Time and Date

Past Time

Convert Time Span

Multiplicate and Divide Time

Fraction

Periods per Time Span

Add Multiple Time Data

Minutes to Time

Time Sections

Add / Subtract Days to a Date

Resolve Times

Ratio of two Time Values

Rule of Three with Time Values

Between two Times of Day

Time per Time

Regular Intervals

Percent of a Time Span

Time Percentage

Add and Subtract Percent

Percent Growth per Time

Compare

Mean Value

Correct

Time Zones

Summer Time

a.m., p.m. - 24h

Lesson Length

Months, Years

Million Seconds

Doubling

Decimal Time Values

Timestamp

Date Format

World Time

Military Time

Daytime One Unit

Until midnight

*Convert Time Units*

## Multiplicate and Divide Time

A small tool for calculating with time data. Insert a period of time, a factor and an operator, times or divided by. The output of the result has the common notation with transition between the units.

Examples: 4 times 11 hours, 45 minutes and 30 seconds makes one day, 23 hours and 2 minutes.

Someone who works for 20 days in one month, 7 hours and 45 minutes each day, has worked for 6 full days and 11 hours altogether.

One hundred times ten hours is of course one thousand hours, which is easy to calculate in your head, but the time given as 41 days and 16 hours is much easier to understand.

Multiplication and division are particularly tricky when doing mental calculations with time, as the corresponding values of the time units are not based on the decimal system that we are used to and where we are more likely to calculate something in our heads before we take out a calculator or open the appropriate program. The ancient Babylonians counted in the twelve-digit system, and the counting of time units up to 60 and 24, which goes back to this, makes calculations very difficult. There is a subdivision of minutes and seconds to the base of one hundred, the so-called industrial time. However, this is not particularly common; it is sometimes used to count working hours.

Seconds and minutes go up to 60, which is a so-called sexagesimal system. The hours of a day are 24, the underlying system is the quadravigesimal system. The underlying system to the base of 12 is the duodecimal system. You probably don't need to remember these names, as the time values and results are written in the decimal system and use outside of this area is very rare.

**Time and Date Calculators**

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