Date Calculator

Calculate difference in milliseconds, then divide by milliseconds per day (86,400,000). Example: Jan 1, 2024 to March 1, 2024 = 60 days (includes leap day). Accounts for leap years automatically. Use cases: Project timelines, vacation planning, countdown to events, age of something, billing periods, contract durations. Calculator provides days, weeks, months, and years for convenience.

Workdays = Total days x 5/7 (rough estimate, excluding weekends). Example: 30 calendar days ≈ 21-22 workdays. This is approximate - doesn't account for holidays. For accurate count: Exclude Saturdays, Sundays, and public holidays. Use: Project planning, business days for delivery, work hours calculation. Standard work year = ~260 days (52 weeks x 5 days - holidays).

Months have varying lengths (28-31 days), so exact month count depends on specific dates. Calculator uses average month = 30.44 days (365.25 / 12). Example: 60 days ≈ 2 months, but could be 1.9 or 2.1 depending on months involved. For precise monthly intervals, use years + months calculation (like age calculator). Days and weeks are always exact.

Enter today as start date and future date as end date. Example: Today is March 20, 2024, Christmas is Dec 25, 2024 = 280 days away = 40 weeks = 9.2 months. Use for: Event countdowns, deadline tracking, goal setting, vacation planning. Can also calculate backwards (days since past event) using past date as start, today as end.