Responsa for Moed Katan 6:12
אמר רבי יצחק כי גמירי הלכתא שלשים יום לפני ראש השנה ואתו הני תקון מפסח ומעצרת ואתנו בדידהו כל הרוצה לבטל יבוא ויבטל
But were these [termini] merely halachah [-usages]? Were they not [based on Biblical] texts? For is it not taught: [Six days thou shalt work, but on the seventh day thou shalt rest]: in ploughing time and in reaping time thou shalt rest.<span class="x" onmousemove="('comment',' Ex. XXXIV, 21.');"><sup>21</sup></span>
Teshuvot Maharam
You asked about a community that wished to declare a fast on Monday, Thursday and Monday, and the first fast day fell on Tu Bishvat. Should they be concerned and postpone the fast to the following week or not? Thus my inclination is that the fast should be postponed to the following week, and the fast should not be set because we do not find any fast on Rosh Hashanah.
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