I have a code:
int MonthNow = System.DateTime.Now.Month;
int YearNow = System.DateTime.Now.Year;
int DayNow = System.DateTime.Now.Day;
How
You should do it this way, if you want to get yesterday and tomorrow at 00:00:00 time:
DateTime yesterday = DateTime.Today.AddDays(-1);
DateTime tomorrow = DateTime.Today.AddDays(1); // Output example: 6. 02. 2016 00:00:00
Just bare in mind that if you do it this way:
DateTime yesterday = DateTime.Now.AddDays(-1);
DateTime tomorrow = DateTime.Now.AddDays(1); // Output example: 6. 02. 2016 18:09:23
then you will get the current time minus one day, and not yesterday at 00:00:00 time.