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Version: 1.0

📆 Count Days Calculator

This calculator helps you count how much time has passed between two calendar dates. It's perfect for calculating age, tenure, deadlines, or project durations.

🟪 Features & Tabs​

1. Tabs​

  • Count Days: Calculates duration between two specific dates.
  • Add/Subtract: (Not shown in result, but toggled from the top-right) lets you shift a date forward/backward by a number of days.

📥 Input Fields (Count Days Mode)​

1. Start Date​

  • The beginning date of your count.
  • Example: 10/15/1986

2. End Date​

  • The ending date of your count.
  • Example: 10/15/2022

3. Include End Day (+1 day)​

  • Toggle this ON to include the end date in the calculation (adds one day to total).
  • Useful when counting inclusive durations (e.g. events that span full days).

📅 Holidays (Optional)​

  • Allows you to exclude selected holidays from the count if configured.

▶️ Calculate Button​

Click the “Calculate” button to generate a detailed duration result.

📊 Output (Results Section)​

Displays the full time span in multiple units:

UnitExample Output
Years36 years
Months864 months
Weeks/Days1,878 weeks 3 days
Days13,149 days
Hours315,576 hours
Minutes18,934,560 minutes
Seconds1,136,073,600 seconds

Also includes:

  • Calendar view highlighting start and end dates

📝 Example​

Input:​

  • Start: 10/15/1986
  • End: 10/15/2022
  • Include End Day: OFF

Output:​

  • 36 years exactly (13,149 days)
  • or 1.1+ billion seconds!

✅ Use Cases​

  • Age or birthday calculations
  • Employee service length
  • Time since an event (wedding, contract, etc.)
  • Historical timelines
  • Legal, academic, or business durations