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18 Hours From Now
18 Hours From Now – An hour is a unit of time conventionally reckoned as 1⁄24 of a day and scientifically reckoned between 3,599 and 3,601 seconds, depending on the speed of Earth’s rotation. There are 60 minutes in an hour, and 24 hours in a day. Hipparchus, whose work primarily took place between 147 and 127 B.C., proposed dividing the day into 24 equinoctial hours, based on the 12 hours of daylight and 12 hours of darkness observed on equinox days.
How Was Time Decided?
According to archaeological evidence, the Babylonians and Egyptians began to measure time at least 5,000 years ago, introducing calendars to organize and coordinate communal activities and public events, to schedule the shipment of goods and, in particular, to regulate cycles of planting and harvesting.
The measurement of time began with the invention of sundials in ancient Egypt some time prior to 1500 B.C. However, the time the Egyptians measured was not the same as the time today’s clocks measure. For the Egyptians, and indeed for a further three millennia, the basic unit of time was the period of daylight.
The standard units of time are
 1 hour = 60 minutes
 1 minute = 60 seconds
 1 hour = 60 minutes = 3600 seconds (60 × 60)
 1 day = 24 hours
 1 week = 7 days
 1 year = 365 days
 1 year = 12 months
 1 year = 52 weeks
Calculate the duration between two times
Calculating the duration between two times can be a little tricky depending on the numbers of minutes and seconds in the two times being compared. As an example, the following are the steps to determine the number of hours and minutes between two chosen times within the same day:
 First, identify the starting and an ending time. The goal is to subtract the starting time from the ending time under the correct conditions.
 If the times are not already in 24hour time, convert them to 24hour time. AM hours are the same in both 12hour and 24hour time. For PM hours, add 12 to the number to convert it to 24hour time. For example, 1:00 PM would be 13:00 in 24hour time.
 Determine whether the number of minutes is larger in the starting time or the ending time.
 If the ending time has a larger number of minutes: Subtract the starting time from the ending time as you would subtract normally, keeping the hours and minutes on the appropriate side of the “:”, where hours are on the left, and minutes are on the right. For example:
13:57  
–  9:22 
4:35 

 If the starting time has a larger number of minutes: Treat the hour and minute portion separately. Add 60 to the number of minutes in the ending time, and subtract 1 hour from the hour portion of the ending time. Then, subtract the minutes and the hours, keeping the result on the appropriate side of the “:” where hours are on the left, and minutes are on the right. For example:

⇒ 

18 Hours From Now
To calculate 18 hours from now follow the below steps
 First convert the current time to 24hour format which is in hh:mm form.
 Now add 18 in hours position and 00 in mins position to the time.
 If the number in hours position is equal to/greater than 24 then subtract 24 from hours position. It will give you the exact time 18 hours from now.
 If the hour position is less than 24 than that is the final output.
For Example if the current time is 10:00.
18 hours from now will be 10:00+18:00 i.e. 28:00.
Since 28>24, 2824=4.
Therefore after 18 hours from present time will be 04:00.
Conclusion
It is very easy to calculate 18 hours from now by following simple step by step process.
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