Getting yesterday’s date using C# is easy. All you have to do is to use the function .AddDays to add -1 day, so it returns the date of the previous day, which is yesterday.
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How to get yesterday’s date in C#
DateTime yesterday = DateTime.Today.AddDays(-1); // Today is 09/24/2021
Output
9/23/2021 12:00:00 AM
Happy coding!