https://www.w3schools.com/jsreF/jsref_zoneddatetime_toinstant.asp
JavaScript Temporal.ZonedDateTime toInstant() Method
Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML...
javascripttemporalzoneddatetimemethod
https://docs.deno.com/api/web/~/Temporal.ZonedDateTime.offset
Temporal.ZonedDateTime.offset - Web documentation
In-depth documentation, guides, and reference materials for building secure, high-performance JavaScript and TypeScript applications with Deno
temporalzoneddatetimeoffsetwebdocumentation
https://bcd-training.deno.dev/feature?id=javascript.builtins.Temporal.ZonedDateTime.until
Feature: javascript.builtins.Temporal.ZonedDateTime.until
A summary of Browser Compat Data for javascript.builtins.Temporal.ZonedDateTime.until
featurejavascriptbuiltinstemporalzoneddatetime
https://www.nodatime.org/2.1.x/userguide/zoneddatetime-patterns
Noda Time | Patterns for ZonedDateTime values
noda timepatternszoneddatetimevalues