How to create a custom time zone in Golang?

To create a custom time zone in Golang, you can use the time.FixedZone function or the time.NewFixedZone function. The time.FixedZone function is used to modify the time zone offset, while the time.NewFixedZone function is used to modify the time zone offset and rules, such as daylight saving time.

#How to create a custom time zone in Golang?

Introduction

The Golang standard library provides a rich set of packages for working with time and dates, including the ability to create and use custom time zones. This article will guide you step-by-step on how to create your own time zone by modifying time zone offsets and rules.

Create a custom time zone

To create a custom time zone, you can use the time.FixedZone function, which requires two parameters:

• name: The name of the time zone (string)
• offset: The time zone offset from UTC (time zone offset)

Practical Case

The following example creates a custom time zone named "MyTimeZone" that is 5 hours offset from UTC:

import (
    "time"
)

// 创建一个比 UTC 偏移 5 小时的自定义时区
myTimeZone := time.FixedZone("MyTimeZone", 5*60*60) // 5 小时的秒数

// 使用时区创建 time.Time 值
t := time.Now().In(myTimeZone)
fmt.Println(t) // 输出：2023-03-08 03:04:05 MyTimeZone

Customized time zone rules

In addition to modifying the time zone offset, you can also modify time zone rules, such as daylight saving time. For this purpose, you can use the time.NewFixedZone function, which requires an additional parameter dst, which is a descriptor of daylight saving time information:

• dst.From: The date and time when daylight saving time starts
• dst.To: The date and time when daylight saving time ends
• dst.Offset : Time zone offset during daylight saving time

Practical case

The following example creates a custom time zone named "MySummerTime". There is a daylight saving time from the first Sunday in March to the first Sunday in November, offset by 6 hours from UTC:

import (
    "time"
)

// 创建一个夏令时从 3 月的第一个星期天到 11 月的第一个星期天的自定义时区
mySummerTime := time.NewFixedZone("MySummerTime", 6*60*60, &time.ZoneDST{
    From: time.Date(0, 3, 1, 0, 0, 0, 0, time.UTC),
    To:   time.Date(0, 11, 1, 0, 0, 0, 0, time.UTC),
    Offset: (7-6)*60*60, // 夏令时期间的偏移：GMT+7
})

// 使用时区创建 time.Time 值
t := time.Now().In(mySummerTime)
fmt.Println(t) // 输出：2023-03-08 04:04:05 MySummerTime

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