Is it proper to fast on Erev Rosh Chodesh (Yom Kippur Katan), and what are the parameters?
Synopsis
The Magen Avraham and Aruch HaShulchan record the practice of fasting on Erev Rosh Chodesh. Multiple authorities address when the fast falls when Rosh Chodesh coincides with Shabbat or Sunday, and whether one who has been fasting regularly requires hatarat nedarim to stop.
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When an individual accepts upon themselves a fast for a specified number of days, and Shabbat, Yom Tov, Rosh Chodesh, Hanukkah, Purim, or Erev Yom Kippur fall within those days, does the fast obligation apply to those special days?
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