Date Difference Calculator

Version: 1.0.0 (Initial Release - April 2025)

A versatile, responsive web-based tool designed for various date and time calculations. It allows users to compute the duration between two dates, add or subtract time periods from a specific date, calculate working days excluding weekends and holidays, and perform simple date arithmetic.

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Features

• Calculate Date & Time Difference: Find the precise duration between a start and end date/time, broken down into years, months, days, hours, minutes, and seconds. Also shows the total number of calendar days between the dates.
• Add/Subtract Time: Add or subtract a specific number of years, months, and/or days to/from a given start date to find a future or past date.
• Working Days Calculation: Determine the number of working days between two dates, automatically excluding weekends (configurable start of the week - Sunday, Monday, or Saturday) and optionally excluding a list of user-defined holidays.
• Date Arithmetic (Days): Quickly add or subtract a specific number of days to/from either the start date or the end date.
• User-Friendly Interface:
  • Clean, modern dark theme.
  • Responsive design for usability on desktop and mobile devices.
  • "Today" and "Now" buttons for quickly setting current date and time.
  • Clear display of results.
  • Input validation and error messages.

How It Works

The tool operates based on the "Calculation Type" selected:

1. Calculate Difference:

   • Enter a Start Date and optionally a Start Time.
   • Enter an End Date and optionally an End Time. (End Date must be on or after Start Date).
   • Ensure Calculate Difference is selected in the Calculation Type dropdown.
   • Click the Calculate button.
   • The results area will display the duration breakdown (Years, Months, Days, Time if applicable) and the total calendar days between the two dates.

2. Add/Subtract Time:

   • Enter a Start Date and optionally a Start Time. (The End Date fields are hidden for this mode).
   • Select Add/Subtract Time from the Calculation Type dropdown.
   • The "Amount of Time to Add/Subtract" section appears.
   • Choose (+) Add or (-) Subtract from the dropdown.
   • Enter the number of Years, Months, and/or Days you wish to add or subtract (at least one value must be non-zero).
   • Click the Calculate button.
   • The results area will show the original date and the resulting new date and time.

3. Working Days Between:

   • Enter a Start Date.
   • Enter an End Date. (End Date must be on or after Start Date).
   • Select Working Days Between from the Calculation Type dropdown.
   • The "Working Days Options" section appears.
   • Select the First Day of Week (Sunday, Monday, or Saturday) to define the weekend.
   • Optionally, enter specific Holidays in YYYY-MM-DD format, separated by commas (e.g., 2025-12-25, 2026-01-01).
   • Click the Calculate button.
   • The results area will show the total calendar days, working days, weekend days, and holidays (that fall on working days) within the specified range.

4. Add/Subtract Days:

   • Enter a Start Date and optionally a Start Time.
   • Enter an End Date and optionally an End Time. (Both are available as potential base dates).
   • Select Add/Subtract Days from the Calculation Type dropdown.
   • The "Date Arithmetic Options" section appears.
   • Choose the Base Date (Start Date or End Date) from which to calculate.
   • Enter the number of Days to Add (+) or Subtract (-) (e.g., 30 to add 30 days, -15 to subtract 15 days). Must be non-zero.
   • Click the Calculate button.
   • The results area will show the base date used and the resulting new date and time.

Quick Inputs: Use the Today and Now buttons next to the date and time fields to quickly populate them with the current date and time.

Live Link

Access the Date Difference Calculator here: LIVE LINK HERE

What's Next? (Potential Future Enhancements)

• Timezone Support: Allow users to select timezones for more accurate calculations across regions.
• Holiday Presets: Include built-in holiday lists for common regions/countries.
• Recurring Events: Calculate dates based on recurring patterns (e.g., every 2nd Friday).
• Format Options: Allow users to choose different date/time display formats.
• Result Sharing/Export: Option to copy, share, or export the calculation results.
• UI Themes: Add light theme option.

Copyright

Copyright (c) 2025 Date Difference Calculator Developed by R. Sabbir | All Rights Reserved