timezone-js

Maintains full API compatibility with native JavaScript Date, using identical getter and setter methods, making it a seamless replacement in existing codebases as emphasized in the README.

Relies on official IANA timezone files from the authoritative Olson database, ensuring correct timezone calculations including daylight saving time transitions, as highlighted in the features.

Stores date components as named properties, allowing direct serialization to JSON for data transfer without additional formatting, a key advantage noted in the overview.

Supports preloading, lazy-loading, or manual loading of timezone data via configurable schemes, enabling performance tuning based on specific application needs, detailed in the Customizing section.