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Time
This category is for questions about the methods humans go about measuring the passage of time. You can also find questions about converting one unit of time to another.
9,511 Questions
How many minutes Difference is there between 4.15 hours and 3.85 hours?
4.15 hours is 4 hours and 9 minutes. 3.85 hours is 3 hours and 51 minutes. The difference is 24 minutes.
How many hours 1230 hours one day until 0620 hours the next?
To calculate the hours from 1230 hours (12:30 PM) one day until 0620 hours (6:20 AM) the next day, you first count the hours remaining in the day from 12:30 PM to midnight, which is 11.5 hours. Then, you add the 6 hours and 20 minutes from midnight to 6:20 AM the next day. In total, that gives you 11.5 + 6.33 = approximately 17.83 hours, or 17 hours and 50 minutes.
How many days are exactly in a year?
The earth year changes every year so only a mean value can be given.
It also depends upon which year you mean.
In 2000 AD the mean time interval of a year was:
Sidereal (orbit to same place in space): 365.2564 days
Tropical (orbit to same time in space): 365.24219 days
Between two March equinoxes: 365.24237 days
Between two June solstices: 365.24162 days
Between two September equinoxes: 365.24201 days
Between two December solstices: 365.24274 days
Atomic clock year: approx 290,091,200,500,000,000 oscillations of cesium (or 365.2422 days).
It is because it is slightly short of 365.25 days, that the Gregorian calendar only makes centuries leap years if the year is divisible by 400 to correct for this.
As the atomic clock is more accurate than the earth rotation, leap seconds are added every so often to allow for the earth's rotation which is gradually slowing down.
There will be 2160, 2184 or 2208 depending on which months.
How many hours from 10 am to 7am?
It is 21 hours.
Note: 10 am to 10 pm is 12 hours, 10 pm to 7 am is 9 hours, 12 + 9 = 21
When it's 1300 CET what time is it in Chicago?
1300 CET = 0600 CST (early Nov. to mid-March) = 0700 CDT (mid-March to early Nov.)
How many hours is it from 830 to 1210?
three hours forty minutes
12:10 - 08:30 = 03:40
unless 12 hours later then 15:40
1 hour = 60 minutes.
90% (or 0.9) of 60 minutes = 54 minutes.
