按照设计，您的 iPhone 会自动结合使用 GPS 和蜂窝服务(combination of GPS and cellular services)来显示正确的日期和时间。如果您经常旅行或居住在夏令时 ( DST(DST) )的地区，这将非常方便。但也可以根据需要手动调整 iOS 设备上的日期和时间。
可能是因为您的设备上显示的时间不准确（这种情况会发生，但很少发生）。或者，也许你想提前几分钟来欺骗自己守时(trick yourself into staying punctual)。无论如何(Regardless)，以下说明将向您展示如何手动更改 iPhone 上的日期和时间。
如何手动更改 iPhone 的(Time Manually)日期(Date)和时间
您可以通过进入设置(Settings)应用程序的日期(Date)和时间(Time)管理屏幕来手动更改 iPhone 上的日期、时间和时区。
1. 打开 iPhone 上的设置(Settings )应用程序。
2. 向下滚动并点击常规(General)。
3. 点击日期和时间(Date & Time)。
4. 关闭自动设置(Set Automatically)旁边的开关。
注意：(Note:)如果“自动设置”显示为灰色，请跳至下一部分以了解解决方法。
5. 点击时区(Time Zone)搜索并切换到不同的时区。此外，点击当前日期和时间(current date and time)并使用日期选择器和时间滚轮对两者进行手动调整。
警告：(Warning:)设置偏离所选时区的日期和时间可能会导致某些应用程序和服务出现故障。
在 iPhone 上完成更改日期和时间后，点击左上角的通用(General )以退出日期(Date)和时间(Time)屏幕。
“自动设置”切换显示为灰色？尝试这些修复
如果“自动设置”切换显示为灰色并锁定在 iPhone 上的日期(Date)和时间(Time)设置中，则除非您想办法将其关闭，否则您无法进行任何手动更改。按照以下建议进行操作，您应该能够做到。
删除屏幕时间密码(Remove Screen Time Passcode)
您的 iPhone 具有称为“屏幕使用时间”(Screen Time)的内置功能，可帮助您施加应用限制并监控设备使用情况。但是，如果您已经使用密码（称为屏幕时间(Screen Time)密码）激活并保护它，则可能会强制设备将“自动设置”开关锁定到位。解决这个问题的唯一方法是关闭屏幕时间(Screen Time)密码。
1. 打开 iPhone 的设置(Settings )应用程序。
2. 选择屏幕时间(Screen Time)。
3. 向下滚动并点击更改屏幕时间密码(Change Screen Time Passcode)。
4. 点击关闭屏幕时间密码(Turn Off Screen Time Passcode)。
5. 输入您的屏幕时间(Time)密码以验证您的操作。
注意：(Note:)如果您忘记了屏幕时间(Time)密码，请点击忘记密码？(Forgot Passcode?)使用您的Apple ID凭据重置它。
6. 返回设置(Settings )>常规(General )>日期和时间(Date & Time)。自动设置(Set Automatically)旁边的开关现在应该可能处于活动状态。如果是这样，请将其关闭并进行调整。完成后，您始终可以设置新密码。
禁用屏幕时间(Disable Screen Time)
如果关闭屏幕时间(Time)密码没有帮助，请尝试完全禁用屏幕(Screen) 时间(Time)。您可以相对较快地做到这一点。
1. 打开设置(Settings )应用程序并点击屏幕时间(Screen Time)。
2. 向下滚动并点击关闭屏幕使用时间(Turn Off Screen Time)。
3. 再次点击关闭屏幕时间(Turn Off Screen Time)进行确认。
(Feel)更改 iPhone 上的日期和时间后，请随时重新设置屏幕使用时间。(Time)
禁用定位服务(Disable Location Services)
您的 iPhone 部分依赖GPS来自动设置时间。除非您停用设备定位(Location) 服务(Services)中的相应设置，否则这可能会将“自动设置”开关锁定到位。
1. 打开设置(Settings )应用程序并点击隐私(Privacy)。
2. 点击定位服务(Location Services)。然后，向下滚动并点击系统服务(System Services)。
3. 关闭设置时区(Setting Time Zone)旁边的开关。
如果您仍然无法与“自动设置”切换进行交互，请继续进行其余修复。
重启你的 iPhone(Restart Your iPhone)
有时，由于系统软件中的故障，“自动设置”开关可能会变暗。重启你的 iPhone 可能会解决这个问题。
1. 打开设置(Settings )应用程序并点击常规(General )>关机(Shut Down)。
2. 向右拖动电源(Power )图标以关闭 iPhone。
3. 等待至少 30 秒并按住侧边( Side )按钮重新启动设备。
更新运营商设置(Update Carrier Settings)
您的运营商可能会限制您更改 iPhone 上的时间设置。如果是这样，您将无能为力。但是您可以检查是否有待处理的运营商设置更新，该更新可以激活手动设置时间的功能。这是一个很长的镜头，但仍然值得一试。
1. 打开设置(Settings )并转到常规(General )>关于(About)。
2. 等待至少 30 秒。
3. 如果您同时收到运营商设置更新(Carrier Settings Update)提示，请点击更新(Update)。
更新系统软件(Update the System Software)
为您的 iPhone 应用最新的系统软件更新可以修复任何导致“自动设置”开关变暗的已知错误。
1. 打开设置(Settings )应用程序并转到常规(General )>软件更新。(Software Update.)
2. 等待您的 iPhone 完成扫描新更新。
3. 点击下载并安装(Download & Install)将 iOS 更新到最新版本。
重置所有设置(Reset All Settings)
如果上述修复均未失败，请尝试重置 iPhone 上的所有设置。这可能有助于解决灰色的“自动设置(Set Automatically)”开关背后的任何潜在问题。
1. 打开设置(Settings )并转到常规(General )>重置(Reset)。
2. 点击重置所有设置(Reset All Settings)。
3. 输入您的设备密码并再次点击重置所有设置(Reset All Settings)进行确认。
重置过程后，访问日期(Date)和时间(Time)窗格并检查是否可以手动进行任何调整。你很可能应该能够做到这一点。但是，您还必须重新连接到任何 Wi-Fi 网络，并从头开始重新配置您的设备首选项。
记得(Remember)进行任何定期调整
手动更改 iPhone 上的时间很好，但您必须记住根据您的时区进行任何定期调整。如果您开始遇到任何应用程序或服务的问题，您应该回退到允许设备本身自动设置时间或尽力自己重新更正。
说到时间，试试这些很酷的主屏幕时钟小部件(cool Home Screen clock widgets)。
How to Manually Change the Date and Time on iPhone
By design, your iPhone automatically uses a combination of GPS and cellular services to display the correct date and time. That’s very convenient if you tend to travel a lot or live in a region with daylight savings (DST). But it’s also possible to manually adjust both the date and time on an iOS device should you want.
Maybe it’s because the time shows up inaccurately on your device (which happens, but rarely). Or perhaps you want to advance the clock by a few minutes to trick yourself into staying punctual. Regardless, the following instructions will show you how to manually change the date and time on the iPhone.
How to Change the iPhone’s Date & Time Manually
You can manually change the date, time, and time zone on your iPhone by diving into the Settings app’s Date & Time management screen.
1. Open the Settings app on your iPhone.
2. Scroll down and tap General.
3. Tap Date & Time.
4. Turn off the switch next to Set Automatically.
Note: If “Set Automatically” appears grayed out, skip ahead to the next section for ways to fix that.
5. Tap Time Zone to search for and switch to a different time zone. Additionally, tap the current date and time and use the date picker and the time scroll wheel to make manual adjustments to both.
Warning: Setting a date and time that deviates from the selected time zone may cause some apps and services to malfunction.
Once you’ve finished changing the date and time on the iPhone, tap General to the top-left to exit the Date & Time screen.
“Set Automatically” Toggle Appears Grayed Out? Try These Fixes
If the “Set Automatically” toggle appears grayed out and locked within the Date & Time settings on your iPhone, you can’t make any manual changes unless you figure out a way to turn it off. Work your way through the suggestions below, and you should be able to do that.
Remove Screen Time Passcode
Your iPhone comes with built-in functionality called Screen Time to help you impose app restrictions and monitor device usage. However, if you’ve already activated and secured it with a passcode (called the Screen Time passcode), that may force the device to lock the “Set Automatically” switch in place. The only way to sort that out is to turn off the Screen Time passcode.
1. Open the iPhone’s Settings app.
2. Select Screen Time.
3. Scroll down and tap Change Screen Time Passcode.
4. Tap Turn Off Screen Time Passcode.
5. Enter your Screen Time passcode to authenticate your action.
Note: If you can’t remember your Screen Time passcode, tap Forgot Passcode? to reset it using your Apple ID credentials.
6. Head back to Settings > General > Date & Time. The switch next to Set Automatically should likely be active now. If so, turn it off and make your adjustments. You can always set up a new passcode after you’ve finished doing that.
Disable Screen Time
If turning off the Screen Time passcode didn’t help, try disabling Screen Time completely. You can do that relatively quickly.
1. Open the Settings app and tap Screen Time.
2. Scroll down and tap Turn Off Screen Time.
3. Tap Turn Off Screen Time again to confirm.
Feel free to set up Screen Time again after you’ve finished changing the date and time on your iPhone.
Disable Location Services
Your iPhone relies partially on GPS to set the time automatically. That could lock the “Set Automatically” switch in place unless you deactivate the corresponding setting within the device’s Location Services.
1. Open the Settings app and tap Privacy.
2. Tap Location Services. Then, scroll down and tap System Services.
3. Turn off the switch next to Setting Time Zone.
If you still can’t interact with the “Set Automatically” toggle, move on with the rest of the fixes.
Restart Your iPhone
Sometimes, the “Set Automatically” switch can appear dimmed due to a glitch within the system software. Restarting your iPhone may fix that.
1. Open the Settings app and tap General > Shut Down.
2. Drag the Power icon to the right to turn off the iPhone.
3. Wait for at least 30 seconds and hold down the Side button to reboot the device.
Update Carrier Settings
Your carrier might be restricting you from changing the time settings on your iPhone. If so, you can’t do anything about it. But you can check if you’ve got a pending carrier settings update that could activate the ability to set the time manually. It’s a long shot but still worth an attempt.
1. Open Settings and go to General > About.
2. Wait for at least 30 seconds.
3. If you receive a Carrier Settings Update prompt in the meantime, tap Update.
Update the System Software
Applying the latest system software updates for your iPhone can fix any known bugs causing the “Set Automatically” switch to appear dimmed.
1. Open the Settings app and go to General > Software Update.
2. Wait for your iPhone to finish scanning for new updates.
3. Tap Download & Install to update iOS to its latest version.
Reset All Settings
If none of the fixes above failed, try resetting all settings on your iPhone. That could help patch out any underlying issues behind the grayed-out “Set Automatically” switch.
1. Open Settings and go to General > Reset.
2. Tap Reset All Settings.
3. Enter your device passcode and tap Reset All Settings again to confirm.
After the reset procedure, visit the Date & Time pane and check if you can make any adjustments manually. You most likely should be able to do that. However, you must also re-connect to any Wi-Fi networks and re-configure your device preferences from scratch all over again.
Remember to Make Any Periodic Adjustments
Manually changing the time on your iPhone is fine, but you do have to remember to make any periodic adjustments depending on your time zone. If you start encountering issues with any apps or services, you should fall back to allowing the device itself to set the time automatically or try your best to re-correct it yourself.
Speaking of time, try out these cool Home Screen clock widgets.
