When will my waiting period (iddah) end after the death of my husband on Sunday, Ramadan 20, 1432 AH, at 5:30 PM, and what are the obligatory things to do when it ends, specifying the day, date, and time?

The waiting period (iddah) for a woman whose husband has died, and who is not pregnant, ends on the first day of Safar 1433 AH at 5:30 PM. There are no specific acts prescribed by Islamic law for her to perform upon the completion of her iddah.