TimeSpan to DateTime conversion

Question

I want to convert a Timespan to Datetime  How can I do this   I found one method on Google   DateTime dt  TimeSpan ts  XXX      We can covnert  ts  to  dt  like this   dt  Convert ToDateTime ts ToString       Is there any other way to do this

User · Answer

A problem with all of the above is that the conversion returns the incorrect number of days as specified in the TimeSpan.
Using the above, the below returns 3 and not 2.

Ideas on how to preserve the 2 days in the TimeSpan arguments and return them as the DateTime day?

public void should_return_totaldays()
{
    _ts = new TimeSpan(2, 1, 30, 10);
    var format = "dd";
    var returnedVal = _ts.ToString(format);
    Assert.That(returnedVal, Is.EqualTo("2")); //returns 3 not 2
}

User · Answer

While the selected answer is strictly correct  I believe I understand what the OP is trying to get at here as I had a similar issue   I had a TimeSpan which I wished to display in a grid control  as just hh mm  but the grid didn t appear to understand TimeSpan  only DateTime    The OP has a similar scenario where only the TimeSpan is the relevant part but didn t consider the necessity of adding the DateTime reference point   So  as indicated above  I simply added DateTime MinValue  though any date will do  which is subsequently ignored by the grid when it renders the timespan as a time portion of the resulting date

User · Answer

You could also use DateTime FromFileTime finishTime  where finishTme is a long containing the ticks of a time  Or FromFileTimeUtc

User · Answer

First  convert the timespan to a string  then to DateTime  then back to a string   Convert ToDateTime timespan SelectedTime ToString    ToShortTimeString

User · Answer

It is not very logical to convert TimeSpan to DateTime  Try to understand what leppie said above  TimeSpan is a duration say 6 Days 5 Hours 40 minutes  It is not a Date  If I say 6 Days  Can you deduce a Date from it  The answer is NO unless you have a REFERENCE Date    So if you want to convert TimeSpan to DateTime you need a reference date  6 Days  amp  5 Hours from when  So you can write something like this    DateTime dt   new DateTime 2012  01  01    TimeSpan ts   new TimeSpan 1  0  0  0  0    dt   dt   ts

User · Answer

If you only need to show time value in a datagrid or label similar  best way is convert directly time in datetime datatype   SELECT CONVERT datetime myTimeField  as myTimeField FROM Table1

User · Answer

var StartTime   new DateTime item StartTime Ticks

User · Answer

TimeSpan can be added to a fresh DateTime to achieve this   TimeSpan ts  XXX   DateTime dt   new DateTime     ts    But as mentioned before  it is not strictly logical without a valid start date  I have encountered a use-case where i required only the time aspect  will work fine as long as the logic is correct

User · Answer

An easy method  use ticks   new DateTime  DateTime Now - DateTime Now AddHours -1 55   Ticks  ToString  HH mm ss fff     This function will give you a date  Without Day   Month   Year

User · Answer

You need a reference date for this to be useful   An example from      http   msdn microsoft com en-us library system datetime add aspx     Calculate what day of the week is 36 days from this instant    System DateTime today   System DateTime Now    System TimeSpan duration   new System TimeSpan 36  0  0  0     System DateTime answer   today Add duration     System Console WriteLine   0 dddd    answer

[c#] TimeSpan to DateTime conversion

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