Practical guides on Unix timestamps, JWT tokens, timezone handling and date conversion — for developers who work with real systems.
Every method you need: Unix seconds vs milliseconds, Date conversion, Intl formatting, timezone handling, relative time, and TypeScript branded types. No library required.
Why your timestamp shows 1970, how to detect precision automatically, and the rules for every language and API you'll encounter.
Read the exp, iat, and nbf claims from any JWT token using pure JavaScript — no jsonwebtoken, no dependencies.
DST transitions are responsible for some of the most cryptic bugs in production. Here's how to protect your system.
Why you should always use timezone-aware datetimes, how fromtimestamp() can lie to you, and the correct patterns for production.
The definitive guide to storing, querying and converting timestamps in PostgreSQL — including TO_TIMESTAMP, AT TIME ZONE, and common pitfalls.