Start of month of Sh’vat on the Hebrew calendar. שְׁבָט (transliterated Sh’vat or Shevat) is the 11th month of the Hebrew year, has 30 days, and corresponds to January or February on the Gregorian calendar. רֹאשׁ חוֹדֶשׁ, transliterated Rosh Chodesh or Rosh Hodesh, is a minor holiday that occurs at the beginning of every month in the Hebrew calendar. It is marked by the birth of a new moon
Haftarah: Isaiah 66:1-24
https://hebcal.com/h/rosh-chodesh-shvat-2030?uc=ical-jewish-holidays-all