The muslim era dates from the hegira - arabic for nabi, the 'city of the prophet', and thus becomes known as.
Allahumma shollii wa sallim 'ala sayyidinaa Muhammad wa 'alaa aalihii wa ashhabihii ajma'iin. wat taabi'iina wa taabi'it taabiin wa man tabi'ahum bi ihsaanin ilaa yaumid diin.