TL;DR
Biff is a command line utility designed for advanced datetime operations, including parsing, formatting, and calculations. It is open-source and aims to simplify complex date-time tasks.
A new command line tool named Biff has been launched, offering an extensive set of features for datetime manipulation, including parsing, formatting, arithmetic, and timezone conversions. It is designed to serve as a versatile ‘Swiss army knife’ for datetime tasks, and is open-source under MIT or UNLICENSE, making it accessible for developers and system administrators.
Biff is a command line utility that provides a wide range of datetime functions, such as printing the current time in various formats, converting between time zones, adding durations, and formatting timestamps. It supports complex operations like calculating the difference between dates, generating sequences of specific weekdays, and reformatting log timestamps. The tool is available for Linux, Windows, and macOS, with precompiled binaries and a Rust library version via Cargo. It includes features like locale support, which can be enabled during installation. Its documentation offers numerous examples, demonstrating its capabilities for tasks like log analysis and scheduling. Biff is dual-licensed under MIT or UNLICENSE, emphasizing open-source accessibility and flexibility for users.
Why It Matters
As a comprehensive datetime command line tool, Biff can significantly streamline workflows that involve date calculations, log processing, scheduling, and timezone conversions. Its versatility reduces the need for multiple utilities, potentially increasing efficiency for developers and system administrators. The open-source nature encourages community contributions and integration into various automation scripts, making it a notable addition to the ecosystem of command line tools.
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Background
Existing datetime tools like GNU date or specialized scripts have served similar purposes but often lack the breadth of features or ease of use that Biff aims to provide. The recent release aligns with ongoing trends toward more powerful, scriptable utilities for system automation and log analysis. Prior tools typically required multiple commands or custom scripts to perform complex operations, whereas Biff consolidates many functions into a single, consistent interface.
“Biff aims to be the Swiss army knife for datetime tasks on the command line, simplifying complex operations with a unified tool.”
— Biff’s developer
“Having a single utility that handles parsing, formatting, timezone conversion, and date arithmetic is a game-changer for automation scripts.”
— Open-source community member
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What Remains Unclear
It is still unclear how widely adopted Biff will become or how it will compare in performance and features to existing tools like GNU date or Python libraries. User feedback and real-world use cases are still emerging.
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What’s Next
Further development may include additional features, user feedback integration, and community contributions. The maintainers might also release updates to improve localization support and performance. Monitoring user adoption and integration into scripts and workflows will determine its long-term impact.

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Key Questions
What platforms does Biff support?
Biff is available for Linux, Windows, and macOS, with precompiled binaries for each platform. It can also be installed via Rust’s Cargo package manager.
Is Biff open-source?
Yes, Biff is dual-licensed under MIT or UNLICENSE, making it freely available for modification and redistribution.
How does Biff compare to existing datetime tools?
Biff consolidates many functions—parsing, formatting, timezone conversion, date arithmetic—into a single utility, potentially reducing the need for multiple tools or scripts. Its extensive feature set aims to surpass basic utilities like GNU date.
Can I extend Biff’s functionality?
Yes, as a Rust library, developers can integrate and extend Biff’s features within their own applications or scripts.
Source: Hacker News