Business Day Counter
Counts working days between dates, or finds the date N working days out, excluding weekends and holidays.
Working days between two dates, or the date a given number of working days out. Weekends and Korean public holidays come off, including the substitute days, so the answer is the one a contract or a filing deadline actually runs on.
How many working days from one date to another.
Working days
Working days
0
Calendar days
0
Weekend days
0
Public holidays
0
How to use it
Choose which question you are asking
Counting between two dates, or projecting a deadline N working days out. They are different calculations and the second is the one people usually want.
Say which days are not working days
Saturday and Sunday by default, but a six-day week and a Friday–Saturday weekend are both real arrangements and both selectable.
Check the holidays it found
The holidays inside your range are listed by name, so you can see exactly which days came off rather than trusting a total.
Common questions
Does the start date count as day one?
No. Counting between dates gives the working days that pass, so Monday to Tuesday is one. For a deadline, N working days out from Monday with N = 1 is Tuesday.
Are 대체공휴일 included?
Yes, computed from the rule rather than from a list, so it stays right for future years. 임시공휴일 are not — they are declared by decree and there is nothing to compute.
Can I count backwards?
Yes — a negative count goes back, which is how you find the last date to file something so that it lands N working days before a deadline.
Feed it from
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Date Add & Subtract
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Gantt Chart Builder
Turns a task table — typed in or pasted as CSV — into a Gantt chart on a day, week or month scale with dependency arrows, milestones, a today line and weekend shading, exported as SVG or PNG or printed.
Next
These accept what this tool produces, so the result can go straight in.
Date Add & Subtract
Adds or subtracts days, weeks, months or years from a date, optionally skipping weekends and holidays.
Date Difference
Counts days, weeks, months and years between two dates, with a D-day view and business-day option.
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Works out how many paid leave days have accrued by joining date or fiscal year, including the first-year rule.
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Lists public holidays and substitute holidays for a year, including the lunar-dated ones, as a calendar or ICS.
CSV Viewer
Opens a large delimited file with type detection, column stats and sorting, without loading it all into memory.
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Converts between about thirty currencies at the ECB’s daily reference rates, crossed through the euro, or at a rate you type in.