Add or subtract days, weeks, months, or years from any date.
Temporal Limits
Difference
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About this calculator
Overview
Date calculations help determine future or past dates for planning, contracts, and deadlines. Accounting for leap years and varying month lengths ensures accuracy. Essential for project management and legal documents.
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Pro Tips
Months have 28-31 days; use date libraries for accuracy.
Leap years occur every 4 years (except century years not divisible by 400).
Business days exclude weekends and holidays.
90 days from a date isn't always 3 calendar months.
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Fun Facts
"Gregorian calendar has 365.2425 days average (leap year rules)."
"February has 29 days in leap years (2024, 2028, 2032)."
"ISO 8601 is the international date format standard (YYYY-MM-DD)."
"Unix epoch time started January 1, 1970."
Formula: New Date = Original Date ± Time Period (adjust for month/year boundaries)
