Date Calculator

Days Between Two Dates

Start Date:

End Date:

Add to/Subtract from Date

Start Date:

Add Subtract

Holiday Settings

This enhanced Date Calculator includes: 

 1. Days Between Two Dates Calculator: 

 - Calculates difference in years, months, weeks, and days 

 - Settings button to exclude specific holidays

 - Handles date validation 

 2. Add/Subtract from Date Calculator:

 - Allows adding/subtracting years, months, weeks, and days

 - Handles complex date calculations 

 - Shows resulting date 

 3.Holiday Settings: 

 - Includes pre-loaded U.S. federal holidays for 2025-2026 

 - Customizable holiday exclusion system 

 - Modal interface for holiday management

 4. Enhanced UI:

 - Responsive design 

 - Clear section separation 

 - Better form controls

 - Error handling

 To use: 

1. Select dates in either section 

2. For date difference: choose start/end dates and click "Calculate Difference"

3. For date modification: choose base date, operation, and values to add/subtract 

4. Use Settings to manage holiday exclusions The calculator handles complex date calculations while considering month lengths and leap years. The holiday system can be expanded with additional dates as needed.