Should the start date count?
There are two ways to count the days between dates. The convention depends on the situation, so check and choose.
- Exclude the start date: 1 October to 3 October is 2 days. The simple date difference, used for ordinary period calculations and for periods under Korea’s Civil Act (the first day is not counted).
- Include both ends: 1 October to 3 October is 3 days. Used when the first day counts as a day, as with a trip (3 days, 2 nights), days of employment or days of leave.
Examples
Excluding the start date: 289 days (9 months 16 days, 41 weeks 2 days), of which 207 are weekdays and 82 are weekend days.
Including both ends: 290 days. Used when the first day counts too, as for days of employment or leave.
Korea’s Civil Act excludes the first day when counting periods, so if you received notice on 17 October, count 30 days from the next day: 16 November is the last day. That matches entering 30 in the N-days-after calculator. If the last day falls on a Saturday or public holiday, it moves to the following day.
Handy for
- Checking when a contract or probation period ends
- Finding a date some days ahead, such as a due date or when to start baby food
- Counting the weekdays left until a project deadline
- Finding the last day of a “within 30 days of notice” deadline
Frequently asked questions
Are public holidays excluded from the weekday count?
No. This calculator only treats Saturdays and Sundays as weekend days. If the period includes holidays such as Lunar New Year, Chuseok or substitute holidays, subtract them yourself.
How are “months and days” calculated?
Each time the same day of the month comes round from the start date counts as one month. If the next month has no such day, as with 31 January, the last day of that month is used.