“The fasting period, which lasts nineteen days starting as a rule from the second of March every year and ending on the twentieth of the same month, involves complete abstention from food and drink from sunrise till sunset. It is essentially a period of meditation and prayer, of spiritual recuperation, during which the believer must strive to make the necessary readjustments in his inner life, and to refresh and reinvigorate the spiritual forces latent in his soul. Its significance and purpose are, therefore, fundamentally spiritual in character. Fasting is symbolic, and a reminder of abstinence from selfish and carnal desires.” Shoghi Effendi, Directives of the Guardian (New Delhi: Bahá’í Publishing Trust, 1973), pp. 27-28.

There are lots of sunrise/sunset calculators online, but I wrote one that takes your address and gives you just the fast times.  You can print it out in several different forms.  You can check it out here.  (It only works with US addresses for now–if I have some free time in the next week, I’ll see about Canada and Europe too.)