How this instrument works
This calculator counts forward exactly 90 calendar days from a start date you choose — today, by default — using the same civil-calendar arithmetic as the rest of this site's date tools, and returns the resulting date along with its day of the week.
Ninety days is a legally significant number for one well-known case: a K-1 fiancé visa is only valid for 90 days after the visa holder enters the United States, and the couple must marry within that window or the visa holder must leave the country. It's also a common, though not universal, length for a new employee's probationary period at many workplaces.
This tool only handles the date arithmetic — it can tell you exactly what calendar date is 90 days from your start date, but it doesn't know or advise on the specific legal or workplace rule you're applying it to. Always confirm the details of your actual deadline against the applicable visa document, contract, or policy.
- Enter the date the clock starts — for a K-1 visa, that's the date of entry into the U.S.
- Leave the day count at 90, or edit it for a different span.
- Read the resulting date and day of the week beneath the inputs — that's the deadline.
- Enter a negative day count to find a date 90 days before the start date instead of after.
Worked example — a K-1 visa 90-day marry-by deadline
A K-1 fiancé visa holder enters the United States on July 29, 2026. Federal rules require the marriage to take place within 90 days of that entry date. Enter 2026-07-29 as the start date and keep the day count at 90: the result is 2026-10-27, a Tuesday — the last calendar day the marriage can take place under the visa.
Starting instead from January 1, 2026, the same 90-day count lands on 2026-04-01, a Wednesday. This is date arithmetic only, not immigration advice — confirm the exact entry date and deadline against official USCIS or Department of State documentation before relying on it.
Questions
Is the K-1 visa's 90-day window calendar days or business days?
Calendar days — all 90 days count, including weekends and holidays, with the window starting on the date of entry into the United States. This calculator counts calendar days accordingly; always verify the exact entry date on your own immigration paperwork rather than assuming.
What happens if the marriage doesn't happen within 90 days on a K-1 visa?
The K-1 visa expires and generally cannot be extended, meaning the visa holder is expected to leave the United States. This calculator only performs the date arithmetic — for anything involving an actual immigration case, consult an immigration attorney or official USCIS guidance rather than relying on this page.
Is 90 days a legally required length for a job probationary period?
No — unlike the K-1 visa rule, there's no general legal requirement setting probation at 90 days. It's simply a common convention many U.S. employers use informally; the actual length, if any, depends entirely on your specific employer's policy or contract.
Can I use this for something other than a visa or job probation?
Yes — it's plain 90-day arithmetic and works for any deadline expressed that way, from certain warranty or return windows to project deadlines. The K-1 visa is simply the most legally precise, well-known reason people search for a 90-day calculator specifically.
Does this account for leap years?
Yes. The date arithmetic runs on the civil (Gregorian) calendar, so a leap day falling within the 90-day span is already included in the result.