Interactive Calendar
Browse months, select dates, and calculate date information
How to Use the Calendar
Navigate Months
Use the arrow buttons to move between months, or click "Go to Today" to return to the current date.
Select a Date
Click on any date to select it and view detailed information about that day.
View Details
See day of week, week number, day of year, and calculate days until or since the selected date.
Calendar Features
Month & Year Navigation
Easily browse through any month and year with intuitive navigation buttons. Jump to today instantly.
Date Selection & Highlighting
Click any date to select it. Today's date is highlighted, and selected dates are clearly marked.
Week Numbers
Automatically calculates and displays the week number of the year for any selected date.
Date Calculations
Calculate days until or since any date, day of year, and automatically detect leap years.
Detailed Information
View full date formatting, day of week, and comprehensive year information including leap year status.
Responsive Design
Works perfectly on all devices - desktop, tablet, and mobile with touch-friendly interface.
Common Uses
Event Planning
Plan events, check day of week for specific dates, and calculate time until events.
Project Scheduling
Plan project timelines, track deadlines, and manage milestones with date calculations.
Birthday Tracking
Find day of week for birthdays, calculate days until celebrations, and plan parties.
Travel Planning
Check dates for trips, calculate vacation duration, and plan itineraries.
Academic Scheduling
Track semester dates, exam schedules, and academic deadlines throughout the year.
Date Reference
Quick reference for any date, check historical dates, or plan future events.
Calendar Facts
Leap Years
A leap year occurs every 4 years, except for years divisible by 100 (unless also divisible by 400). This adds an extra day (February 29) to keep our calendar aligned with Earth's orbit.
Week Numbering
Week numbers are calculated based on ISO 8601 standard, which defines the first week of the year as the week containing the first Thursday of January.
Gregorian Calendar
The calendar we use today is the Gregorian calendar, introduced by Pope Gregory XIII in 1582 to correct the Julian calendar's drift from the solar year.