Allah has decreed that Muslims use the movement of the moon to determine the passing of months and years. When the early Muslims were asked about the new moon, Allah revealed a verse saying:

يسئلونك عن الأهلة قُل هى مواقيت للناس والحج

They ask you concerning the new moons. Say; they are times appointed for (the benefit of) people, and (for) pilgrimage. (2:189)

بسم الله الرحمن الرحيم

ربي وربُك الله

رب العالمين

اللهم اهله علينا بالأمن والإيمان

والسلامة والإسلام

والمُسارعة إلى ما تُحب وترضى

اللهم بارك لنا في شهرنا هذا وارزقنا خيره وعونه

واصرف عنا ضره وشره