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121 lines
2.9 KiB
121 lines
2.9 KiB
// Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
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//
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// This Source Code Form is subject to the terms of the MIT License.
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// If a copy of the MIT was not distributed with this file,
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// You can obtain one at https://github.com/gogf/gf.
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package gtime
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import (
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"os"
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"strings"
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"sync"
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"time"
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"github.com/gogf/gf/v2/errors/gcode"
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"github.com/gogf/gf/v2/errors/gerror"
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)
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var (
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setTimeZoneMu sync.Mutex
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setTimeZoneName string
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zoneMap = make(map[string]*time.Location)
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zoneMu sync.RWMutex
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)
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// SetTimeZone sets the time zone for current whole process.
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// The parameter `zone` is an area string specifying corresponding time zone,
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// eg: Asia/Shanghai.
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//
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// PLEASE VERY NOTE THAT:
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// 1. This should be called before package "time" import.
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// 2. This function should be called once.
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// 3. Please refer to issue: https://github.com/golang/go/issues/34814
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func SetTimeZone(zone string) (err error) {
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setTimeZoneMu.Lock()
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defer setTimeZoneMu.Unlock()
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if setTimeZoneName != "" && !strings.EqualFold(zone, setTimeZoneName) {
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return gerror.NewCodef(
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gcode.CodeInvalidOperation,
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`process timezone already set using "%s"`,
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setTimeZoneName,
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)
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}
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defer func() {
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if err == nil {
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setTimeZoneName = zone
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}
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}()
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// It is already set to time.Local.
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if strings.EqualFold(zone, time.Local.String()) {
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return
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}
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// Load zone info from specified name.
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location, err := time.LoadLocation(zone)
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if err != nil {
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err = gerror.WrapCodef(gcode.CodeInvalidParameter, err, `time.LoadLocation failed for zone "%s"`, zone)
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return err
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}
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// Update the time.Local for once.
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time.Local = location
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// Update the timezone environment for *nix systems.
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var (
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envKey = "TZ"
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envValue = location.String()
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)
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if err = os.Setenv(envKey, envValue); err != nil {
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err = gerror.WrapCodef(
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gcode.CodeUnknown,
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err,
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`set environment failed with key "%s", value "%s"`,
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envKey, envValue,
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)
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}
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return
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}
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// ToLocation converts current time to specified location.
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func (t *Time) ToLocation(location *time.Location) *Time {
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newTime := t.Clone()
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newTime.Time = newTime.Time.In(location)
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return newTime
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}
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// ToZone converts current time to specified zone like: Asia/Shanghai.
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func (t *Time) ToZone(zone string) (*Time, error) {
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if location, err := t.getLocationByZoneName(zone); err == nil {
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return t.ToLocation(location), nil
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} else {
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return nil, err
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}
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}
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func (t *Time) getLocationByZoneName(name string) (location *time.Location, err error) {
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zoneMu.RLock()
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location = zoneMap[name]
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zoneMu.RUnlock()
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if location == nil {
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location, err = time.LoadLocation(name)
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if err != nil {
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err = gerror.Wrapf(err, `time.LoadLocation failed for name "%s"`, name)
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}
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if location != nil {
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zoneMu.Lock()
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zoneMap[name] = location
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zoneMu.Unlock()
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}
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}
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return
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}
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// Local converts the time to local timezone.
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func (t *Time) Local() *Time {
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newTime := t.Clone()
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newTime.Time = newTime.Time.Local()
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return newTime
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}
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