c# - System.DateTime is not getting updated in Server but working fine in Local

Question

I have written some code to set Application time based on a country dropdown based on a location. It works fine in local but not working in Server once deployed please help...

 Date Time AppTime = new DateTime();

  protected void Page_Load(object sender, EventArgs e)
  {  
   AppTime = new DateTime();
   //Time Zone Changes for other Countries            
   TimeZoneInfo tzi1 = TimeZoneInfo.FindSystemTimeZoneById("AUS Eastern Standard Time");
   DateTime IndTime = DateTime.Now;
   DateTime CurrentUTC = TimeZoneInfo.ConvertTimeToUtc(IndTime);
   DateTime OzzieTime = TimeZoneInfo.ConvertTimeFromUtc(CurrentUTC, tzi1);

  string SelectedCountry = ddlCountry.SelectedValue.ToString();
  string Australia = ConfigurationManager.AppSettings["AustraliaCountryID"];

  if (SelectedCountry == Australia)
  {       
    AppTime = OzzieTime;
  }
  else
  {       
    AppTime = IndTime;
  }

        TextBox1.Text = AppTime.ToString();
        TextBox2.Text = DateTime.UtcNow.ToString();
        TextBox3.Visible = OzzieTime.ToString();;

Answer 1

All your code needs to do is this:

string tzid = SelectedCountry == Australia
              ? "AUS Eastern Standard Time"
              : "India Standard Time";

TimeZoneInfo tz = TimeZoneInfo.FindSystemTimeZoneById(tzid);
DateTime appTime = TimeZoneInfo.ConvertTimeFromUtc(DateTime.UtcNow, tz);

Of course, you are making a serious mistake in thinking that all of Australia is on a single time zone. See this Wikipedia article for details.

What's likely the reason that your code didn't work when you sent it to production is that you were relying on DateTime.Now to be India. There's a good chance that your server is in another time zone. For example, it's a best practice to put servers in UTC.

Besides, it's a bit silly to think that your users will only be in one of two different time zones. You should probably just create a list via TimeZoneInfo.GetSystemTimeZones(), using the .Id and .DisplayName of each item.

You might also want to make sure that your servers have the latest Windows Updates, or you have applied the Time Zone Updates manually.