Year 43 BC was either a common year starting on Sunday , Monday or Tuesday or a leap year starting on Sunday or Monday ( link will display the full calendar ) of the Julian calendar ( the sources differ , see leap year error for further information ) and a common year starting on Monday of the Proleptic Julian calendar .
Year 43 BC was either a common year starting on Sunday , Monday or Tuesday or a leap year starting on Sunday or Monday of the Julian calendar .