1st Atomic Time keeps your system time accurate by synchronizing it with atomic time servers

What's new in version 3?

The next level of reliability and correctness of the atomic time synchronization

1st Atomic Time 3.0 can synchronize your clock with up to 20 milliseconds (1/50s) accuracy in SNTP mode, and up to 100 milliseconds (1/10s) in DayTime and Local server modes.

Windows Vista and Windows 7 support

1st Atomic Time fully supports time synchronization in Windows Vista, Windows Server 2008 and Windows 7. Both 32-bit and 64-bit editions are supported.

Custom time offset

You can apply a custom offset to the suggested time. If your time zone settings are incorrect, then 1st Atomic Time may suggest an incorrect time, for example one hour late, after synchronization. In previous versions of 1st Atomic Time the only possible option was to adjust only minutes and seconds. In 1st Atomic Time 3.0, that option was replaced with the customizable time offset.

Simplified time server setup

You can easily add and remove active time servers with the new and easy to use Customize Time Servers Dialog:

Local clock inaccuracy display

Atomic time synchronization now displays local clock inaccuracy, instead of a difference between suggested time and current local clock time. I.e. if 1st Atomic Time 3.0 shows inaccuracy +30 seconds, it means that local clock is 30 seconds past the correct time. Previous versions of 1st Atomic Time will display difference -30 seconds in this situation, meaning that the suggested time is 30 seconds less than the local clock time, but actually local clock will require the same correction in both cases.

And other miscellaneous changes...

What is new in version 2.1?

Option to show balloon-style tool tip near the tray icon (near the clock), when automatic synchronization is completed. This feature is available in Windows Me/2000/XP only.
You can pick several timeservers at once in the add timeserver dialog.
You can test connection not only with all servers in the list (both in Options dialog and add timeserver dialog), but with selected servers too.

What is new in version 2.0?

1st Atomic Time now can:

Synchronize time via Daytime protocol (in addition to SNTP).
Run as a server so that you can synchronize any computer in the local network with it. This local server can work on any custom port, limit allowed IPs and can log connections to it.
Work through HTTP proxy (in addition to SOCKS5). On first start, automatically configure itself to use default http proxy if defined on the given computer.
Automatically synchronize on startup and exit, and optionally wait for successful adjust before exit.
Create a log file of all operations and automatically limit its size and age. Optionally write only errors to this log file.
Check for specific dial-up entry to be established.
Skip scheduled auto-sync interval or continue to check for connection periodically on any custom period, if dial-up connection is not established.
Automatically synchronize on any custom interval, in addition to hours.
Adjust time at startup.
Warn about any custom defined difference between computer's clock and suggested new time (instead of 30 minutes).
Use any custom defined timeout setting for synchronizations.
Show error messages if cannot actually change system time after synchronization.
Accept plain IP addresses in the host name fields for both timeservers and proxies.
Automatically configure itself on first start to use system default proxy or socks server.
Resize the Options dialog.
Create desktop/start menu icons to start the program.

In addition, there are small fixes and improvements.

Back to 1st Atomic Time

Buy 1st Atomic Time Now!

Buy 1st Atomic Time now and download the full version immediately after order processing!

Try it free for 30 days!

1st Atomic Time is try-before-you-buy software. You can download a free trial version of 1st Atomic Time and try it for a test period of 30 days. After the test period you must either delete it or buy the fully functional version.