Subtract Hours from a Date

Hi All,

I have a datetime field and want to subtract 24 (or any other number of)
hours from it.

How would I go about this?

Thanks

Lee

re: Subtract Hours from a Date

Lee,

What you want to do is create an instance of the TimeSpan class, and
then subtract that from your DateTime instance. You can also call the
AddDays, AddHours, etc, etc methods on the DateTime instance, passing
negative numbers to subtract the values from the DateTime. Note that these
methods return a new DateTime instance with the modified value, as opposed
to modifying the current value.

Hope this helps.


--
- Nicholas Paldino [.NET/C# MVP]
- mvp@spam.guard.caspershouse.com

"Lee" <latrotter@spamless.hotmail.com> wrote in message
news:uUmr5AKCFHA.208@TK2MSFTNGP12.phx.gbl...[color=blue]
> Hi All,
>
> I have a datetime field and want to subtract 24 (or any other number of)
> hours from it.
>
> How would I go about this?
>
> Thanks
>
> Lee
>[/color]

re: Subtract Hours from a Date

Lee <latrotter@spamless.hotmail.com> wrote:[color=blue]
> I have a datetime field and want to subtract 24 (or any other number of)
> hours from it.
>
> How would I go about this?[/color]

Use DateTime.AddHours (-24) - and don't forget that that doesn't change
the value you call it on, it just returns a new DateTime.

--
Jon Skeet - <skeet@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

re: Subtract Hours from a Date

Thanks, that was the right direction, This is the what I did to get it
working

DateTime dt =
DateTime.Now.Add(System.TimeSpan.FromHours(System. Convert.ToDouble((intHours*-1))));


"Jon Skeet [C# MVP]" <skeet@pobox.com> wrote in message
news:MPG.1c69ff3dbed68efd98bcd2@msnews.microsoft.c om...[color=blue]
> Lee <latrotter@spamless.hotmail.com> wrote:[color=green]
>> I have a datetime field and want to subtract 24 (or any other number of)
>> hours from it.
>>
>> How would I go about this?[/color]
>
> Use DateTime.AddHours (-24) - and don't forget that that doesn't change
> the value you call it on, it just returns a new DateTime.
>
> --
> Jon Skeet - <skeet@pobox.com>
> http://www.pobox.com/~skeet
> If replying to the group, please do not mail me too[/color]

re: Subtract Hours from a Date

Lee <latrotter@spamless.hotmail.com> wrote:[color=blue]
> Thanks, that was the right direction, This is the what I did to get it
> working
>
> DateTime dt =
> DateTime.Now.Add(System.TimeSpan.FromHours(System. Convert.ToDouble((i
> ntHours*-1))));[/color]

That seems a very longwinded way of doing:

DateTime dt = DateTime.Now.AddHourse (-intHours);

--
Jon Skeet - <skeet@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too