Birthday Calculator Calendar Type: GregorianJulian Basing Months On : Normal Calendar Months30-day Months From the tombstone or death certificate date and age at death. Day 0 to 31 Month Year YYYY Date of death: JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember Years Months Days Aged: Born: