Sure, but no such assumption was stated by the OP.

Perhaps he thought, given the absence of year information in the sample data, the assumption was too obvious to state.

(I do assume the OP knows which years the dates are supposed to have).

I assume OPs to know their problem space. They sometimes prove me wrong, but the alternative of every SoPWer being required to fully delineate every possible constraint and nuance of their problems, would severely detract from concise and lucid questions.