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目錄
Use a Simple Subtraction Formula
Use the DATEDIF Function (for more control)
Watch Out for Common Pitfalls
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如何計算Excel中兩個日期之間的天數(shù)

Jul 05, 2025 am 01:23 AM

要計算Excel中兩個日期之間的天數(shù),最簡單的方法是使用減法公式或DATEDIF函數(shù)。 1. 使用減法公式:輸入=B1 - A1,確保單元格格式為日期,結(jié)果將顯示為天數(shù);2. 使用DATEDIF函數(shù):輸入=DATEDIF(A1, B1, "d")以獲取完整天數(shù),也可替換為"m"或"y"來計算月數(shù)或年數(shù);3. 注意常見問題:若結(jié)束日期早於開始日期,減法會返回負(fù)數(shù)而DATEDIF會報錯,確保日期正確格式化,並檢查導(dǎo)入的日期是否為文本格式,必要時使用DATEVALUE轉(zhuǎn)換。

how to calculate the number of days between two dates in excel

To calculate the number of days between two dates in Excel, all you need to do is subtract one date from the other. Excel stores dates as serial numbers, so when you subtract them, it gives you the difference in days automatically.

how to calculate the number of days between two dates in excel

Use a Simple Subtraction Formula

The most straightforward way is to use a formula like =End_Date - Start_Date . For example, if your start date is in cell A1 and your end date is in cell B1, you'd enter this into another cell:

how to calculate the number of days between two dates in excel
 =B1 - A1

This will return the total number of days between those two dates. Just make sure both cells are formatted as dates — otherwise, Excel might not calculate correctly.

One thing to watch out for: if your result shows up looking like a date instead of a number, change the cell format to "General" or "Number." That tells Excel not to display it like a date.

how to calculate the number of days between two dates in excel

Use the DATEDIF Function (for more control)

If you want more flexibility — like calculating differences in years, months, or days specifically — the DATEDIF function comes in handy. The syntax looks like this:

 =DATEDIF(Start_Date, End_Date, Unit)

The "Unit" part determines what kind of result you get:

  • "d" returns the number of days
  • "m" returns the number of full months
  • "y" returns the number of full years

For example, if you have a start date in A1 and an end date in B1, and you want the number of full days, you'd write:

 =DATEDIF(A1, B1, "d")

Note that DATEDIF isn't officially documented by Microsoft anymore, but it still works in current versions of Excel. It's especially useful if you're building reports where you want clean breakdowns of time differences.

Watch Out for Common Pitfalls

Here are a few things people often trip over when doing date math in Excel:

  • If your end date is earlier than your start date, the subtraction method will give you a negative number. DATEDIF , on the other hand, will return an error if the end date is earlier.
  • Always double-check date formatting. Sometimes Excel misreads entries like “01/02/03” depending on your regional settings.
  • If you're importing dates from external data sources, they might be stored as text instead of actual dates. In that case, use the DATEVALUE() function to convert them first.

Also, remember that Excel treats 1900 as a leap year (even though it wasn't), so there's a known bug affecting date calculations going back before March 1, 1900. But unless you're dealing with historical data from that era, it probably won't affect you.

基本上就這些。

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