From: Centuries Centuries Days [d] Decades Femtoseconds [fs] Fortnights Hours [h] Microseconds [μs] Millennia Milliseconds [ms] Minutes [min] Months (Common) Months (Synodic) Nanoseconds [ns] Picoseconds [ps] Quarters (Common) Seconds [s] Shakes Weeks Years (Common) [y] Years (Average Gregorian) Years (Julian) Years (Leap) Years (Tropical)

To: Centuries Centuries Days [d] Decades Femtoseconds [fs] Fortnights Hours [h] Microseconds [μs] Millennia Milliseconds [ms] Minutes [min] Months (Common) Months (Synodic) Nanoseconds [ns] Picoseconds [ps] Quarters (Common) Seconds [s] Shakes Weeks Years (Common) [y] Years (Average Gregorian) Years (Julian) Years (Leap) Years (Tropical)

Seconds ↔ Minutes

1 min = 60 s

Multiply by 60 or divide by 60

Minutes ↔ Hours

1 h = 60 min

Multiply by 60 or divide by 60

Hours ↔ Days

1 d = 24 h

Multiply by 24 or divide by 24

Days ↔ Weeks

1 week = 7 d

Multiply by 7 or divide by 7

💻 Programming & Development

Convert between milliseconds, seconds, and minutes for timeout functions, API calls, and performance monitoring. Essential for JavaScript setTimeout(), database queries, cache expiration, and benchmark testing. Calculate execution times and optimize code performance metrics.

📊 Project Management

Convert work hours to days, weeks to months, or calculate project durations across different time scales. Essential for sprint planning, resource allocation, deadline estimation, and milestone tracking. Translate between different planning horizons for stakeholder communication.

⏱️ Sports & Fitness

Convert race times, workout durations, or training schedules. Calculate pace conversions (minutes per kilometer), rest intervals, or total training volume. Essential for marathon training, interval workouts, or comparing athletic performance across different time formats.

🔬 Scientific Research

Convert between nanoseconds, microseconds, and seconds for physics experiments, chemical reactions, or biological processes. Essential for atomic physics, spectroscopy, and high-speed phenomena. Calculate time constants, decay rates, or reaction kinetics across scales.

✈️ Travel & Planning

Calculate flight durations, layover times, or vacation lengths in different units. Convert hours to days for trip planning, or minutes to hours for itinerary scheduling. Essential for travel agencies, airlines, and personal trip organization across time zones.

🎓 Education & Learning

Students use time converters for mathematics, physics, chemistry homework and exams. Understand time scale relationships, practice unit conversions, or verify calculations. Essential for science education, helping visualize time magnitudes from atomic to geological scales.

To convert seconds to hours, divide the number of seconds by 3,600. Formula: \( \text{hours} = \frac{\text{seconds}}{3600} \). Example: 7,200 seconds ÷ 3,600 = 2 hours. This works because there are 60 seconds in a minute and 60 minutes in an hour, so 60 × 60 = 3,600 seconds per hour.

One day contains 86,400 seconds. Calculation: 24 hours × 60 minutes × 60 seconds = 86,400 seconds. Formula: \( 1 \text{ day} = 24 \times 60 \times 60 = 86,400 \text{ s} \). This assumes a standard 24-hour day. Leap seconds occasionally added to keep atomic time synchronized with Earth's rotation.

A common year has 365 days while a leap year has 366 days. Leap years occur every 4 years (with exceptions for century years) to account for Earth's 365.24-day orbital period. The extra day (February 29) keeps our calendar synchronized with astronomical seasons. Common year = 31,536,000 seconds; leap year = 31,622,400 seconds.

To convert milliseconds to seconds, divide by 1,000. Formula: \( \text{seconds} = \frac{\text{milliseconds}}{1000} \). Example: 5,000 ms ÷ 1,000 = 5 seconds. "Milli" means one-thousandth, so one second equals 1,000 milliseconds. Common in programming timers, video editing, and digital systems timing.

A fortnight is 14 days or 2 weeks. The word comes from Old English "fēowertyne niht" meaning "fourteen nights." Commonly used in British English, Australia, and New Zealand for scheduling and wages. One fortnight equals 336 hours, 20,160 minutes, or 1,209,600 seconds. Useful for biweekly planning cycles.

Different year types account for Earth's complex motion. Common year (365 days) is calendar standard. Julian year (365.25 days) is simple astronomical average. Gregorian year (365.2425 days) matches calendar system accounting for leap year rules. Tropical year (365.242189 days) measures time between vernal equinoxes. Each serves specific astronomical, calendrical, or scientific purposes.