BirthdaysNumber Theory Level 3
Abraham, Boris and Christopher are sitting on a beach. Abraham says "My birthday was on a Monday last year and will be on a Thursday next year".
Boris says "My birthday is in January and in one year's time, my birthday will be on a Thursday and in two year's time my birthday will be on a Friday"
Christopher says "my birthday is also in January on a Wednesday this year but on a Thursday next year"
What year is it?