Time & Date Calculators
Days between dates, +/- X days from today, business days calculators, and elapsed time calculators.
- Date Calculator: Find exact days between two dates, or add/subtract days from any date to find deadlines, milestones, and expiration dates.
Frequently asked questions
How do date calculators account for leap years and month lengths?
Date calculators use deterministic UTC calendar arithmetic that accounts for 28-day or 29-day Februaries, alternating 30-day and 31-day months, and quadrennial leap year rules. This guarantees exact calendar day offsets without daylight saving time drift.
What is the difference between calendar days and business days?
Calendar days count every consecutive 24-hour day including weekends and federal holidays, whereas business days strictly count Monday through Friday working days. A 10-business-day deadline typically spans 14 to 16 calendar days.
How do I calculate what date will be 90 days from today?
To calculate 90 days from today, advance the calendar day count by 90 consecutive days using the date calculator, which handles month transitions and leap years automatically. In standard legal and contract terms, 90 days is approximately three calendar months.