Days Between Dates Calculator
Find how many calendar days separate two dates. Enter a start and end date to get an instant result.
Enter dates to calculate.
Next step: Business Days Calculator
When to use this calculator
Use this calculator whenever you need every calendar day between two dates, including weekends—trip planning, countdowns, billing cycles, or any span where weekends should count toward the total.
Trip or event planning
Count the full calendar span between a booking date and a travel or event date.
Billing or subscription cycles
Check the exact calendar-day length of a billing period that includes weekends.
General countdowns
Find how many days remain until or have passed since a specific date.
Weekdays only instead
If weekends should not count, use the Business Days Calculator instead.
Inputs
Start date
The first date in the range.
End date
The second date in the range.
How the calculation works
This calculator measures the calendar-day difference between two dates using UTC, so results stay consistent regardless of your local time zone. Time of day is ignored; only the calendar date matters.
Weekends and holidays are not excluded. If you need working days only, use the Business Days Calculator. To shift a single date forward or backward, try Add or Subtract Days.
Worked example
Start date: 1 January 2025. End date: 3 January 2025.
Result: 2 calendar days apart (not 3)—the start date is day zero, and the end date is two days later.
For 28 February 2024 to 1 March 2024, the result is 2 days, since 2024 is a leap year and 29 February falls between them.
Edge cases
Same start and end date
Returns 0—no days separate a date from itself.
End before start
If the end date is earlier than the start date, the result is negative—the magnitude is still the calendar-day distance.
Spans crossing a leap day
A range that includes 29 February in a leap year is one day longer than the equivalent calendar range in a non-leap year.
Related Date & Business Days Calculators
The Business Days vs Calendar Days Guide explains when weekends and holidays count and which day type applies to deadlines, invoices, and contracts.
The How Business Days Are Calculated Guide and Business Days Between Dates Guide cover the counting rules behind every business-day tool on this site.
The Business Days Calculator and Working Days Calculator count weekdays between two known dates, excluding weekends and optional US federal holidays.
The Add Business Days To Date, Subtract Business Days From Date, and Business Day Offset calculators move a single date forward or backward by a business-day count.
The Business Days Until Date Calculator counts business days remaining from today or a custom date to a target deadline.
The Days Between Dates Calculator counts every calendar day between two dates, including weekends—use it instead of the business-day tools when weekends should count.
The Date Range Calculator and Date Duration Calculator break a range into calendar-day totals or a years/months/days breakdown, with inclusive or exclusive boundary options.
The Add or Subtract Days Calculator shifts a single date forward or backward by days, weeks, or months.
The Age Calculator applies the same calendar breakdown used by Date Duration to a birth date, expressed as years, months, and days.
The Hours Between Dates and Date Difference calculators measure elapsed time between two date-times down to hours, minutes, and seconds.
The Date Format Converter, Unix Timestamp Converter, and Timezone Converter handle format and zone conversion for a single instant rather than a span between two dates.
FAQ
- Are weekends included?
- Yes. This tool counts every calendar day in UTC. For Monday–Friday only, use the Business Days Calculator.
- Why does this use UTC?
- UTC avoids surprises when users are in different time zones. Two people anywhere in the world get the same day count for the same start and end dates.
- Is the start date included in the count?
- The count is the difference between dates, not inclusive of both endpoints. From Jan 1 to Jan 1 is 0 days; from Jan 1 to Jan 2 is 1 day.
- How is this different from the Date Range Calculator?
- This calculator gives a single day count between two dates. The Date Range Calculator adds explicit inclusive/exclusive boundary options and an optional business-day total for the same range.
Related Guides
- Date Calculation ReferenceA practical reference for calendar days, business days, date ranges, and which DateToolsHQ calculator fits each question.
- How to Count Days Between DatesStep-by-step guidance for counting days between two dates, inclusive vs exclusive rules, and using the days between dates calculator.
- How Prorated Rent Is CalculatedLearn how partial-month rent is estimated from monthly rent and move-in or move-out dates, and how to use the prorated rent calculator.
- Date Format GuideLearn the most common date format standards—ISO 8601, US, UK, Unix timestamps, and locale-specific patterns—and how to convert between them with DateToolsHQ.
Browse all Date & Business Days
Similar Tools
Popular Calculators
- Days Until CalculatorCount calendar days until any date—or days ago for past dates.
- Countdown To Date CalculatorCount down to any date with optional UTC time and event name.
- Invoice Due Date CalculatorCalculate invoice due dates from net payment terms with optional weekend adjustment.
- Notice Period CalculatorCalculate notice period end dates from a start date and length in days, weeks, or months (calendar or business days).
- Contract End Date CalculatorCalculate contract end dates and 30/60/90-day renewal reminders from a start date and term.