Date Calculator

You get the last day of February — the 28th, or 29th in leap years. This is the standard clamping convention: adding months moves the same day-of-month forward, and when that day doesn't exist, it clamps to the month's final day rather than spilling into March. Excel, Google Sheets, and most legal interpretations of 'one month later' behave identically, which is exactly why this calculator does too.

It counts only Monday through Friday — 10 business days from a Wednesday lands two full weeks later, spanning 14 calendar days. What it deliberately doesn't skip: public holidays, because they differ by country, state, and even workplace. For holiday-sensitive deadlines, add roughly one extra day per holiday you know falls in the span, or check the specific rules — courts and contracts sometimes define 'business day' their own way.

Usually not, and the difference bites on real deadlines. Thirty days is exactly 30 calendar days; a month is the same day-of-month next month, which spans 28–31 days depending on where you start. A net-30 invoice dated January 15 is due February 14 (30 days), not February 15 (one month). When a contract says days, count days — this calculator's day mode is the safe interpretation.

Yes to both. Leap days are counted naturally — 365 days from Feb 28, 2027 crosses Feb 29, 2028 and lands accordingly — and because the math works in calendar dates rather than raw hours, daylight-saving transitions can't shift a result to the wrong day the way naive 24-hour arithmetic sometimes does. Dates compute in your local calendar.