180 Days From Today
See the exact calendar date 180 days from today, or from any start date you enter (leave it blank for today). Results include the weekday, the 180-business-day date that skips weekends, and 180 days back.
180 calendar days is close to, but rarely equal to, 6 calendar months — six months from a date can be 181 to 184 days. The business-day row skips weekends only.
Where 180-day windows show up
Immigration and travel lean on 180 days constantly: many countries require a passport valid for six months beyond entry, and a standard US B-2 visitor admission runs up to 180 days. Banking and tax rules use it too — think of it as the law's working definition of half a year. Because 180 = 25 weeks + 5 days, the landing weekday advances five steps from your start day: a Tuesday start lands on a Sunday.
If your document says 180 business days, the wait balloons to 252 calendar days — 36 weeks — since only weekdays count. And note the calendar quirk: 180 days is usually a day or four short of six calendar months, because most half-year stretches contain several 31-day months.
How it’s calculated
Target = start + 180 days via new Date(y, m, d + 180), which rolls month and year boundaries and leap days exactly. Business-day variant advances day by day counting Mon-Fri until 180 are tallied (180 business days = 36 weeks = 252 calendar days). All dates pinned to noon to sidestep daylight-saving shifts.
Weekend-only exclusion in the business-day row; federal holidays still count as days.
Common 180-day rules of thumb
| Rule | Window | Basis |
|---|---|---|
| Passport six-month validity on entry | 180+ days remaining | Entry requirement of many countries; check the destination |
| US B-2 visitor admission | Up to 180 days | Typical CBP admission period; the stamp controls |
| Capital-gain holding period (long-term) | More than 1 year, not 180 days | IRS — a common mix-up |
| Half a mean year | 182.62 days | 365.2425 ÷ 2, slightly more than 180 |
Source: US CBP admission practice and common foreign entry rules; IRS holding-period definition; Gregorian mean year.
Common mistakes
- Treating 180 days as exactly 6 months — six calendar months from most dates is 181 to 184 days.
- Counting the start date as day 1 instead of day 0; deadlines usually start the clock the day after.
- Reading a 180-business-day term as 180 calendar days: the real span is about 252 calendar days.
- Ignoring leap years: a 180-day window crossing Feb 29 still counts it as one ordinary day.
Frequently asked questions
How is 180 days from today computed?
Target = start date + 180 calendar days, using date arithmetic that rolls months and years automatically (new Date(year, month, day + 180)). The start date is day 0.
Is 180 days the same as 6 months?
Not quite. Six calendar months keeps the same day-of-month half a year later, which is 181-184 days for most start dates. 180 days is a fixed count and usually lands a few days earlier.
What weekday will it be?
180 days = 25 weeks and 5 days, so the weekday advances five steps. Start on a Tuesday and you land on a Sunday; the result line shows the exact weekday for your date.
How long is 180 business days?
36 weeks, or 252 calendar days, counting Monday through Friday only. Any holidays inside the window would push a strict business-day deadline later still.