Fortunately, these questions are easy to answer once you understand how Excel time formulas work. You can reformat the result by right-clicking the cell, choosing “Format Cells,” and picking a different time format. If you want only the time and not the date, you can either format it as a time and pretend the date doesn’t exist, or you can use “=NOW()-TODAY()”, which subtracts the date portion and leaves only the time portion. Whenever you recalculate (or whenever Excel recalculates automatically because other cells have changed), the function pulls the time as of that moment. NOTE: Someone who opens the worksheet in six months will see her own current date and time in this field, not the date and time that you saved the workbook. When you need to save a permanent record of the current time, hold down the Control key and the Shift key while you type a semicolon (;).
Similarly, you can save the current date by holding down the Control key (but not the Shift key) and typing a semicolon.
Because it saves the value and not an updateable function, someone who opens the worksheet in six months will see the date and time that you stamped on the page, not her own current date and time.
When you need to convert a specific number of hours, minutes, and seconds to an Excel time, use the TIME() function with the parameters the numbers of hours, minutes, and seconds. When you need to add or subtract a fixed number of hours, minutes, or seconds to a time value, just add or subtract the way you would any decimals.
To understand time arithmetic more fully, you need to understand first how Excel stores times.
Because times are simply numbers between 0 and 1, you can do any arithmetic on times, just as you would with any other decimal numbers. This shows that Excel did, in fact, add the two time values, which resulted in a number greater than one, meaning more than a full day.

This situation arises when you’re calculating how far in advance you need to begin a task so that it will be completed by the target time. Unfortunately, Excel does not like negative times, so you’ll need to introduce an error-trapping formula.
The attached timesheet calculator uses simple time subtraction to determine the number of hours worked in each segment: time out – time in. Finally, the overtime formula determines whether the number of weekly hours is greater than 40. In the attached time zone converter enter a starting time and time zone in Columns A and B (in the gold cells).
Column C converts the local time to Greenwich Mean Time, also known as UTC (Coordinated Universal Time), by subtracting the differential from GMT.
How can I create an If function to subtract 15 minutes from the time if the value is => 15 minutes. Be sure to format your cells in A1 and C1 as CUSTOM (as below with dates and times) or it becomes possible to get the right answer and not be able to tell that it is.
Regardless of how you format the display, however, the underlying value remains constant until you recalculate.
Add them, subtract them, multiply them by two, divide them by four—just like any other decimal numbers. It arises also in certain time zone conversions that cross over into the prior day—such as calculating London time when it’s 5:00 AM in Tokyo. Whenever subtracting times could result in a negative time, wrap it in an IF() statement which adds 1 to the result. The format for hours worked is “[h]:mm,” which ignores seconds and does not display AM or PM.

Remember that the differential (in hours) must be converted to a decimal first by dividing by 24. Columns E, G, and I calculate the target times by starting with the GMT base and adding the differential from GMT. From this point, you can develop far more complicated formulas, such as determining the average time required to complete a task, the maximum time between phone calls, etc.
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Because this could result in a negative time if the local time is far east and is early in the morning, the formula uses an IF() statement, adding a 1 if the result would be negative. Note that you can define the time zone abbreviation in Column A using any format that you like. As long as you remember that times are just decimal numbers that represent portions of a day, you can work through any remaining calculations. The sample data included shows some with abbreviations (GMT, EST, PDT, etc.) and others using cities.
The formula in cell F is =SUM(E4*24) which brings back a decimal number that would be .25 for the time I have here. Whatever values you enter here will show up in the pick list for entering data in Columns B, D, F, and H of the converter.

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