API Services From Timeanddate.com

API & XML data streams from timeanddate.com supply accurate and reliable information on current local times, time zones, public holidays and observances worldwide, daylight saving time (DST), international calling codes, rise/set times for sun and moon.

Use this API Services to tap into timeanddate.com's database and integrate their data into your applications. All data can be used directly with online or internal applications, or imported to calendars. The API & XML services can also be combined with IP look-up (geolocation) services.

A free test accounts is available to give you an idea of how this services work.
More information: http://www.timeanddate.com/services/api/