Here is a handy class that will help with unit testing any references to DateTime.Now.
public static class SystemTime{
public static Func<DateTime> Now = () => DateTime.Now();
public static Func<DateTime> UtcNow = () => DateTime.UtcNow();
public static Func<DateTimeOffset> OffsetNow = () => DateTimeOffset.Now;
}This is helpful when you need to test certain results from DateTime.Now. Instead of referencing DateTime.Now in your code, you would reference SystemTime.Now.
var _date = SystemTime.Now();References:
https://ardalis.com/unit-testing-time/
https://ayende.com/blog/3408/dealing-with-time-in-tests