How to use it
Choose Add or subtract days to find a due date, such as "10 business days after the order date". Choose Count between two dates to find how many working days a project or delivery window has. Pick which days of the week are days off, and list any public holidays that apply as dates like 2026-12-25, one per line. Your list is saved on this device, so you only type it once.
How the counting works
The start day is never counted, so one business day after a Friday is the next Monday, and Monday to the following Monday is 5 business days. When you count between two dates, the second date is included if it is a working day. A holiday that falls on a weekend isn’t counted twice, and it doesn’t push the date to the next week the way some employers observe it. If your workplace moves a Saturday holiday to Friday, list the Friday.
Questions
Does it know public holidays? No, holidays differ by country, state and employer, so you list the ones that matter to you. Can I use a Friday–Saturday weekend? Yes, pick it under "Days off each week", or choose "No weekend" to count every day. Does daylight saving time change the result? No. Dates are counted as whole calendar days. For other date questions try the Age & Date Calculator.