Atomic Clock

Contains ads
3.9
237 reviews
Content rating
Everyone
50K+
Downloads
Content rating
Everyone
Learn more
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About this app

This app displays the exact time.

Birthday countdown, daylight saving time, or the New Year's Eve countdown, it doesn't get more accurate or simple than this.

Tip: Tap the clock for a distraction-free view.

Features:

- Automatic time synchronization via NTP
- Milliseconds display
- 24-hour and AM/PM modes
- Landscape and portrait orientation support
- Adjustable display refresh rate (lower values conserve battery)
- Date display with configurable format
- Keep screen on while the app is open
- Dark, light, and system theme support
- Custom NTP server support

For best accuracy, use the app on a stable internet connection. In areas with weak connectivity, the displayed time may be slightly off.

Technical information:
The time is fetched from NTP servers and requires an internet connection. Your phone's clock serves only as a reference — the accurate time always comes directly from the NTP server.
Updated on
Apr 28, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
This app may share these data types with third parties
Location, App activity, and Device or other IDs
No data collected
Learn more about how developers declare collection
Data is encrypted in transit

Ratings and reviews

3.8
210 reviews
Don Ward
May 6, 2026
accurate - easy to read - easy to setup - use all the time as a main source of accurate time.
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FSP Apps
May 6, 2026
Thank you 😄
A Google user
January 18, 2020
Great App for when you really want to know PRECISELY what time it is, to set your watch to the exact second, for instance. Simple yet very useful.
7 people found this review helpful
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A Google user
March 25, 2020
Connecting and staying connected to server is a major issue
3 people found this review helpful
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What’s new

- Added theme setting: Dark (default), Light, System
- Added option to keep screen on
- Added configurable date format
- Added custom NTP server support
- Fixed last sync time showing device time instead of NTP-corrected time