DateKeep

The definitive date and time utility

The Ultimate Date Calculator and Time Utility Hub

October 14, 2025

From professional project management to simple personal curiosity, calculating dates is a fundamental need. This all-in-one date calculation hub brings together every tool you need to master schedules, understand history, and plan for the future with precision and ease.

Essential Date Tools for Everyday Use

These tools answer the most common questions you have about dates, from your own age to the day of the week a special event falls on.

Professional Date Calculators for Business & Projects

For project managers and business professionals, accuracy is everything. These tools are designed to handle the complexities of business schedules, ensuring your timelines are realistic and reliable.

  • Workdays Deadline Calculator: Add a specific number of business days to a start date, automatically skipping weekends and holidays.
  • Holiday Calendar: View national and religious holidays for various countries to ensure your schedule accounts for days off.

Technical & Historical Date Calculators

For developers, historians, and scientists, certain calculations require specialized knowledge. These tools handle the complex rules of various calendar systems.

Further Reading

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