Why does adding months give a different result than counting days?

Because months have different lengths (28–31 days). Six calendar months can be 181 to 184 days depending on which months they are. For legal or contractual purposes, always clarify whether "months" means calendar months or a specific number of days.

Days Between Dates Calculator

Calculate the exact number of days, weeks, months, and years between any two dates. Also shows weekday count only.

⚡ Quick Calculator Get a fast estimate

Start Date

End Date

Days Between Dates

439 days

Weeks + Days

62 weeks, 5 days

Months + Years

1 yrs, 2 months

Weekdays Only

313 working days

How to Use This Calculator

Enter a start date and end date. The calculator automatically puts the earlier date first and returns the total days, weeks + remaining days, approximate months and years, and the number of weekdays between the two dates.

The Extended Calculator below adds tabs for weeks, months, and working days with a timeline SVG. The Professional Calculator lets you exclude SA public holidays and specific custom dates, with batch mode for multiple ranges.

Need more detail?

📊 Extended Calculator More options, charts, and scenario comparison

Start Date

End Date

Total Calendar Days

90 days

Total Days

Working Days

Weekend Days

Full Weeks

Approx Months

2.96

Approx Years

0.25

Date Timeline

Days Calculation Formula

Total Days = (End Date − Start Date) in milliseconds ÷ 86,400,000 Weeks = Total Days ÷ 7 (integer part) Months ≈ (End Year − Start Year) × 12 + (End Month − Start Month)

The weekday count excludes Saturdays and Sundays. For a count that also excludes South African public holidays, use the Working Days Calculator.

Example

Project Duration

Project start: 1 March 2026. Project end: 31 August 2026.

Total calendar days: 183 days

Weeks: 26 weeks, 1 day

Months: 6 months

Weekdays only: approximately 131 working days

Need full precision?

🔬 Professional Calculator Complete parameters, sensitivity analysis, and detailed breakdown

Exclude weekendsExclude SA public holidaysBatch mode (multiple ranges)

Custom Excluded Dates

From Date

To Date

Counted Days

Total Calendar

Weekends Excluded

Holidays Excluded

Custom Excluded

Frequently Asked Questions

No. This calculator shows total calendar days and weekdays (Mon–Fri only). Working days exclude public holidays as well as weekends. For accurate working day calculations with SA public holidays excluded, use our Working Days Calculator which includes SA 2025 and 2026 public holidays.

Because months have different lengths (28–31 days). Six calendar months can be 181 to 184 days depending on which months they are. This is why month counts are approximate and day counts are exact. For legal or contractual purposes, always clarify whether "months" means calendar months or a specific number of days.

A regular year has 365 days. A leap year has 366 days. Leap years occur every 4 years (when the year is divisible by 4), except for years divisible by 100, which are not leap years unless also divisible by 400. For example: 2024 is a leap year, 2025 is not, 2100 will not be.

A typical South African year has approximately 261 weekdays (Mon–Fri), minus 12 public holidays = approximately 249 working days. This varies slightly as public holidays that fall on weekends are usually observed on the following Monday.