How to Get Timezone Information from Latitude and Longitude Without External Web Services?

Obtaining Timezone Information from Latitude and Longitude without External Web Services

Determining the timezone associated with a specific latitude and longitude without relying on web services like Geonames.org can be achieved through local data manipulation.

Solution:

One approach recommended by experienced developers involves the following steps:

1. Obtain the Database of Cities from Geonames.org: This database provides a comprehensive collection of cities worldwide with associated timezone information.
2. Convert to a Compact Format: The database can be converted into a concise format that maps latitude and longitude coordinates to their respective timezones.
3. Utilize an R-Tree Implementation: An R-Tree is a data structure that enables efficient spatial searches. By implementing an R-Tree, you can rapidly identify the nearest city (and its timezone) to the given coordinate.

This approach ensures accurate timezone determination without the need for external web services, allowing for reliable and efficient data processing in PHP.

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