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copied!<p>It would seem that you have indeed discovered a bug with the AppliationSettings object. If you are intent on storing DateTimeOffset values in the ApplicationSettings, then this approach will work.</p> <p>Create a class with your settings:</p> <pre><code> public class MyAppSettings { public DateTimeOffset Foo { get; set; } public DateTimeOffset Bar { get; set; } } </code></pre> <p>Change your methods as follows:</p> <pre><code> private void Save() { Collection<MyAppSettings> myAppSettings = new Collection<MyAppSettings>(); myAppSettings.Add(new MyAppSettings { Foo = new DateTimeOffset(2012, 12, 12, 12, 12, 12, TimeSpan.Zero), Bar = new DateTimeOffset(2011, 11, 11, 11, 11, 11, TimeSpan.Zero) }); IsolatedStorageSettings.ApplicationSettings["MyAppSettings"] = myAppSettings; } private void Load() { Collection<MyAppSettings> myAppSettings = (Collection<MyAppSettings>)IsolatedStorageSettings.ApplicationSettings["MyAppSettings"]; string foo = myAppSettings.First().Foo.ToString(); string bar = myAppSettings.First().Bar.ToString(); } </code></pre> <p>However, I would read this answer for a technique to store this type of information in your own settings file. <a href="https://stackoverflow.com/questions/6684416/windows-phone-7-isolatedstoragesettings-applicationsettings-complex-data">windows phone 7 IsolatedStorageSettings.ApplicationSettings complex data</a></p> <p>Additionally, you could approach this with even more simplicity and avoid using a Collection by changing your Save and Load methods as follows.</p> <pre><code> private void Save() { MyAppSettings myAppSettingsSimple = new MyAppSettings { Foo = new DateTimeOffset(2012, 12, 12, 12, 12, 12, TimeSpan.Zero), Bar = new DateTimeOffset(2011, 11, 11, 11, 11, 11, TimeSpan.Zero) }; IsolatedStorageSettings.ApplicationSettings["MyAppSettingsSimple"] = myAppSettingsSimple; } private void Load() { MyAppSettings myAppSettingsSimple = (MyAppSettings)IsolatedStorageSettings.ApplicationSettings["MyAppSettingsSimple"]; txtFoo.Text = myAppSettingsSimple.Foo.ToString(); txtBar.Text = myAppSettingsSimple.Bar.ToString(); } </code></pre>

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