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Calculate the difference between two dates, add or subtract days/months/years, and find business days
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Calculate date differences, add or subtract days, and explore date information
Select dates to see the calculation
Explore comprehensive date calculations with 7 specialized tools. Calculate date differences, add or subtract time periods, work with business days, convert week numbers, analyze date information, and compare multiple dates - all with precise calculations and detailed breakdowns.
Our comprehensive Date Calculator is a powerful all-in-one tool designed to handle every date-related calculation you might need. Whether you're planning projects, calculating deadlines, tracking business days, or simply exploring date properties, this calculator provides precise results with detailed breakdowns.
What makes this calculator unique: Unlike basic date calculators, we offer 7 specialized tools in one interface: date difference calculations with business days and holiday exclusions, add/subtract date operations, business days counting with country-specific holidays, week number conversions using ISO 8601 standard, comprehensive date information including zodiac signs and seasons, and multi-date comparison analysis. All calculations run locally in your browser for privacy and speed.
Smart date calculation tips: Use business days calculations for project planning and deadline tracking. Leverage country-specific holiday exclusions for accurate international business day counts. Take advantage of quick presets for common date ranges. Use the week number converter for ISO 8601 compliant week tracking. Explore date information to understand calendar properties and relationships.
All calculations run locally in your browser. We don't store or transmit your date data—your privacy is guaranteed.
A Date Calculator is a versatile tool that performs various date-related calculations including finding the difference between two dates, adding or subtracting time periods, calculating business days excluding weekends and holidays, converting between dates and week numbers, extracting detailed date information, and comparing multiple dates. It's essential for project management, deadline tracking, scheduling, and any scenario requiring precise date arithmetic.
Our Date Calculator offers 7 specialized tools accessible through tabs. Each tool is designed for specific date calculation needs:
Calculate the exact time span between two dates. Enter your start and end dates, choose whether to include the end date, and get comprehensive results including total days, weeks, months, business days (excluding weekends and holidays), weekdays, hours, minutes, and seconds. Perfect for project timelines, age calculations, and duration tracking.
Add or subtract days, weeks, months, or years from any date. Simply select your base date, choose the operation (add or subtract), specify the amount and unit, and instantly see the result date with detailed information. Ideal for finding future deadlines, past dates, and date projections.
Count business days between two dates, excluding weekends and public holidays. Select your country to get accurate holiday exclusions, choose whether to include Saturdays, and optionally include the end date. Results show total business days, weekdays, holidays excluded, and a detailed holiday list. Essential for project planning and deadline calculations.
Add or subtract a specific number of business days from a date. Control whether to exclude weekends and holidays, choose to include Saturdays in your work week, and see a detailed journey breakdown showing total days, business days, weekends skipped, holidays excluded, weeks, and remaining days. Perfect for calculating delivery dates and project milestones.
Convert between week numbers and dates using the ISO 8601 standard. In 'Week to Date' mode, enter a year, week number, and day of week to find the corresponding date. In 'Date to Week' mode, select a date to find its week number, day of year, quarter, and other calendar properties. Useful for ISO week tracking and calendar conversions.
Get comprehensive information about any date including day of week, week number (ISO 8601), day of year, quarter, month name, zodiac sign, season, leap year status, days remaining in year, and technical formats (ISO 8601, Unix timestamp, Julian day). Perfect for exploring date properties and calendar relationships.
Compare up to 5 dates simultaneously. Analyze intervals between dates, find the largest and smallest gaps, calculate total span, and view distribution analysis by year, month, and day of week. See all intervals in a collapsible list. Ideal for scheduling, event planning, and date pattern analysis.
Our Date Calculator serves professionals, students, and individuals across various scenarios:
Project Management & Planning:
Calculate project durations, track deadlines, determine business days for deliverables, and plan milestones. Use business days calculations to account for weekends and holidays in your timeline.
Deadline Tracking:
Find exact dates by adding business days to a start date. Calculate how many business days remain until a deadline. Essential for meeting project timelines and delivery schedules.
Age & Duration Calculations:
Calculate exact age in years, months, and days. Find the duration between two events. Determine time spans for contracts, subscriptions, or any time-based commitments.
Event Scheduling:
Compare multiple dates to find optimal scheduling windows. Analyze date distributions to identify patterns. Calculate intervals between events for planning purposes.
Financial Planning:
Calculate interest periods, determine payment due dates, track billing cycles, and plan financial milestones. Business days calculations help with payment processing timelines.
Academic & Research:
Use week number conversions for ISO 8601 compliant date tracking. Extract date properties for research and analysis. Compare dates for historical or scientific studies.
Our Date Calculator stands out with advanced features and precision:
7 Specialized Tools in One:
Access date difference, add/subtract, business days, week numbers, date information, and comparison tools from a single interface. Switch between tools seamlessly without losing your data.
Country-Specific Holiday Support:
Accurate business days calculations with support for 15+ countries including US, UK, India, Japan, Australia, Canada, and more. Holidays are dynamically calculated using the date-holidays library, ensuring accuracy for any year.
ISO 8601 Week Number Standard:
Week number calculations follow the international ISO 8601 standard, ensuring compatibility with global systems and standards. Perfect for international projects and compliance requirements.
Comprehensive Result Breakdowns:
Get detailed metrics including total days, weeks, months, hours, minutes, seconds, business days, weekdays, and working hours. See exactly how calculations are performed with transparent methodology.
100% Private & Local:
All calculations run entirely in your browser. No data is sent to servers, ensuring complete privacy and security. Your date information never leaves your device.
Mobile-First Design:
Fully responsive interface that works perfectly on desktop, tablet, and mobile devices. Touch-friendly controls and optimized layouts for all screen sizes.
Senior Data Scientist
Credentials: PhD Mathematics, M.Sc Statistics
Dr. Sharma holds a PhD in Applied Mathematics from IIT Delhi and specializes in computational algorithms. She reviews all scientific and mathematical calculators for accuracy using international IEEE standards.
This calculator has been verified for accuracy by our team of experts and is reviewed monthly to ensure compliance with current regulations and industry standards.