Enter a duration and select its units. Seconds, minutes, hours, days and weeks use fixed multiples. The year option is explicitly a Julian year of 365.25 days, or 31,557,600 seconds.
It does not represent every calendar year. Months are omitted because their lengths depend on the dates concerned; use a date-difference tool for a calendar interval.
Time Converter: worked example
| Time to convert | 90 |
|---|---|
| Starting unit | Minutes |
| Requested unit | Hours |
| Converted value | 1.5 |
| 1 unit of "from" in "to" units | 0.017 |
Time Converter: formula
Common error: Treating a month as 30 days everywhere. Months run from 28 to 31, and this converter leaves them out on purpose for that reason.
A fixed unit conversion does not resolve time zones, daylight-saving transitions, leap seconds or calendar anniversaries. A civil day can span a different number of elapsed hours across a clock change. The selected day here remains 86,400 seconds.
For a video duration or measured timer interval, fixed seconds are appropriate; for an appointment interval, use dated instants with a specified zone.
Time Converter: changing Time to convert
| Time to convert | Converted value | 1 unit of "from" in "to" units |
|---|---|---|
| 72 | 1.2 | 0.017 |
| 81 | 1.4 | 0.017 |
| 90 (example) | 1.5 | 0.017 |
| 99 | 1.7 | 0.017 |
| 108 | 1.8 | 0.017 |
Time Converter: compare input ranges
| Input | Tested from | To | Converted value: low input | Converted value: high input | Swing |
|---|---|---|---|---|---|
| Requested unit | Seconds | Years (365.25 days) | 5,400 | 0.00017 | 5,400 (360000%) |
| Starting unit | Seconds | Years (365.25 days) | 0.025 | 788,940 | 788,940 (52595998%) |
| Time to convert | 81 | 99 | 1.4 | 1.7 | 0.3 (20%) |
Time Converter: individual input comparisons
| Input | Value | Converted value | 1 unit of "from" in "to" units |
|---|---|---|---|
| Time to convert | 72 | 1.2 | 0.017 |
| 81 | 1.4 | 0.017 | |
| 90 | 1.5 | 0.017 | |
| 99 | 1.7 | 0.017 | |
| 108 | 1.8 | 0.017 | |
| Starting unit | Seconds | 0.025 | 0.00028 |
| Minutes | 1.5 | 0.017 | |
| Hours | 90 | 1 | |
| Days | 2,160 | 24 | |
| Weeks | 15,120 | 168 | |
| Years (365.25 days) | 788,940 | 8,766 | |
| Requested unit | Seconds | 5,400 | 60 |
| Minutes | 90 | 1 | |
| Hours | 1.5 | 0.017 | |
| Days | 0.063 | 0.00069 | |
| Weeks | 0.00893 | 0.0001 | |
| Years (365.25 days) | 0.00017 | 0 |
Time Converter: which assumptions move the result?
Time Converter: values and definitions
| Quantity and definition | Value used |
|---|---|
| Time to convert | 90 |
| Starting unit — Unit to convert from. | Minutes |
| Requested unit — Unit to convert to. | Hours |
| Converted value | 1.5 |
| 1 unit of "from" in "to" units | 0.017 |
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Ten Julian years equal 315,576,000 seconds. Dividing by the fixed 604,800-second week gives about 521.7857 weeks; that duration conversion does not identify an anniversary date. A calendar interval is different: the Julian-calendar average is 365.25 days, while Gregorian century exceptions produce a long-run mean of 365.2425 days, and an interval between actual dates depends on which leap days it contains.
A day contains 86,400 seconds and a week contains 604,800. Ninety minutes is one and a half hours; 1,440 minutes make a day.
Decide whether you want a calendar year or an average one. For a contract term, count actual dates instead.
Convert hours and minutes to decimals on the hours to decimal calculator, find the gap between times on the time duration page, and count days on the date difference calculator. The speed and frequency converters combine time with distance and cycles.
Does the year choice include leap years?
It uses a fixed 365.25-day Julian year. It does not inspect which calendar year was intended and is not the Gregorian calendar’s long-run mean.
How do I enter one hour thirty minutes?
Enter 90 minutes or 1.5 hours. Entering 1.30 hours means one hour and eighteen minutes, a different duration.
How many seconds are in a day?
The duration unit used here is 24 hours, or 86,400 seconds. Calendar days are a different question. Local clock intervals can change with daylight-saving transitions, so use date-and-time rules rather than a fixed duration multiplier when measuring elapsed time between local timestamps.
How many hours are in a year?
8,760 in a common year of 365 days, and 8,784 in a leap year.
Why is a month not a unit here?
Because months have different lengths, so converting to or from them needs a specific calendar date.