Why always when I use data Veriable in Sharepoint I must Adding o Hours to it's

Question

Why when I Adding a Data Veriable I must correct them by adding some hours to them. When I using ToUniversalTime().AddHours(2.0) i must add a two hours, and if I using ToLocalTime().AddHours(-1.0) I must minus One Hour.

Answer 1

Maybe you can use something like this:

using (SPSite site = new SPSite("siteurl"))
{
     using (SPWeb web = site.OpenWeb())
     {
          SPUser user = web.CurrentUser;
          SPRegionalSettings settings = user.RegionalSettings;
          if(settings != null){
              SPTimeZone zone = user.RegionalSettings.TimeZone;
              DateTime UTCTime = zone.LocalTimeToUTC(DateTime.Now);//Convert to UTC
              DateTime LocalTime = zone.UTCToLocalTime(UTCTime);//Convert to local time
          }
      }
  }

So to convert a value from the user's timezone, convert it to UTC with zone.LocalTimeToUTC and to convert it back, use UTCToLocalTime.

Warning: I guess this will take the regional settings of the user in SHAREPOINT, not from your computer... So if you move to another timearea, you'll still convert to regionalsettings in the previous region...

Also, I don't know how this will work with winter or summer-time...

Answer 2

Timezones vary between eachother.