Coffe2CodeGuides
How the calculations work, with worked examples.
JWT Explained: Header, Payload and SignatureWhat is inside a JSON Web Token, and what decoding does and does not prove.Cron Syntax Explained, With ExamplesThe five fields, special characters and the schedules people get wrong.Regex Cheat Sheet for JavaScriptCharacter classes, quantifiers, groups, lookarounds and flags on one page.Unix Time ExplainedEpoch seconds vs milliseconds, time zones, leap seconds and the 2038 problem.