How to get 29 Feb using AddYears method in c#

Question

We use a job which runs every day and perform some action for a day one year ahead. Actually we just use something like: DateTime.UtcNow.AddYears(1). But it seems not possible to get a 29 February(e.g for 2020) using this technique:

var target = new DateTime(2020, 2, 29);
bool result = (target == target.AddYears(-1).AddYears(1));//false

So is it possible to target a 29 February in future somehow?

Answer 1

No. The Documentation states:

• If value + DateTime.Year is also a leap year, the return value represents the leap day in that year. For example, if four years is added to February 29, 2012, the date returned is February 29, 2016.

• If value + DateTime.Year is not a leap year, the return value represents the day before the leap day in that year. For example, if one year is added to February 29, 2012, the date returned is February 28, 2013.

This means if you add a year you will always get Feb 28th. The only way to get 29th via AddYears is if you add a multiple of 4.