This day converter expresses one duration in seconds, minutes, hours, days, weeks, average Gregorian months, and average Gregorian years.
Conversion
Day Converter
Convert a duration between days and common time units using a 365.25-day year.
Calculator
About this calculator
Formula notes
seconds = input × selected-unit seconds; each output = seconds / output-unit seconds. One year is 365.25 days and one month is one twelfth of that year.
Worked examples
- Example: 14 days equals 1,209,600 seconds, 336 hours, 2 weeks, about 0.460 months, and about 0.0383 years.
- A duration of 400 days converts to 57.1429 weeks, about 13.1417 average months, and about 1.09514 average years.
How to use it
- Enter a nonnegative duration.
- Choose the unit attached to that value.
- Read the equivalent duration in every listed unit.
Frequently asked questions
Why is a month shown as 30.4375 days?
The calculator uses a 365.25-day average Gregorian year divided by 12, not a particular calendar month.
Can I use this for calendar deadlines?
Use a calendar-aware date calculator when actual month lengths, leap days, time zones, or daylight-saving changes matter.
Limits and interpretation
- Months and years are average-duration units here; the result does not reproduce the varying lengths of actual calendar months or leap-year date intervals.
- Very large values remain subject to JavaScript floating-point precision and displayed rounding, so avoid chaining conversions from rounded output.