Get UTC offset in WP7

问题

Does anyone know the best way to get the UTC offset in WP7? Apparently the TimeZone api hasn't been implemented there.

Thanks

回答1:

Just use DateTimeOffset.Now.Offset... that is why DateTimeOffset was created!

回答2:

If you just want to convert to local time, use DateTime.ToLocalTime(). If you want the offset, I think you can subtract the original value. Documentation.

回答3:

I recently did something like the below; this was done quickly but it works. In my case I always wanted time as of eastern time zone since that is where the event my app was for. Stored as UTC and calculated offset.

    private DateTime _startTimeUtc;
    private DateTime _startTime;

    public DateTime StartTime
    {
        get { return _startTime; }
        set
        {
            _startTimeUtc = value.ToUniversalTime();
            _startTime = _startTimeUtc.Subtract(EasternTimeUtcOffSet);
        }
    }

    public DateTime StartTimeUtc 
    {
        get { return _startTimeUtc; }

        set
        {
            _startTimeUtc = value;
            _startTime = _startTimeUtc.Subtract(EasternTimeUtcOffSet);
        }
    }

    private static TimeSpan EasternTimeUtcOffSet
    {
        get { return TimeSpan.FromHours(4); }
    }

回答4:

  private int TimeZoneOffset()
  {
      DateTime dt = DateTime.Now;
      return dt.Subtract(dt.ToUniversalTime()).Hours;
  }

来源：https://stackoverflow.com/questions/6182017/get-utc-offset-in-wp7