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Most of the standard number formats are fairly selfexplanatory, but the Date and Time formats may require a bit of explanation.
To help you understand how they work, do the following:
Can you figure out why this happened?
Excel assigns a numeric value to each date you enter so that it can create formulas that use dates. For example, you could write a formula that determined what a certain date would be that was a certain number of days before or after the entered date. It starts with 1/1/1900 as its baseline, or 1. Every other date is stored as a number that represents the number of days between it and 1/1/1900. So, for example, 12/31/1900 would be 366. (It was a leap year.)
Now try converting your birthday to a general number format:
In reallife usage, you seldom need to change between dates and general numbers, so this exercise is just to help you understand what's going on behindthescenes.
What about times? To answer this question, do the following:
Figure 47: Select a time format. The bottom two
choices show the date as well.
The number 1.55 changes to 1/1/00 13.12. As this experiment indicates, the numbers to the right of the decimal point represent time. The 1 to the left of the decimal still represents 1/1/1900, and the 55 represents 55 percent of the time between midnight and midnight: 1:12 PM, or 13:12 on a 24hour clock.
This experiment is useful mainly so that you understand how Excel deals with dates and times as numbers; in reality, you'll nearly always be entering dates and times in their normal format, such as 12:30 PM or 13:30:05.
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