bttf

Command-line tool for datetime arithmetic, parsing, formatting, and recurrence rules.

Desktopfreeglobal

A command-line tool for parsing, formatting and computing dates and times, with timezone support and RFC 5545 recurrence rule handling. It addresses the inconsistencies and complexity of using platform-specific date utilities in shell scripts, providing a single scriptable CLI for arithmetic and complex recurrence parsing. Intended for developers and sysadmins who need portable, precise date logic; the project is open-source with permissive licensing for self-hosted use.

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