Yesterday CLI

yesterday is a tiny Python CLI tool that tells you what day was yesterday. Nothing more. Nothing less.

It handles all the hard work of going back in time by exactly one day — so you don’t have to.

Built with zero dependencies, just pure Python and a mild sense of humor.

Tutorial

• Medium: Publish Your Python Package to PyPI

Branches

• steps/1-boilerplate – Basic project boilerplate
• steps/2-add-uv – Added uv for packaging and dependency management
• steps/3-publish-config – Added PyPI publishing configuration
• steps/4-automatic-versioning – Enabled automatic versioning
• steps/5-github-action – Set up GitHub Action for automated publishing

Usage

$ yesterday --help

usage: yesterday [-h] [-d] [-q]

Tell you what day was yesterday.

options:
  -h, --help     show this help message and exit
  -d, --date     print yesterday's full date
  -q, --quiet    just output the date, no text

Examples

$ yesterday
Yesterday was Friday.

$ yesterday --date
Yesterday was 2025-04-11.

$ yesterday --quiet --date
2025-04-11