Time & Dates
Date Calculator
Compare two dates, add or subtract time, count business days with custom weekends and holidays, and get weekday, ISO week number, day-of-year, and quarter details.
Date Differences, Shifts, Business Days, and Calendar Details
Use calendar-accurate math that respects month lengths and leap years, with options for inclusive counting and custom workweeks.
Calendar difference is shown in years, months, and days. Totals are shown as raw counts (days, weeks, hours) for quick planning.
Adding months or years keeps the same day-of-month when possible and clamps to the last day of the target month when needed (for example, Jan 31 + 1 month).
Business days exclude weekends based on your selected pattern and exclude any holiday dates you provide that fall within the range.
Get weekday, ISO week number, day-of-year, quarter, and useful year milestones. Optionally compare the selected date to another date.