Date addition and subtraction calculator

How to use the calculator:

1. Enter your start date using the date picker.
2. Select the operation you want to perform from the dropdown menu:
• Add/Subtract Days: Adds or subtracts a specific number of days to/from the start date
• Add/Subtract Weeks: Adds or subtracts a specific number of weeks to/from the start date
• Add/Subtract Months: Adds or subtracts a specific number of months to/from the start date
• Add/Subtract Years: Adds or subtracts a specific number of years to/from the start date
3. Enter the quantity (number) in the quantity field.
4. Click the "Calculate" button to see the result.
5. Click "Reset" to clear all inputs and start over.

Examples:

• To find a date 30 days after June 1, 2023: Select "Add Days", enter "30" as quantity, and set the start date to "2023-06-01"
• To find a date 2 weeks before December 25, 2023: Select "Subtract Weeks", enter "2" as quantity, and set the start date to "2023-12-25"
• To find your next birthday if your birthday is on May 15: Select "Add Years", enter "1" as quantity, and set the start date to "2023-05-15"

Important Notes:

• The calculator automatically handles month and year transitions (e.g., adding 1 month to January 31 will result in March 2)
• For month operations, the quantity is 1-based (e.g., "1" for January, "2" for February)
• The calculator uses your browser's local date settings for displaying results