Converting Latitude and Longitude into a Time Zone and Local Time

A location given by GPS coordinates can be turned into a named time zone, which is more useful than a simple map marker for showing local time. The process has two stages: first identifying the zone for the location, then applying that zone's rules to a specific date. The example uses New York City, where the zone identifier America/New_York determines the local time and UTC offset. The article explains that a raw UTC offset does not capture daylight saving rules, which the IANA Time Zone Database maintains, and cautions that estimating time from longitude alone is unreliable. For applications, it recommends using a boundary dataset or service to map coordinates to zones, then formatting times with JavaScript's Intl.DateTimeFormat.