Time
24h
AM/PM
Convert time units between seconds, minutes, hours, days, weeks, months and years. Useful for project planning, programming and everyday time calculations.
Frequently asked questions
A day has 24 hours × 60 minutes × 60 seconds = 86,400 seconds. A week has 604,800 seconds and a standard year has 31,536,000 seconds.
A standard year has 365 days, equating to 52 weeks and 1 day. A leap year has 366 days (52 weeks and 2 days). Leap years occur every four years to keep the calendar year aligned with the astronomical year.
It depends on the month: February has 28 days (2,419,200 seconds) or 29 in a leap year; April, June, September and November have 30 days (2,592,000 seconds); the remaining months have 31 days (2,678,400 seconds).
A millisecond (ms) is one-thousandth of a second (10⁻³ s). A microsecond (μs) is one-millionth of a second (10⁻⁶ s). Milliseconds are used in networking and audio; microseconds in electronics and processors.