Calculate Date Differences, Business Days, & Deadlines
Calculating elapsed calendar days, working business days (excluding weekends), and project milestone deadlines is essential for contract scheduling, project management, and compliance timelines. Manual date arithmetic often fails to account for leap years and irregular month day counts.
TabKit Date Calculator performs calendar math in local memory using native ISO 8601 date logic. Calculate exact time intervals in days, weeks, months, or years between two calendar dates, or add/subtract time offsets to determine exact future deadlines with total privacy.
Frequently Asked Questions
How does the calculator handle leap years and February?
The algorithm uses standard astronomical UTC Gregorian calendar rules, automatically accounting for 29-day leap Februaries and variable month lengths.
Can I calculate business days excluding weekends?
Yes. You can toggle business day calculations to count only Monday through Friday, ideal for legal filing deadlines and sprint scheduling.
Is this tool available offline?
Yes. Because TabKit is built as a local PWA, all date calculations run on your device without requiring an active internet connection.