It is not known when exactly Jesus was born - not the day, or the month, or even the year! There have been several big changes made to how dates were recorded throughout history, and as a result of these confusions we now calculate that Jesus was born sometime between 7 and 4 BC ("before Christ"!).

richmondparkchurch.org.uk an evangelical pentecostal church in Boscombe, Bournemouth, Dorset, UK