HumanDateDiff (Delphi)

HumanDateDiff is a pure Delphi library for converting date/time differences into human-readable text, inspired by Moment.js / Day.js / Humanizer, but designed specifically for native Delphi (Win32/Win64/FMX).

✔ No external dependencies
✔ Locale-aware (English, Portuguese, and 10+ Indian languages)
✔ Smart calendar rules
✔ Production-ready

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✨ Features

• Human-readable date differences
  • just now
  • yesterday / tomorrow
  • last week / next week
  • last month / next month
  • last year / next year
• Composite output
  • 2 days, 3 hours ago
• Smart thresholds
  • 6 days → last week
  • 30 days → last month
• Locale-specific plural rules
  • Correct Hindi & Gujarati grammar
• Fluent API
• Full DUnitX test suite
• Runtime Package (.bpl) support

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📦 Installation

Option 1: Use Source Directly (Recommended)

Add the Source folder to your Delphi Library Path.

Option 2: Runtime Package

1. Open Packages/HumanDateDiffRT.dpk
2. Build (or Install)
3. Add HumanDateDiffRT to your project runtime packages

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🚀 Basic Usage

uses HumanDateDiff, HumanDateDiff.Lang.EN;

ShowMessage(
  THumanDateDiff.New
    .Lang(LangEN)
    .Diff(Now - 2, Now)
);
// → "2 days ago"

🧩 Composite Output

THumanDateDiff.New
  .Lang(LangEN)
  .MaxUnits(2)
  .Diff(Now - 2 - EncodeTime(3,0,0,0), Now);
// → "2 days, 3 hours ago"

🌍 Locale Examples

Hindi 🇮🇳

THumanDateDiff.New
  .Lang(LangHI)
  .Diff(Now - 3, Now);
// → "3 दिन पहले"

Gujarati 🇮🇳

THumanDateDiff.New
  .Lang(LangGU)
  .Diff(Now - 5, Now);
// → "5 દિવસ પહેલા"

🧠 Smart Rules Examples

1 day ago        → yesterday
6 days ago       → 6 days ago
7 days ago       → last week
30 days ago      → last month
400 days ago     → last year

Tests

This project includes a full DUnitX test suite.

To run tests:

Open Tests/HumanDateDiff.Tests.dproj

Build & Run

📚 Documentation

docs/DESIGN.md – Architecture & design decisions

docs/LANGUAGE_GUIDE.md – Adding new languages/locales

🛣 Roadmap

• Additional Indian languages
• CLDR plural categories
• Time-zone aware rules
• GitHub Actions CI
• GetIt package support

📄 License

MIT License – free for commercial and open-source use.

🤝 Contributing

Pull requests are welcome. Please include tests for new features or language packs.