A(z) Add or Subtract Days from Date kiszámítása
Mi az a Add or Subtract Days from Date?
An add or subtract dates calculator computes a new date by adding or subtracting a specified number of days, weeks, or months from a starting date. Used for deadlines, scheduling, and date planning.
Képlet
result_date = start_date ± days (accounting for month/year boundaries)
- start
- Start date (date) — Base date (YYYY-MM-DD)
- days
- Days to add/subtract (days) — Positive = future, negative = past
- result
- Result date (date) — The calculated date
Útmutató lépésről lépésre
- 1For days: add/subtract directly from the date
- 2For weeks: multiply by 7 then add/subtract days
- 3For months: adjust the month field and handle month-end overflow
- 4JavaScript Date handles leap years automatically
Worked Examples
Bemenet
Jan 15 + 90 days
Eredmény
April 15 (or 16 in leap year)
Bemenet
Mar 31 + 1 month
Eredmény
April 30 (month-end handling)
Bemenet
Today − 30 days
Eredmény
Date 30 days ago
Frequently Asked Questions
How does the calculator handle month boundaries?
It automatically adjusts for varying month lengths and leap years. Adding 30 days to Jan 1 correctly lands on Jan 31.
Can I subtract dates to go backward in time?
Yes, use a negative number. Subtracting 10 days from Mar 15 = Mar 5. The calculator respects month/year boundaries.
What about leap seconds or daylight saving?
Calendar calculations ignore leap seconds and DST. They operate on calendar dates, not absolute time.
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