Date Calculator

Calculate days between dates or add/subtract a date

Use elapsed days, inclusive days, weeks plus days, and calendar offsets without business-day or holiday assumptions.

• Compare a start and end date with elapsed and inclusive day counts
• Add or subtract days, weeks, months, and years from a date
• Use Workday Calculator when weekends or Korean holidays should be excluded

Plan deadlines and date offsets with calendar-day math

Use the same page for countdown-style date gaps and future or past date offsets when weekends and holidays should still count.

• Check days until a deadline, anniversary, trip, renewal, or launch
• Move a date forward or backward by days, weeks, months, and years
• Keep business-day rules out of the result unless you switch to Workday Calculator

Calendar days, not business days

Date Calculator uses plain calendar math. Business-day and holiday calculations stay in Workday Calculator so each tool remains clear.