@namespace BlazorLib

var timeZoneOffSet = await jsRuntime.InvokeAsync<int>("eval", "new Date().getTimezoneOffset()");

var ianaTimeZoneName = jsRuntime.Invoke<string>("eval",
    "(function(){try { return ''+ Intl.DateTimeFormat().resolvedOptions().timeZone; } catch(e) {} return 'UTC';}())");

<?xml version="1.0"?>
<configuration>
  <system.webServer>
     <rewrite>
         <rules>
            <rule name="React Routes" stopProcessing="true">
              <match url=".*" />
              <conditions logicalGrouping="MatchAll">
                    <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
                    <add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
              </conditions>
              <action type="Rewrite" url="/index.html" />
            </rule>
         </rules>
     </rewrite>
  </system.webServer>
</configuration>