So, as a catechumen, I've been strictly fasting for Lent, and we have mostly observed the Wednesday/Friday fasts for some time in our house, even prior to my inquiry and subsequent catechism, out of respect to my wife's Orthodoxy.
I've heard that technically, after either Vespers or Compline (I forget which) on a given day, that day, liturgically speaking, is over, a concept that is not new to me what with having Sat. eve masses in the RC church. In light of this, ou of curiosity, exactly when is one technically supposed to fast? After a certain hour on Tuesdays and Thursdays until a certain hour on Wed and Fri, or just rising to sleeping on Wed and Fri? I'm sure there are threads that have addressed this, but I have an awfully poor time digging anything but the simplest of subjects out of the search function!
Fasting rules apply to the Calendar day (midnight to midnight) rather than the Liturgical day (Vespers to Vespers). Perfect example: Christmas eve. A vesperal liturgy is prescribed in the evening, but the Christmas fast does not end until after the morning Liturgy on Christmas Day.