The Leap-years has not been in mind

[ehooo]

Hi, i think could be a problem in the Lead-years

https://github.com/seatgeek/businesstime/blob/master/businesstime/holidays/__init__.py#L9

[erwaller]

Yeah, that's definitely a known issue. Fortunately, it only affects holidays defined using the -week specification (which is used for holidays like Memorial Day which are defined by their relation to the end of the month) in February. I'm not aware of any holiday that matches that description yet so I've been thinking of this as relatively low priority.