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Atomic time for your PC

ATOMiT - PC Atomic clock

ATOMiT - PC Atomic clock


Program features

Version: 2.1 FREEWARE
Release date: 15.Dec.2008

Operation system: Windows 9x, ME, 2000, 2003, XP, Vista

  • Windows Systemtime Synchronization via Internet-Atomic-Clock. Calling one of over 120 NTP-Timeservers using the SNTP Protocol on Port 123.
  • ATOMiT waits for an Internet connection and tries every 3 minutes to connect to your given time server.
  • ATOMiT ends until synchronization was successful.
  • Setup creates an Autostart-shortcut to start ATOMiT on every PC-Startup.
  • Placed as an icon in your Windows-Taskbar. A right mouse click will open the context menue and lets you change the program settings (options).
  • External timeserver file timesrv.txt contains over 120 timeserver entries, is editable, and must be in the same directory like ATOMiT.
  • New since v2.1: Play sound after successful time synchronization.


Download ATOMiT v2.1 (560KB)
ATOMiT contains no Spyware, Malware or somethingelse



Support the further development of ATOMiT with any amount you like via Paypal


Timeserver-Entries in timesrv.txt

The following line shows you one typical Timeserver-Entry in file timesrv.txt:

US | | National Center for Atmospheric Research, Boulder, Colorado

  • "US" Countrycode, in this example: the United States
  • "|" Delimeter between the 3 Data Fields. (ASCII-Character 124, decimal)
  • "" Timeserver URL. Without "http://www" and without a trailing "/"
  • "|" Delimeter between the 3 Data Fields. (ASCII-Character 124, decimal)
  • "National..." Description of the timeserver location. In this example: Boulder, US-State Colorado


User's Guide

After the installation of the setup file setup.exe was successful, you can execute ATOMiT which shows during his first start an option form (see below). Otherwise ATOMiT will be placed as an icon icon in your Windows-Taskbar.


A right mouse click will open the context menue and lets you change the program settings (option) like timeserver and message settings:


  • Language (german/english)
  • Use Sync Info to let ATOMiT show a text message, or to play a sound after a successful time synchronization.
  • SNTP-Timeserver. Please choose a timeserver in your country/timezone. Tip: if ATOMiT can't connect after a few minutes, try another timeserver.
  • Click the button Test to test your SNTP-Timeserver. This test is an immediate attempt to synchronize the time - without waiting 3 minutes.
  • Click the button Save to save your current settings and to minimize the option form. After circa 3 minutes ATOMiT automatically connects to your timeserver (active Internet connection is required) and synchronized the Windows system time.



  • DAYTIME, the daytime protocol (RFC-867). The time server is listening on TCP/UDP port 13 and sends an ASCII string (one line, no format defined). Although NIST is sending some additional information, there is no time zone or correction information here.
  • TIME, the time protocol (RFC-868). The time server is listening on TCP/UDP port 37 and sends a 32-bit binary number (seconds since 1900-01-01 00:00.00 UTC). This base will serve until time stamp 4294967295, which will be on 2036-02-07 06:28.14 UTC. The standardized data format refers to UTC (Coordinated Universal Time), no other time zones. This protocol cannot estimate network delays or report additional information. Time stamp on 1970-01-01 00:00.00 UTC was 2208988800.
  • NTP, the network time protocol V3 (RFC-1305). The time server is listening on UDP port 123. NTP is a very sophisticated protocol between NTP servers and multiple peers, using unicast and multicast addressing. NTP timestamps are represented as a 64-bit unsigned fixed-point number, in seconds since 1900-01-01 00:00.00 UTC. The integer part is in the first 32 bits and the fraction part of the second is in the last 32 bits. The maxmimum number is 4294967295 seconds with a precision of about 200 picoseconds.
  • SNTP, the simple network time protocol V4 (RFC-2030). The time server is listening on UDP port 123. SNTP formats are compatible to the NTP protocol specification, using a simplified access strategy for servers and clients; the access paradigm is identical to the UDP/TIME protocol.
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