Rosh chodesh av for hebrew year 5784 begins at sundown on sunday, 4 august 2024 and ends at nightfall on monday, 5 august 2024. 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 the day (s) on which a new month begins and is considered to be a minor. It starts the jewish month.