PTBSync is a tool to synchronize your PC time with an an atomic clock via the Internet. It offers 65 Time servers (NTP) worldwide to choose from. It can run as a service on NT / 2000 / XP and offers support for DSL, international UTC time, and much more. It also includes a complete personal organizer for reminders and repetitive events such as birthdays, anniversaries, etc. It lets you create multiple recurring reminders or events, launch a file with optional at alarm time as well as popup messages before and after the event. If multiple users share the same PC, each one can have his own date entries. Additional features include support for holidays, complex date scheduling an more, export to HTML, alarm sounds, support for daylight savings time, date display in the system tray, and more.