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POHow to get previous day using datetime
 

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    <p>I want to set a DateTime property to previous day at 00:00:00. I don't know why DateTime.AddDays(-1) isn't working. Or why DateTime.AddTicks(-1) isn't working. First should this work?</p> <p>I have 2 objects. Each object have DateTime fields ValidFrom, ValidTo.</p> <p>EDIT: After coming home from work I tried to get the same behavior as my business objects behave. Below are the code I tried to replicate how it looks at work. Of course this is working at home but not at work. The good thing is I got good answers and +1 on all! =)</p> <pre><code>public class RuleValue { public DateTime ValidFrom, ValidTo; public RuleValue(DateTime _validFrom, DateTime _validTo) { ValidFrom = _validFrom; ValidTo = _validTo; } // oldObject.ValidFrom = 1900-01-01 // oldObject.ValidTo = 9999-12-31 // newObject.ValidFrom = 2010-03-22 // newObject.ValidTo = 9999-12-31 public void ChangeOldDate(RuleValue oldObject, RuleValue newObject) { /* * 1: When first object (oldObject) have ValidTo set to SQL-server maxdate (9999-12-12 23:59:59 etc) * I want to allow for a new object to be created * 2: oldObject timespan ValidFrom-ValidTo should not be overlapping with newObjects timespan(i have checks for that) * 3: oldObject.ValidTo should be newObject.ValidFrom - one day/or one tick */ if (oldObject.ValidTo == DateTime.MaxValue) { oldObject.ValidTo = newObject.ValidFrom.AddTicks(-1); //now works } } } class Program { static void Main(string[] args) { RuleValue rv1 = new RuleValue(DateTime.Parse("1900-01-01"), DateTime.MaxValue); RuleValue rv2 = new RuleValue(DateTime.Parse("2010-03-22"), DateTime.MaxValue); Console.WriteLine("First: "); Console.WriteLine("Old = " + rv1.ValidFrom + " - " + rv1.ValidTo); Console.WriteLine("New = " + rv2.ValidFrom + " - " + rv2.ValidTo); rv1.ChangeOldDate(rv1, rv2); Console.WriteLine("After: "); Console.WriteLine("Old = " + rv1.ValidFrom + " - " + rv1.ValidTo); Console.WriteLine("New = " + rv2.ValidFrom + " - " + rv2.ValidTo); Console.ReadKey(); } } //Output: //First: //Old = 1900-01-01 00:00:00 - 9999-12-31 23:59:59 //New = 2010-03-22 00:00:00 - 9999-12-31 23:59:59 //After: //Old = 1900-01-01 00:00:00 - 2010-03-21 23:59:59 //New = 2010-03-22 00:00:00 - 9999-12-31 23:59:59 // ALL CORRECT! :D </code></pre>
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    1. COcan we see your code for DataTime.AddDays(-1) ?
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    2. COEdited above...
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