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I'm trying to write a Date class in an attempt to learn C++.
I'm trying to find an algorithm to add or subtract days to a date, where Day starts from 1 and Month starts from 1. It's proving to be very complex, and google doesn't turn up much,
Does anyone know of an algorithm which does this?
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For adding or subtracting Date, we use something called timedelta() function which can be found under the DateTime class. It is used to manipulate Date, and we can perform arithmetic operations on dates like adding or subtracting.
The DATE_SUB() function subtracts a time/date interval from a date and then returns the date.
The easiest way is to actually write two functions, one which converts the day to a number of days from a given start date, then another which converts back to a date. Once the date is expressed as a number of days, it's trivial to add or subtract to it.
You can find the algorithms here: http://alcor.concordia.ca/~gpkatch/gdate-algorithm.html
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