Day Calculator
Calculate days between dates, add/subtract days, and find weekdays
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What is a Day Calculator?
A Day Calculator is a tool that helps users compute the number of days between two dates, add or subtract days from a given date, or determine the day of the week for a specific date. It is useful for planning events, tracking deadlines, calculating age, and managing schedules.
Key Features of a Day Calculator
Date Difference Calculator
Calculates the exact number of days, weeks, months, or years between two dates.
Useful for project timelines, vacation planning, or legal deadlines.
Add/Subtract Days from a Date
Finds a future or past date by adding or subtracting days.
Example: "What will be the date 45 days from today?"
Day of the Week Finder
Identifies the weekday (e.g., Monday, Tuesday) for any historical or future date.
Example: "What day was July 4, 1776?" (Answer: Thursday)
Business Days Calculator
Excludes weekends (Saturday & Sunday) and optionally holidays.
Useful for work-related deadlines, shipping estimates, and payroll.
Age Calculator
Computes a person’s exact age in years, months, and days.
Countdown Timer
Tracks days remaining until an event (e.g., weddings, exams, holidays).
How Does a Day Calculator Work?
1. Calculating Days Between Two Dates
Input Start Date and End Date.
The calculator counts each day in between (inclusive or exclusive).
Example:
Start: January 1, 2025
End: January 10, 2025
Result: 9 days
2. Adding/Subtracting Days
Input a base date and the number of days to add/subtract.
Example:
Date: March 15, 2025
Add: 10 days
Result: March 25, 2025
3. Finding the Day of the Week
Uses Zeller’s Congruence or other algorithms to determine the weekday.
Example:
Date: December 25, 2025
Day: Thursday
4. Business Days Calculation
Skips weekends and custom holidays (e.g., Christmas, New Year’s).
Example:
Start: Monday, June 1
Add: 5 business days
Result: Monday, June 8 (excluding weekends)