Calculate differences, deadlines, and working days with precision.
Noticed an issue or the calculator isn't working as expected? Contact us — we'd love to help!
Frequently Asked Questions (FAQ)
Calendar days count every day of the week, including weekends and public holidays. Working days count only Monday through Friday, excluding weekends. If you also add custom holidays, those dates are excluded too.
When this option is checked, the start date itself counts as Day 1. For example, if you start on Monday and add 5 working days with this option enabled, the result is Friday of the same week. Without it, counting begins from the next day, so the result would be Monday of the following week.
When you are calculating in working-days mode, you can choose how to handle this edge case. "Next working day (Monday)" skips the weekend entirely and starts counting from Monday. "Next calendar day (Saturday)" keeps the original date and simply skips Saturday and Sunday as they are encountered during the count.
Yes. Use the "Custom Holidays" field and select as many dates as you need using the date picker. All selected dates will be treated as non-working days and excluded from the working-days count, regardless of whether they fall on a weekday.
The exact breakdown uses PHP's native DateInterval, which accounts for varying month lengths and leap years. For example, 1 year, 2 months, and 15 days means exactly that calendar distance between the two dates, not an approximation.
The "Months" figure shown in the summary is calculated by dividing the total number of calendar days by the average month length of 30.44 days. It is rounded to one decimal place and is useful for a quick overview, while the exact breakdown gives the precise figure.
Yes. Simply enter a negative value in the "Days to Add / Subtract" field — for example, -14 — and the calculator will go back in time from the base date, applying all the same rules for working days and holidays.
There is no hard limit. The calculator relies on PHP's DateTime class, which supports dates from year 1 to year 9999. However, very large ranges in working-days mode may take slightly longer to compute because the calculator iterates day by day.
The calculator gives a mathematically correct result based on the inputs you provide. For official legal deadlines, always verify with the applicable legislation or a qualified professional, as rules for counting days may vary by jurisdiction.
After the calculation is complete, a "Copy Result" button appears next to the result card. Clicking it copies all result data to your clipboard as plain text, ready to paste into a document, email, or spreadsheet.