Although the traditional time to say kiddush levana is after Shabbat, you may say kiddush levana from the third day (three periods of 24 hours) after the molad until 14 days and 18 hours after the molad. Ideal is after seven 24-hour periods. On the evening of a Jewish festival.

Can you say Kiddush Levana inside?

If one cannot stand up at all, Kiddush Levana may still be said sitting down. The Rama (OC 426:4) writes that Kiddush Levana should not be said when standing under a roof or awning, but rather should be recited directly under the sky.

When can you say Birkat HaLevana?

The Shulchan Aruch (O.C. 426:4) rules that one should not recite Birkat HaLevana until seven days from the molad (birth of the new moon) have passed.