A command-line utility that compares two durations and shows how much faster (or slower) the second is than the first. Outputs the difference in HH:MM:SS, seconds, and percentage.

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes.

• Rust (2024 edition)

Clone the repository and build:

$ git clone <repository-url>
$ cd howmuch
$ cargo build --release

The binary will be at target/release/howmuch.

You can also install with:

$ cargo install --path .

$ howmuch <duration1> <duration2>

Durations can be specified as HH:MM:SS or MM:SS. You can mix formats between the two arguments.

$ howmuch 01:00:00 00:45:00
00:15:00 faster (900 seconds, 25.00% faster)

$ howmuch 00:30:00 00:45:00
-00:15:00 slower (-900 seconds, -50.00% slower)

$ howmuch 01:00:00 45:00
00:15:00 faster (900 seconds, 25.00% faster)

$ howmuch 01:00:00 01:00:00
00:00:00 same (0 seconds, 0.00% same)

Build a release binary and copy it to your PATH:

$ cargo build --release
$ cp target/release/howmuch /usr/local/bin/

• Main: stable release branch
• Feature: feature/<name> for new features
• Bugfix: bugfix/<name> for fixes

• Built with Rust
• No external dependencies
• Vibe-coded with Kiro CLI

Copyright © 2026 Rob Warner

Licensed under the MIT License