How to Adjust the Time on Any Device: A Complete Guide
Getting the time wrong on your devices is more than a minor annoyance. It can cause calendar events to misfire, security certificates to fail, file timestamps to get scrambled, and syncing issues across apps and services. Knowing how to adjust the time — and understanding why it sometimes drifts or resets — puts you back in control regardless of what device you're using.
Why Device Time Gets Out of Sync
Most modern devices have two mechanisms for keeping time: a hardware clock (sometimes called the RTC, or Real-Time Clock) and network time synchronization. The hardware clock runs even when the device is powered off, drawing from a small battery. Network time sync pulls the correct time from an NTP server (Network Time Protocol) whenever the device connects to the internet.
When these two systems disagree — or when one fails — your displayed time goes wrong. Common causes include:
- A depleted CMOS battery on a desktop or laptop (causes the hardware clock to reset)
- Automatic time sync being disabled in settings
- Traveling across time zones without the device updating
- Manual overrides made by a previous user or an IT administrator
- A device that has been offline for extended periods
Understanding which cause applies to your situation shapes which fix actually works.
How to Adjust the Time on Windows
On Windows 10 and Windows 11, time settings live in the same place:
- Right-click the clock in the taskbar → Adjust date/time
- Or navigate to Settings → Time & Language → Date & Time
From here you have two paths:
- Set time automatically — toggle this on to let Windows sync with Microsoft's time servers. This is the default and recommended setting for most users.
- Set time manually — toggle automatic sync off first, then click Change to enter the date and time yourself.
The time zone setting is separate from the time itself. If your clock shows the right numbers but the wrong local time, the time zone is likely the culprit. You can set it automatically based on location or choose your region manually.
⏰ If your time keeps resetting after every reboot, the likely cause is a dead CMOS battery on the motherboard — a small, inexpensive coin cell (typically CR2032) that holds the hardware clock when power is cut.
How to Adjust the Time on macOS
On a Mac, go to:
System Settings (macOS Ventura and later) → General → Date & Time
On older macOS versions, this is under System Preferences → Date & Time.
You'll find the same two options: automatic sync via Apple's time servers, or a manual override. To make manual changes, you may need to click the lock icon and authenticate with your administrator password.
macOS also ties your time zone to Location Services if that's enabled, which can cause the time zone to shift if you travel or if location data is inconsistent.
How to Adjust the Time on iPhone and Android 📱
Both mobile platforms handle time similarly and generally default to automatic:
iPhone (iOS): Settings → General → Date & Time → toggle Set Automatically on or off
Android: Settings → General Management (or System) → Date and Time → toggle Automatic date and time
The exact path varies by manufacturer. Samsung, Google Pixel, and OnePlus devices each nest this slightly differently within their Settings menus, but searching "date and time" in the Settings search bar finds it quickly on any Android version.
On mobile, automatic time is almost always preferable — cellular and Wi-Fi networks provide highly accurate time signals, and many app functions (two-factor authentication, for example) depend on your clock being precisely correct.
Adjusting Time on Smart TVs, Routers, and Other Hardware
Networked devices like smart TVs, NAS drives, routers, and IoT gadgets also maintain clocks — and incorrect time on these can cause logging errors, expired certificates, and failed automations.
| Device Type | Where to Find Time Settings |
|---|---|
| Smart TV | Settings → System → Time or Clock |
| Home Router | Admin panel (usually 192.168.1.1) → Administration or System |
| NAS Drive | Web interface → Control Panel → Regional Options |
| Streaming Stick | Settings → Device → Clock or Time Zone |
Most of these support NTP sync and will stay accurate as long as they have internet access. Manual adjustment is usually only needed after a factory reset or during initial setup on an isolated network.
The Variables That Determine Your Approach
Adjusting the time sounds simple, but the right method depends on several factors that differ from user to user:
- Operating system version — menu paths and available options differ meaningfully between Windows 10 and 11, or macOS Monterey versus Ventura
- Administrator permissions — on managed work or school devices, time settings may be locked by IT policy and unavailable to change at the user level
- Network access — automatic sync requires internet connectivity; offline or air-gapped devices need manual configuration or a local NTP server
- Use case sensitivity — casual home users can tolerate minor drift, while anyone using TOTP-based two-factor authentication, operating servers, or running scheduled automations needs precise timekeeping
- Hardware age — older machines are more likely to have CMOS battery issues causing persistent resets
- Device ownership — personally owned devices give you full control; enterprise, school, or shared devices often don't
A home user on a modern laptop with internet access has a fundamentally different situation than someone managing a legacy server in an isolated environment, or a traveler whose phone keeps jumping time zones unexpectedly.
Whether automatic sync is the right answer, or whether manual control makes more sense, depends entirely on which of those variables apply to your setup.