Days Between Dates
Calculate the exact number of days, weeks, months, and years between any two dates. Our calculator handles all calendar complexities, including leap years, to provide accurate results for both personal and professional use.
How We Calculate Days Between Dates
Our calculator provides precise results through timestamp-based calculations that account for varying month lengths (28-31 days) and lap years. Business days are calculated by excluding weekends (Saturdays and Sundays) and counting only Monday through Friday.
Read more about our calculation methods below.
Notable Time Spans in History
Moon Landing Journey
From President Kennedy's famous moon speech (September 12, 1962) to the Apollo 11 landing (July 20, 1969) were 2,502 days. This historic period transformed space exploration forever.
Building the Statue of Liberty
Construction of the Statue of Liberty took 2,185 days, from start (October 28, 1886) to completion (October 28, 1886). This iconic symbol of freedom was a gift from France to America.
World War II in Europe
From Germany's invasion of Poland (September 1, 1939) to V-E Day (May 8, 1945) were 2,075 days. This period reshaped the modern world and international relations.
Golden Gate Bridge
The construction of the Golden Gate Bridge took 1,604 days, beginning January 5, 1933, and completing May 27, 1937. It remains one of the world's most famous bridges.
Great Wall of China
The most intensive period of the Great Wall's construction during the Ming Dynasty lasted 4,745 days (from 1474 to 1487). This section remains one of the best-preserved parts today.
Writing War and Peace
Leo Tolstoy spent approximately 730 days writing "War and Peace" (1865-1867). This masterpiece of literature contains over 580,000 words across its epic narrative.
Easter Island Statues
The main period of statue carving on Easter Island lasted about 3,650 days (1250-1260 CE). During this time, hundreds of the iconic moai statues were carved from volcanic rock.
Sistine Chapel Ceiling
Michelangelo painted the Sistine Chapel ceiling in just 547 days (1508-1512), working in extremely uncomfortable conditions to create one of history's greatest artistic achievements.
Days Between Dates Calculator
This online tool calculates the time between two dates, providing results in multiple formats. It accounts for leap years and varying month lengths automatically. You can calculate both future dates (time until an event) and past dates (time elapsed since an event).
Key Features that Make Our Calculator Stand Out:
Calculate total days between dates
Show working days (excluding weekends)
Convert results to weeks and months
Display years, months, and days breakdown
Account for leap years automatically
Calculating the exact time between two dates can be surprisingly complex, especially when you need to account for different month lengths, leap years, and various time units. Our online days between dates calculator is designed to take away all that complexity, giving you instant, accurate results for any two dates you choose.
Planning a special event, tracking a project timeline, or simply curious about a specific time span? Our calculator provides precise results in seconds. From counting down the days to your wedding, calculating the duration of a contract, to finding out how many days you’ve been alive, our tool is here to help.
Understanding How Date Calculations Work
🗓️
Behind the scenes, date calculations are more intricate than they might appear. Our calculator takes into account the varying lengths of months throughout the year, which can range from 28 to 31 days. It also automatically adjusts for leap years, which occur every four years and add an extra day to February. This means you don't have to worry about manually counting days or making adjustments for these calendar irregularities.
To count days between dates accurately, our calculator works by converting your chosen dates into timestamps, then calculating the precise difference between them. This ensures accuracy whether you're measuring a span of a few days or many years. The result is then converted back into a format that's easy to understand, showing you the time span in various units including days, weeks, and months.
Including and Excluding the Last Day
✅
Our calculator provices the days between two dates both including or excluding the last day. We do this to meet different user expectations.
Excluding the Last Day
This option is commonly used in technical and mathematical calculations. By excluding
the final day, the calculator only counts full days between the start and end dates.
This is often the standard approach in programming, analysis, and date-related calculations.
Including the Last Day
For practical or everyday uses, many people find it more intuitive to include both
the starting and ending dates in their calculation. This approach can be helpful for
event planning, travel arrangements, or situations where both days are considered
part of the overall period.
Providing both options allows you to choose the most appropriate method based on your needs, whether technical or practical.
Working with Different Time Spans
⏳
Different situations call for different ways of expressing time spans. Sometimes you might want to know the exact number of days between two dates. Other times, you might prefer to see the span expressed in weeks and days, or months and days. Our calculator provides all these options automatically.
Practical Applications
🔧
The uses for a date calculator are nearly endless. Parents might use it to track their baby's age in days. Project managers can calculate precise project durations or deadline spans. Teachers might use it to count the days left in a school term. Businesses often need it for calculating contract periods or time between payments. Even historians can benefit from calculating the spans between significant historical events.
Past and Future Calculations
📅
Our calculator is equally adept at measuring time spans in both directions. When using our calculator, the date you enter as your start date can be either in the past or future - it doesn't matter which comes first. The calculator will automatically determine the duration between the dates regardless of their order.
The calculator works with any combination of dates - both dates can be in the past, both can be in the future, or you can mix past and future dates. This flexibility allows you to calculate time spans across any period you're interested in.
For example, you might want to know how many days have elapsed since a significant historical event, your birth date, or any other important moment in history. Or you may need to plan ahead and count down to special occasions, manage project timelines, or track payment deadlines. The calculator handles all these scenarios with equal precision.
Technical Details and Accuracy
🔍
Our calculator uses precise algorithms to ensure accuracy across any date range. It follows the rules of the Gregorian calendar, which has been the standard calendar system in most of the world for over 400 years. The calculator can handle dates far into the past or future, though for historical dates before the adoption of the Gregorian calendar, you may want to consider the calendar system in use at that time.
For those interested in the technical aspects, the calculator represents dates internally as timestamps, allowing for precise calculations down to the day. This means you can trust the results for everything from short-term planning to long-range historical calculations.
Calculate Days Between Dates in Spreadsheets
If you need to calculate the number of days between two dates in Excel or Google Sheets, you can use built-in date functions. In Excel, use the DATEDIF function, while in Google Sheets you can use either DATEDIF or simple subtraction. Here's how:
For Excel:
DATEDIF(start_date, end_date, "d")
For Google Sheets:
DATEDIF(start_date, end_date, "D")
These formulas will return the number of days between the two dates. In Excel and Google Sheets' DATEDIF, you can replace "d"/"D" with "m"/"M" to calculate months, or "y"/"Y" to calculate years between dates.
Privacy and Security
🔒
We understand the importance of data privacy in today's digital world. Rest assured that our calculator processes all date calculations directly in your browser. We don't store any of the dates you enter or track your calculations. You can use the calculator as many times as you need with complete confidence in your privacy.