- Windows 95, Internet Explorer 4.0 or higher
- Windows 98 and Windows 98 Second Edition
- Windows NT, Internet Explorer 4.0 or higher, Service Pack 4 and above
- Windows Millenium Edition
- Windows 2000 Pro, Server, Advanced Server, DataCenter
- Windows XP
- 5 megabytes of free disk space for the Atomic Time Zone program and its support files
- As much free disk space as necessary to add additional Skins and updates.
- A 166MHz Pentium class CPU or higher is recommended.
You must have an Internet connection to access the Atomic Clocks.