bttf

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  "desc": "CLI tool for datetime arithmetic, parsing, formatting and more",
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  "enrichment_fetched_at": "2026-06-20T23:36:00+00:00",
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  "full_name": "bttf",
  "github_default_branch": "master",
  "github_last_commit_at": "2026-05-29T03:49:51Z",
  "github_readme_excerpt": "bttf\n====\nA command line tool for datetime arithmetic, parsing, formatting and more.\n\n[![Build status](https://github.com/BurntSushi/bttf/workflows/ci/badge.svg)](https://github.com/BurntSushi/bttf/actions)\n[![Crates.io](https://img.shields.io/crates/v/bttf.svg)](https://crates.io/crates/bttf)\n\nDual-licensed under MIT or the [UNLICENSE](https://unlicense.org/).\n\n### Documentation\n\nThe [user guide] should be your first stop for understanding the high level\nconcepts that bttf deals with. Otherwise, consult `bttf --help` or\n`bttf \u003csub-command\u003e --help` for more specific details.\n\nAlternatively, there is a [comparison] between other similar tools that might\ngive you a quick sense of what bttf is like.\n\n\u003e [!TIP]\n\u003e This project was initially named Biff. It has been renamed to bttf.\n\n### Brief Examples\n\nPrint the current time:\n\n```console\n$ bttf\nSat, May 10, 2025, 8:02:04\u202fAM EDT\n```\n\n\u003e [!TIP]\n\u003e If you get output like `2025 M05 10, Mon 08:02:04` instead, that\u0027s because\n\u003e you likely don\u0027t have [locale support][locale] support configured. Enabling\n\u003e locale support requires setting `BTTF_LOCALE` in your shell environment.\n\nPrint the current time in a format of your choosing:\n\n```console\n$ bttf time fmt -f rfc3339 now\n2025-05-10T08:08:30.101066734-04:00\n\n$ bttf time fmt -f rfc9557 now\n2025-05-10T08:08:33.420946447-04:00[America/New_York]\n\n$ bttf time fmt -f \u0027%Y-%m-%d %H:%M:%S %Z\u0027 now\n2025-05-10 08:08:48 EDT\n```\n\nPrint multiple relative times in one command:\n\n```console\n$ bttf time fmt -f \u0027%c\u0027 now -1d \u0027next sat\u0027 \u0027last monday\u0027 \u00279pm last mon\u0027\nSat, May 10, 2025, 10:44:39\u202fAM EDT\nFri, May 9, 2025, 10:44:39\u202fAM EDT\nSat, May 17, 2025, 10:44:39\u202fAM EDT\nMon, May 5, 2025, 10:44:39\u202fAM EDT\nMon, May 5, 2025, 9:00:00\u202fPM EDT\n```\n\nPrint the current time in another time zone, and round it the nearest 15 minute\nincrement:\n\n```console\n$ bttf time in Asia/Bangkok now | bttf time round -i 15 -s minute\n2025-05-10T19:15:00+07:00[Asia/Bangkok]\n```\n\nAdd a duration to the current time:\n\n```console\n$ bttf ti",
  "github_repo": "BurntSushi/bttf",
  "github_stars": 728,
  "github_topics": [
    "cli",
    "command-line",
    "date",
    "datetime",
    "iana",
    "jiff",
    "recurrence-rule",
    "rfc-5545",
    "rust",
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    "strptime",
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    "timezone",
    "zone"
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  "license": "Unlicense OR MIT",
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  "ruby_source_path": "Formula/b/bttf.rb",
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