Common Additions From Today
Add 90 Days to a Date
90 days is commonly used for probation periods, insurance claims, warranty periods, and government processing deadlines. 90 calendar days is about 3 months. 90 business days is about 4.5 months (roughly 18 weeks).
Add 30 Days to a Date
30 days appears in payment terms (Net 30), benefits enrollment windows, cancellation notice periods, and return policies. 30 business days is about 6 calendar weeks.
Add 60 Days to a Date
60 days is used for SEC filing deadlines, employee review periods, escrow timelines, and COBRA enrollment windows. 60 business days is about 12 calendar weeks.
Add 45 Days to a Date
45 days is common in mortgage processing, 1031 exchange identification periods, and insurance claim resolutions. 45 business days is about 9 calendar weeks.
Add 120 Days to a Date
120 days appears in patent filing deadlines, FDA review periods, and long-term project milestones. 120 business days is about 24 calendar weeks (nearly 6 months).
The difference matters more than most people realize:
| Days Added | Calendar Days Result | Business Days Result |
|---|---|---|
| 30 | 30 days (~4 weeks) | 42 days (~6 weeks) |
| 60 | 60 days (~8.5 weeks) | 84 days (~12 weeks) |
| 90 | 90 days (~13 weeks) | 126 days (~18 weeks) |
| 120 | 120 days (~17 weeks) | 168 days (~24 weeks) |
Business day counts stretch even further when public holidays fall within the period. A 90-business-day deadline set in November could extend past the following April due to Thanksgiving, Christmas, New Year's, and MLK Day.
How does this calculator work?
Enter a start date, choose the number of days to add, and select whether you want business days (excludes weekends and holidays) or calendar days (counts every day). The calculator skips weekends (Saturday and Sunday) and public holidays for your selected country when counting business days.
Does Day 1 start on the start date or the day after?
The count starts on the day after the start date. If you enter June 1 and add 1 business day, the result is June 2 (assuming it's a weekday and not a holiday). This matches how most legal and business contracts count days.
Which holidays are excluded?
The calculator uses the major public/federal holidays for the selected country. For the US, this includes New Year's Day, MLK Day, Presidents' Day, Memorial Day, Juneteenth, Independence Day, Labor Day, Columbus Day, Veterans Day, Thanksgiving, and Christmas. Other countries use their respective national holidays.
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