Number of workdays calculator
Count the number of days from Monday to Friday within the period and exclude holidays entered manually.
Input
The example value has been entered. Check it immediately or change the value.
Input is processed in the browser. Refreshing returns a sample value.
Result
Check or change the value using the example value result.
Official holidays are not applied automatically. Enter required holidays manually. Maximum duration is 10 years.
Share result
Share the tool link and result text together. No URL is included in the result. Check the below content and then share it.
Calculation·conversion criteria
Calculate the number of weekdays excluding weekends and designated holidays during the period.
Input example
2026-10-02 to 12: If no input, it’s a regular weekday with 7 days
From Monday, October 5, 2026, through Sunday, October 11, the standard workweek has 5 weekdays. Excluding October 9 leaves 4 days. Apply actual holidays manually.
How to use
- Use the entered example value or change the start date, end date, and excluded date (YYYY-MM-DD, one per line) items.
- Click Verify result and check the following result.
- Result can be copied if needed.
Frequently Asked Questions
Do Korean legal holidays and substitute holidays automatically exclude each other?
Does not disable automatically. Exclude Saturday and Sunday by default; enter holidays, company holidays, and personal holidays by date. Start and end dates are included if they meet the conditions.
If you enter a weekend exclusion date, will it be missed twice?
No. Weekends and exclusion lists are checked together with each date, so no days are subtracted due to duplicate input or weekend exclusion.
Calculation criteria and reference materials
The calculation formula and scope of this tool are disclosed in the above description. Examples can be checked by substituting input values into the formula or following the specified string and calendar handling rules.
Verification of calculation criteria: · Calculation·verification principles · Report errors