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bttf vs pdd: catalog facts
bttf	pdd
Free Free and open source, dual-licensed under MIT or the Unlicense.	Free Free and open source under the GPL.
Windows, Command line	Windows, Command line
Datetime parsing, formatting and arithmetic in one tool User guide and comparison with other tools	Quick date and time difference calculations from the terminal Built-in countdown timer
Young project with a short history Command-line only	Command-line only, with no graphical interface Requires Python 3
Downloadable app	Downloadable app
Open source	Open source
License: MIT OR Unlicense	License: GPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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