# Install bttf with Homebrew, Nix, scoop

CLI tool for datetime arithmetic, parsing, formatting and more. Version 0.1.4 via Homebrew; verified 2026-06-11. Also installable with nix: nix profile install nixpkgs#bttf.

## Install

```sh
sudo av install brew:bttf
```

Additional install commands:

### macOS

- Homebrew (100%):

```sh
brew install bttf
```

  Evidence: local Homebrew formula metadata

### Linux

- Nix (92%):

```sh
nix profile install nixpkgs#bttf
```

  Evidence: nixpkgs package indexes: pkgs/by-name/bt/bttf/package.nix from https://api.github.com/repos/NixOS/nixpkgs/git/trees/master?recursive=1

### Windows

- Scoop (92%):

```sh
scoop install main/bttf
```

  Evidence: Scoop official bucket manifest trees: bucket/bttf.json from https://api.github.com/repos/ScoopInstaller/Main/git/trees/master?recursive=1

## Package facts

- **Package key:** brew:bttf
- **Package manager:** Homebrew
- **Version:** 0.1.4
- **Source summary:** CLI tool for datetime arithmetic, parsing, formatting and more
- **Homepage:** <https://github.com/BurntSushi/bttf>
- **Repository:** <https://github.com/BurntSushi/bttf>
- **Last updated:** 2026-06-11T15:52:32Z
- **Generated:** 2026-08-03T19:37:03+00:00

## Executables

- bttf (alias)

## Install behavior

- Bottle: not available

## Freshness

- Page generated: 2026-08-03
- Package-manager version: 0.1.4
## Project history and usage

bttf is a Rust command-line tool by BurntSushi for datetime parsing, formatting, arithmetic, time zones, durations, sequences, and pipeline-friendly transformations. It is young, but it sits in a familiar package niche: small CLIs that make date/time work scriptable.

### Project history

The first public release was published in May 2025 under the name Biff. The project README notes that it was later renamed to bttf, and the 0.1.4 release describes itself as the first release after that rename.

The project is built around a structured command model: bttf time, bttf span, and bttf tz subcommands cover actions such as formatting, arithmetic, rounding, sequencing, sorting, and time-zone lookup.

### Adoption history

Adoption is early and package-manager-oriented. The input metadata lists Homebrew and Nix packaging, while the upstream README also publishes precompiled archives and a crates.io package.

Its likely adopters are shell users, Rust users, log wranglers, and developers who need a more careful date/time CLI than basic date(1) pipelines.

### How it is used

bttf can print the current time, parse RFC 2822/RFC 3339/RFC 9557/ISO 8601 and relative datetimes, add or subtract spans, round durations, generate date sequences, convert time zones, and tag pipeline input so transformed timestamps can be joined back to original lines.

The README documents BTTF_LOCALE as an environment variable affecting locale support, but no persistent config or credentials file is documented.

### Why package nerds care

bttf is interesting less for age than for taste: it brings modern Rust datetime handling, rich timezone semantics, locale-aware formatting, static binary releases, Homebrew, Nix, and crates.io distribution to the humble date CLI problem.

For package maintainers, the rename from Biff to bttf is a useful bit of provenance because early release artifacts and history may still mention the old name.

### Timeline

- 2025: Initial 0.1.0 release published as Biff.
- 2026: Project renamed from Biff to bttf.
- 2026: bttf 0.1.4 published as the first release after the rename.

### Related projects

- Jiff is the Rust datetime ecosystem context associated with BurntSushi's date/time work.
- date(1) and GNU coreutils date are the traditional Unix tools bttf complements.
- crates.io distributes the Rust package, while Homebrew and Nix package the CLI for system users.

### Sources

- <https://api.github.com/repos/BurntSushi/bttf/releases?per_page=20>
- <https://github.com/BurntSushi/bttf#readme>
- <https://github.com/BurntSushi/bttf/blob/master/GUIDE.md>
- <https://github.com/BurntSushi/bttf/releases>
- source_facts.package-manager


## Security Notes

No matching local secret-handling manifest was found for bttf. Nucleus package metadata is still published here so future coverage has a stable package URL.


## Other Package-Manager Records

- Nix - bttf: normalized package name match | nixpkgs package indexes: pkgs/by-name/bt/bttf/package.nix from https://api.github.com/repos/NixOS/nixpkgs/git/trees/master?recursive=1
- Scoop - main/bttf: normalized package name match | Scoop official bucket manifest trees: bucket/bttf.json from https://api.github.com/repos/ScoopInstaller/Main/git/trees/master?recursive=1


## Combined YAML source

View the package source record on GitHub. [combined/bttf.yml](https://github.com/mxcl/pkgdb/blob/main/combined/bttf.yml)


## Sources

- pkg.so package database
- curated package history
- pkgdb category and tag curation
- external package-manager database matches
- cross-ecosystem install command graph