'Holly Ka'ba' photo (c) 2006, Camera Eye - license: https://creativecommons.org/licenses/by/2.0/

Ramadan is a month-long observance by Muslims. The Islamic calendar is a lunar calendar, so it changes in relation to the Gregorian calendar. Ramadan in 2014 will start on Saturday, June 28th and will continue for 30 days until Monday, July 28th.

You might be interested in The Best Sites To Teach & Learn About Ramadan.