ClockSync

ClockSync


☆ ROOT is REQUIRED for automatic synchronization ☆

ClockSync synchronizes device system clock with atomic time from Internet via NTP (Network Time Protocol).
Useful if provider doesn't support NITZ, sends incorrect time or if your device/ROM has heavy clock drift.

There are 2 modes: automatic for root users and assisted manual mode for users without root (rootless mode).

Rootless mode features:
- automatic atomic time retrieval with configurable interval
- notification when offset exceeds user set threshold
- assisted manual synchronization with the hint what time/date to set
- precision between 1 and 30 seconds (because Android doesn't allow to set seconds)
- 1 second precision if your device resets seconds on Set (most Samsung and some HTC devices)
- Greenwich Time Signal assisted sync if device resets seconds

Root mode features:
- automatic sync with configurable interval
- accuracy is ~1-20ms depending on your connection and NTP server
- statistics (average drift per day, total time corrected)

Root is required because of Android security restrictions, vote for http://bit.ly/set_time_without_root if you want it to work without root, however Google has declined to fix it with the following comment:
"Hi, it is by design that applications can not change the time. There are many subtle aspects of security that can rely on the current time, such as certificate expiration, license management, etc. We do not want to allow third party applications to globally disrupt the system in this way." © some Google employee

Other features:
- customizable NTP/SNTP server and timeout
- displays current date or time since last sync
- NTP server details dialog
- 3 color schemes (dark, light, default)
- 12-hour or 24-hour clock format
- time zone detection and adjustment based on geo location
- system time zone override with custom offset
- time zone management based on latest Olson tz database (zoneinfo)
- optional haptic feedback and sync notification
- clean and easy to use interface (tap screen values or use menu)

Don't have root? See http://bit.ly/phoneroot for the detailed instructions.

Don't want or can't root your device? You can still use ClockSync as your precise time source to adjust your watch or other clocks, or to verify how accurate your cell time is, or set time manually in rootless mode.

Move to SD is disabled because automatic synchronization (timers) will not work when app is moved, also app size is very small and since not all files are moved to SD in any case, it would not save you more than 50Kb.

If you get wrong time after synchronization, your phone time zone data is out of date, use http://bit.ly/tzupdate to fix it.

Issues, questions or suggestions? Please e-mail me, developers have no way to respond to Market comments.
I reply to every e-mail within one day maximum (usually instantly).

See http://bit.ly/clocksync for more information.
Google+ Community: http://bit.ly/cs-plus

Permissions explained for paranoid users:
- RECEIVE_BOOT_COMPLETED: used only for "Sync on boot" option
- VIBRATE: optional haptic feedback on tap and sync
- INTERNET: to get time from NTP servers, to get time zone from web services
- WAKE_LOCK: to perform background synchronization without being killed in the middle by the OS
- ACCESS_NETWORK_STATE: to sync only when network is available
- ACCESS_FINE_LOCATION: to get best location for time zone from location feature when GPS is on
- ACCESS_COARSE_LOCATION: if GPS is off, network location is used
- SET_TIME_ZONE: to automatically set time zone depending on location or for manual override
- SYSTEM_ALERT_WINDOW: new permission since 1.1.5, used for transparent overlay in rootless mode to show countdown updated every second
- ACCESS_SUPERUSER: for compatibility with SuperSU and Superuser applications, see http://bit.ly/su-permission

Recent changes:
- History and Stats dialog now also shows the exact date/time of last synchronization attempt
- average drift calculation will not count synchronizations performed in less than 20 minutes interval for better accuracy
- improved average drift calculation algorithm, it's recommended that you reset the stats to get the best results
- added more diagnostics for problems with setting time (failed chmod and setCurrentTimeMillis() are recognized and reported)

And much more! See changes inside the app.
Add to list
Free
96
4.8
User ratings
40083
Installs
1,000,000+
Concerns
1
File size
208 kb
Screenshots
Screenshot of ClockSync Screenshot of ClockSync Screenshot of ClockSync Screenshot of ClockSync Screenshot of ClockSync Screenshot of ClockSync Screenshot of ClockSync Screenshot of ClockSync Screenshot of ClockSync Screenshot of ClockSync

About ClockSync
☆ ROOT is REQUIRED for automatic synchronization ☆

ClockSync synchronizes device system clock with atomic time from Internet via NTP (Network Time Protocol).
Useful if provider doesn't support NITZ, sends incorrect time or if your device/ROM has heavy clock drift.

There are 2 modes: automatic for root users and assisted manual mode for users without root (rootless mode).

Rootless mode features:
- automatic atomic time retrieval with configurable interval
- notification when offset exceeds user set threshold
- assisted manual synchronization with the hint what time/date to set
- precision between 1 and 30 seconds (because Android doesn't allow to set seconds)
- 1 second precision if your device resets seconds on Set (most Samsung and some HTC devices)
- Greenwich Time Signal assisted sync if device resets seconds

Root mode features:
- automatic sync with configurable interval
- accuracy is ~1-20ms depending on your connection and NTP server
- statistics (average drift per day, total time corrected)

Root is required because of Android security restrictions, vote for http://bit.ly/set_time_without_root if you want it to work without root, however Google has declined to fix it with the following comment:
"Hi, it is by design that applications can not change the time. There are many subtle aspects of security that can rely on the current time, such as certificate expiration, license management, etc. We do not want to allow third party applications to globally disrupt the system in this way." © some Google employee

Other features:
- customizable NTP/SNTP server and timeout
- displays current date or time since last sync
- NTP server details dialog
- 3 color schemes (dark, light, default)
- 12-hour or 24-hour clock format
- time zone detection and adjustment based on geo location
- system time zone override with custom offset
- time zone management based on latest Olson tz database (zoneinfo)
- optional haptic feedback and sync notification
- clean and easy to use interface (tap screen values or use menu)

Don't have root? See http://bit.ly/phoneroot for the detailed instructions.

Don't want or can't root your device? You can still use ClockSync as your precise time source to adjust your watch or other clocks, or to verify how accurate your cell time is, or set time manually in rootless mode.

Move to SD is disabled because automatic synchronization (timers) will not work when app is moved, also app size is very small and since not all files are moved to SD in any case, it would not save you more than 50Kb.

If you get wrong time after synchronization, your phone time zone data is out of date, use http://bit.ly/tzupdate to fix it.

Issues, questions or suggestions? Please e-mail me, developers have no way to respond to Market comments.
I reply to every e-mail within one day maximum (usually instantly).

See http://bit.ly/clocksync for more information.
Google+ Community: http://bit.ly/cs-plus

Permissions explained for paranoid users:
- RECEIVE_BOOT_COMPLETED: used only for "Sync on boot" option
- VIBRATE: optional haptic feedback on tap and sync
- INTERNET: to get time from NTP servers, to get time zone from web services
- WAKE_LOCK: to perform background synchronization without being killed in the middle by the OS
- ACCESS_NETWORK_STATE: to sync only when network is available
- ACCESS_FINE_LOCATION: to get best location for time zone from location feature when GPS is on
- ACCESS_COARSE_LOCATION: if GPS is off, network location is used
- SET_TIME_ZONE: to automatically set time zone depending on location or for manual override
- SYSTEM_ALERT_WINDOW: new permission since 1.1.5, used for transparent overlay in rootless mode to show countdown updated every second
- ACCESS_SUPERUSER: for compatibility with SuperSU and Superuser applications, see http://bit.ly/su-permission

Recent changes:
- History and Stats dialog now also shows the exact date/time of last synchronization attempt
- average drift calculation will not count synchronizations performed in less than 20 minutes interval for better accuracy
- improved average drift calculation algorithm, it's recommended that you reset the stats to get the best results
- added more diagnostics for problems with setting time (failed chmod and setCurrentTimeMillis() are recognized and reported)

And much more! See changes inside the app.

Visit Website
User reviews of ClockSync
5/2/2013. Still works great and the only clock sync i use.
Feb 5, 2013
Terrific!
Nov 11, 2012
The clock on my Desire is ALWAYS gaining by about 15sec a day, this app makes it painless to fix the problem. Excellent App.
Dec 24, 2011
Works. Great little tool.
Dec 3, 2011
Ótimo. Depois de instalar nunca mais me preocupei com o relógio do celular. Great. I instaled this app and never again worried about set up the cellphone clock.
Nov 23, 2011
Android Market Comments
A Google User
4 days ago
Awesomely precise
A Google User
5 days ago
Petar OK!
A Google User
5 days ago
Полезная программа!
A Google User
6 days ago
Good!
A Google User
Aug 15, 2014
Great for setting my watches