Re: Finding the offset of a specific time zone

Can the devices be reconfigured to use UTC instead of the local time?

-Mike

On Wed, Mar 25, 2009 at 12:59 PM, Eddie Lascu <[email protected]> wrote:

>
> Peter,
>
> Everything you said, I already figured it out and it's not helping me.
>
> Again, a time stamp coming from the field device belongs to a different
> time
> zone, so using "ToUniversalTime" will give me the wrong result because
> "ToUniversalTime" assumes the time is local which is not the case. I
> explained that the field devices and the server that runs my application
> are
> in different time zones.
>
> On the other hand, I found a class that mimics what TimeZoneInfo does in
> .NET 3.5. Incidentally, it is also called TimeZoneInfo. You can get it
> here:
>
> http://www.codeproject.com/KB/vb/TimeZoneInfo.aspx
>
> With that, I can instantiate an object of type TimeZoneInfo for Pacific
> Time
> (this would be the only parameter that I need to keep in my configuration
> file: the name of the time zone where the field devices are located).
> Having
> that object (which is built based on available time zone information from
> the subkeys of the registry's HKEY_LOCAL_MACHINE\Software\Microsoft\Windows
> NT\CurrentVersion\Time Zones key), I can ask what is the Current Time
> Offset
> and that is the offset I need to add to the values that come from the field
> devices in order to obtain the correct UTC.
>
> Thank you everyone for pitching in with your ideas.
>
> Regards,
> Eddie
>
>
>
> -----Original Message-----
> From: Discussion of advanced .NET topics.
> [mailto:[email protected]] On Behalf Of Peter Ritchie
> Sent: Wednesday, March 25, 2009 12:44 PM
> To: [email protected]
>  Subject: Re: [ADVANCED-DOTNET] Finding the offset of a specific time zone
>
> You can use DateTime.UtcNow to get the current time in UTC.  e.g.:
> DateTime utcDate = DateTime.UtcNow;
>
> You can use DateTime.ToUniversalTime() to convert a local time to UTC.
> e.g.:
> DateTime date = new DateTime(1968, 11, 05, 12,0,0); DateTime utcDate =
> date.ToUniversalTime();
>
> You can change the type of a date from local to UTC with the SpecifyKind
> method (i.e. you get a DateTime object from a database; but it's default
> kind is local and its value is actually UTC) e.g:
> DateTime dateTime = GetRecordDateFromDatabase(id); dateTime =
> dateTime.SpecifyKind(DateTimeKind.Utc);
>
> You can convert a UTC time to local time with DateTime.ToLocalTime.  E.g.:
> DateTime utcDate = GetUtcDateFromSomewhere(); DateTime localDate = utcDate
> .ToLocalTime();
>
> -- Peter
>
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-- 
Michael Levy MCPD, MCDBA
[email protected]

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