The Unix time stamp tracks time as a running count of seconds. The count begins at the "Unix Epoch" on January 1st, 1970, so a Unix time stamp is simply the total seconds between any given date and the Unix Epoch. Since a day contains 86400 seconds (24 hours x 60 minutes x 60 seconds), conversion to Excel time can be done by dividing days by 86400 and adding the date value for January 1st, 1970.
In the example shown, the formula first divides the time stamp value in B5 by 86400, then adds the date value for the Unix Epoch, January 1, 1970. The formula evaluates like this:
When C5 is formatted with the Excel date "d-mmm-yyyy", the date is displayed as 1-Oct-2018.
How Excel tracks dates time
The Excel date system starts on January 1, 1900 and counts forward. The table below shows the numeric values associated with a few random dates:
1-Oct-2018 12:00 PM
Notice the last date includes a time as well. Since one day equals 1, and one day equals 24 hours, time in Excel can represented as fractional values of 1, as shown in the table below. In order to see the value displayed as a time, a time format needs to be applied.
The Unix time stamp tracks time as a running count of seconds. The count begins at the "Unix Epoch" on January 1st, 1970, so a Unix time stamp is simply the total seconds between any given date and the Unix Epoch. Since a day contains 86400 seconds...
Excel dates are serial numbers , and a day is equivalent to the number 1. This means 1 hour = 1/24 = 0.041666667. In other words, Excel times are just fractional number s: Time Fraction Hours 3:00 AM 0.125 3 6:00 AM 0.25 6 9:00 AM 0.375 9 12:00 PM 0...
Note: it's important to understand that Excel deals with time natively as fractions of a day. So, 12:00 PM is .5, 6:00 AM is .25, 6 PM is .75, and so on. This works fine for standard time and date calculations, but in many cases you'll want to...
Times in Excel are fractional values of the number 1 . So, 12 PM is 12/24 = .5, 6:00 AM is 6/24 = .25, and so on. So, to convert a time by a given number, you need to divide the number of hours by 24 to get required decimal value: E5 / 24 // convert...
Most of the work in this formula is done by the TEXT function, which applies a custom number format for hours and minutes to a value created by subtracting the start date from the end date. TEXT ( C5 - B5 , "h" " hrs " "m...
The complexity of calculating the number of hours between two times stems from times that cross midnight. This is because times that cross midnight often have a start time that is later than the end time (i.e. start at 9:00 PM, end at 6:00 AM). This...
In the Excel time system, one 24-hour day is equal to 1. This means times and hours are fractional values of 1, as shown in the table below: Hours Time Fraction Value 1 1:00 AM 1/24 0.04167 3 3:00 AM 3/24 0.125 6 6:00 AM 6/24 0.25 4 4:00 AM 4/24 0...
The Excel DATE function creates a valid date from individual year, month, and day components. The DATE function is useful for assembling dates that need to change dynamically based on other values in a worksheet.
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