The Inner Drive Extensible Architecture™—the Idea™

Demonstration: Time zones

The IDEA™ includes a fully-object-oriented, easy-to-integrate set of tools to allow you to use the Internet-standard tzinfo database—used throughout the world on millions of Unix computers—in your .NET apps.

Explore time zones

We've loaded 499 time zones for you to check out:

Choose a world region
Find the zone name
Current time

UTC	Sunday, September 15, 2019 2:11:44 PM UTC
Inner Drive HQ	Sunday, September 15, 2019 9:11:44 AM CDT
America/Chicago	Sunday, September 15, 2019 9:11:44 AM CDT

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If you want to use the IDEA™ in your commercial application, check out our licensing options.

How this works

The time zone handling classes are in the InnerDrive.TimeZones assembly. Most are internal to the assembly; generally, you only need to work with the TimeZoneFactory class. The factory parses the raw tzinfo database and makes it available through an injectable instance.

First, the appSettings.json file needs the following keys:

{
	"timeZoneSettings": {
		"defaultTimeZoneHomeZone": "America/Chicago",
		"storageConnectionString": "Your Azure storage account connection string",
		"throwOnFailure": "false",
		"timeZoneBlobName": "timezonedata"
	}
}

At application start, the factory initializes. The Application_Start event handler calls this method (using AutoFac for dependency injection):

private void InitializeTimeZones()
{
	Trace.WriteLine("Initializing time zones");
	var factory = ContainerProvider.RequestLifetime.Resolve<ITimeZoneFactory>();
	Trace.WriteLine(string.Format(CultureInfo.InvariantCulture,
		"Time zones initialized? {0}", factory.Initialized));
}

(By default, the factory will throw an exception if a time zone definition is corrupt. Use the "throwOnFailure" setting to prevent that behavior.)

At this point, you can use the default time zone—on this site, "America/Chicago", UTC-05:00—in one method call:

var thisZone = TimeZoneFactory.DefaultTimeZone;
var localTime = thisZone.ToLocalTime(DateTimeOffset.UtcNow);

Using a different zone is almost that easy. You simply call the TimeZoneFactory.FindZone method with the name of the zone you want. Here's the code from this page's code-behind:

// Exposed property for dependency injection
public ITimeZoneFactory TimeZoneFactory { get; set; }

private void SetLocalTime()
{
   var localZone = SelectedZone;
   resultPrompt.Text = localZone.Name;
   SetText(localZone, resultText);
}

private void SetText(IdtTimeZone timeZone, ITextControl control)
{
   var currentInfo = timeZone.CurrentInfo(SelectedTime);
   control.Text = string.Format(CultureInfo.CurrentCulture, "{0:D} {0:T} {1}",
      currentInfo.LocalTime,
      currentInfo.Abbreviation);
}

Behind the scenes, time zone information is cached, making lookups very fast, and saving the trouble (and computing resources) of loading the tzinfo database again.

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