Use the Date Difference tab in the calculator above. Enter your start date and end date then click Calculate Date Difference. The result shows the exact number of calendar days, business days, complete weeks, complete months, and complete years between the two dates. For a dedicated date difference tool, visit our date difference calculator.

Use the Add / Subtract tab above. Enter your start date, type the number of days in the Amount field, select "Days" as the unit, choose the Forward direction, then click Calculate Date. The result is the exact date that falls N calendar days after your chosen start date. For quick access, visit days from today (anchored to today) or days from date (any anchor date).

Thirty days from today is —. This is one of the most frequently searched date calculations — used in notice periods, payment terms, return windows, and contract deadlines. Visit the dedicated 30 days from today page for a full breakdown including day of week, business days in the period, and real-world use cases.

Ninety days from today is —. 90 days is a commonly used interval for quarterly planning, Schengen visa stay limits, legal response windows, and probationary periods. Visit the dedicated 90 days from today page for a live daily-updated result and full breakdown.

Calendar days count every day — Monday through Sunday including weekends and public holidays. Business days (also called working days) count only Monday through Friday, skipping Saturday and Sunday. A 30-calendar-day period and a 30-business-day period are very different: 30 calendar days spans approximately 4 weeks and 2 days, while 30 business days spans approximately 6 full calendar weeks (42 days). Always check whether a contract, law, or deadline specifies calendar days or business days. Our business days calculator handles both counting and adding business days.

No. 30 calendar days and 1 calendar month are different units. Adding 30 days always moves exactly 30 days forward regardless of the month. Adding 1 month advances the month number by one while keeping the same day of the month — which may span 28, 29, 30, or 31 calendar days depending on which month it crosses. For example: 30 days from January 1 = January 31, but 1 month from January 1 = February 1. For month-based calculations use our months from today calculator.

Leap years add an extra day — February 29 — to the calendar approximately every four years (with century exceptions). This affects date calculations in two ways: first, any day count that crosses a February 29 is one day longer than the same period in a non-leap year; second, adding years to a February 29 date lands on February 28 if the target year is not a leap year. All calculators on this site apply the full Gregorian leap year rule — divisible by 4, except century years which must also be divisible by 400 — automatically. So 2000 was a leap year but 2100 will not be.

Ninety days ago from today was —. Use the Add / Subtract tab above and choose Backward direction, or visit our dedicated 90 days ago from today page for a live result with full breakdown.

Use the Add / Subtract tab above: enter today as the start date, enter your week count as the amount, select "Weeks" as the unit, and click Calculate Date. One week always equals exactly 7 calendar days — unlike months and years, weeks have a fixed length. For quick access visit our weeks from today calculator which has dedicated pages for 1 through 104 weeks.

Use the Add / Subtract tab above: enter your anchor date, enter the number of business days as the amount, select "Business Days" as the unit, and click Calculate Date. The result skips all Saturdays and Sundays automatically. For a dedicated tool with full business day features including a count mode and start/end inclusion toggles, visit our business days calculator. Note that public holidays are not excluded — only weekends are skipped.