Timeanddate.com and SunriseSunset.com both offer charts to determine daylight time periods for locations across the world. The website of the U.S. Naval Observatory, aa.usno.navy.mil, provides a way to obtain a table of the duration of daylight or darkness for any year between 1700 and 2100 for any location worldwide.
Timeanddate.com has a database of locations around the world, each with detailed information on the day and night cycles of the location through a large range of dates. Some of the data offered by timeanddate.com includes day and night maps of the world, sunrise and sunset times, and information on upcoming solstices and equinoxes.