in the Go standard library?

Go 1.17's Time.IsDST

With the release of Go 1.17 in August 2021, the time.Time type gained a new method called IsDST. This method returns a boolean indicating whether the time falls within a Daylight Savings Time period, based on the configured location for the time object.

Usage

To check if the current local time is during DST, you can use the following code:

<code class="go">package main

import (
    "fmt"
    "time"
)

func main() {
    now := time.Now()
    isDST := now.IsDST()
    fmt.Printf("Current local time is %s DST: %t\n", now.Format("2006-01-02 15:04:05"), isDST)
}</code>

This code will output something like:

Current local time is 2023-03-08 15:04:05 DST: true

indicating that the current time is during Daylight Saving Time.

Historical DST Information

If you need more detailed information about historical DST periods, such as the start and end dates, you can use the time.DST function, which returns a *time.DSTZone struct providing this information. However, you should note that this method is deprecated and may be removed in future versions of Go.

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