How to Change Date in Excel?

How to Change Date in Excel: A Comprehensive Guide

Want to know how to change date in Excel? You can easily change date formats in Excel using a variety of methods, including formatting cells, using text functions, or employing Power Query, depending on your desired outcome and the nature of the existing data.

Introduction to Date Manipulation in Excel

Excel is a powerful tool for data analysis, and dates are often a crucial part of that data. However, dealing with dates in Excel can sometimes be tricky. Dates are stored as serial numbers, which makes calculations easy but can lead to display issues if the formatting is incorrect. Therefore, understanding how to change date in Excel effectively is essential for accurate data handling. This article will explore various methods for changing date formats, converting text to dates, and correcting common date-related problems.

Why Change Dates in Excel?

There are many reasons why you might need to change date in Excel:

• Display Purposes: You might want to display dates in a specific format that is more readable or aligns with company standards (e.g., MM/DD/YYYY vs. DD/MM/YYYY).
• Data Consistency: Ensuring all dates in a spreadsheet are in the same format is crucial for accurate sorting, filtering, and reporting.
• Data Conversion: Sometimes, dates are imported or entered as text strings and need to be converted to date values for calculations.
• Regional Settings: Different regions use different date formats, so you might need to adjust dates to match the locale.

Methods for Changing Date Formats in Excel

Excel provides several ways to change the display format of dates:

• Format Cells Dialog Box: This is the most common method.

  • Select the cell(s) containing the dates you want to change.
  • Right-click and choose “Format Cells…” (or press Ctrl+1).
  • In the “Format Cells” dialog box, go to the “Number” tab.
  • Select “Date” in the “Category” list.
  • Choose your desired date format from the “Type” list.
  • Click “OK.”

• Ribbon (Home Tab): You can also access date formatting options from the ribbon.

  Next question: Are Numbers the Same as Excel?
  • Select the cell(s) containing the dates.
  • Go to the “Home” tab.
  • In the “Number” group, click the dropdown menu (usually showing “General” or a current format).
  • Choose “Short Date,” “Long Date,” or “More Number Formats…” (which opens the Format Cells dialog box).

• Custom Date Formats: For more specific formatting needs, you can create custom date formats.

  • Follow the steps to open the “Format Cells” dialog box (Number tab, Date category).
  • Select “Custom” in the “Category” list.
  • Enter your desired format code in the “Type” box. Common codes include:
    • yyyy: Four-digit year
    • yy: Two-digit year
    • mm: Two-digit month (with leading zero)
    • mmm: Abbreviated month name (e.g., Jan, Feb)
    • mmmm: Full month name (e.g., January, February)
    • dd: Two-digit day of the month (with leading zero)
    • ddd: Abbreviated day of the week (e.g., Sun, Mon)
    • dddd: Full day of the week (e.g., Sunday, Monday)

Converting Text to Dates in Excel

Sometimes, dates are imported or entered as text. Excel won’t recognize them as dates, preventing you from performing calculations. Here’s how to change date in Excel when they are currently text values:

• Using the DATEVALUE Function: This function converts a text string representing a date into a serial number.

  • Syntax: =DATEVALUE(date_text)
  • Example: If cell A1 contains “2023-12-25”, enter =DATEVALUE(A1) in another cell. Format the cell containing the formula as a date.

• Using Text to Columns: This feature can split a single column of text into multiple columns based on a delimiter (e.g., comma, space) and also convert the data type.

  • Select the column containing the text dates.
  • Go to the “Data” tab and click “Text to Columns.”
  • Choose “Delimited” or “Fixed Width” (depending on your data).
  • Click “Next.”
  • Specify the delimiter (if applicable) or adjust the column breaks.
  • Click “Next.”
  • In the “Column data format” section, select “Date” and choose the appropriate date format (e.g., YMD, MDY, DMY).
  • Click “Finish.”

• Using Power Query (Get & Transform Data): Power Query offers robust data transformation capabilities.

  • Select the data range containing the text dates.
  • Go to the “Data” tab and click “From Table/Range.”
  • In the Power Query Editor, select the column with the text dates.
  • Go to the “Transform” tab and click “Data Type: Any.”
  • Choose “Date.” Power Query will attempt to convert the text to dates. You might need to adjust the locale or format if the conversion isn’t accurate initially.
  • Click “Close & Load” to load the transformed data back into Excel.

Common Mistakes and Troubleshooting

• Dates Displaying as Numbers: This means the cell is formatted as a “General” or “Number” instead of “Date.” Change the cell format to “Date.”
• Dates Displaying as Errors (#VALUE!): This usually indicates that Excel cannot interpret the text string as a date. Check the date format and try the DATEVALUE function or Text to Columns feature. Ensure the text string conforms to a recognizable date format (e.g., “YYYY-MM-DD”, “MM/DD/YYYY”).
• Inconsistent Date Formats: Use the Format Painter to copy formatting from one cell to others, or apply a consistent format to the entire column.
• Regional Settings Impact: Excel’s date interpretation depends on your regional settings. If you’re working with data from different regions, you might need to adjust the date format settings in Windows or macOS.

Table of Date Formatting Codes

Code	Description	Example
yyyy	Four-digit year	2023
yy	Two-digit year	23
mm	Two-digit month (with leading zero)	01-12
mmm	Abbreviated month name	Jan-Dec
mmmm	Full month name	January-December
dd	Two-digit day of the month (with leading zero)	01-31
ddd	Abbreviated day of the week	Sun-Sat
dddd	Full day of the week	Sunday-Saturday

FAQs about Changing Dates in Excel

Why are my dates displaying as numbers instead of dates?

Excel stores dates as serial numbers. If your dates are showing as numbers, the cell format is likely set to “General” or “Number.” To fix this, select the cells and change the format to “Date” using the Format Cells dialog box or the ribbon.

How can I convert a text string like “January 1, 2023” to a date?

Use the DATEVALUE function. For example, if the text string is in cell A1, enter =DATEVALUE(A1) in another cell. Then, format the cell containing the formula as a Date.

How do I change the date format to show the full month name?

Select the cells containing the dates, open the Format Cells dialog box (Ctrl+1), go to “Custom,” and enter mmmm dd, yyyy in the “Type” box. This will display dates like “January 01, 2023.”

How do I extract the year from a date?

Use the YEAR function. For example, if the date is in cell A1, enter =YEAR(A1) in another cell. This will extract the year from the date.

How do I extract the month from a date?

Use the MONTH function. For example, if the date is in cell A1, enter =MONTH(A1) in another cell. This will extract the month number (1-12) from the date.

How do I extract the day from a date?

Use the DAY function. For example, if the date is in cell A1, enter =DAY(A1) in another cell. This will extract the day of the month (1-31) from the date.

Why are my dates showing up incorrectly when I import a CSV file?

The date format in the CSV file might be different from Excel’s default format. Use the Text to Columns feature (Data tab) to specify the correct date format during the import process.

How do I add or subtract days from a date?

Simply add or subtract the number of days directly from the date. For example, to add 7 days to the date in cell A1, enter =A1+7 in another cell. Ensure the result cell is formatted as a Date.

How do I calculate the difference between two dates in days?

Subtract the earlier date from the later date. For example, if date1 is in cell A1 and date2 is in cell B1, enter =B1-A1 in another cell. Format the result cell as “General” or “Number” to display the difference in days.

Can I use conditional formatting to highlight dates that are in the past?

Yes. Select the date range, go to “Conditional Formatting” (Home tab), choose “New Rule,” select “Use a formula to determine which cells to format,” and enter a formula like =A1<TODAY(). Choose a formatting style to highlight the dates.

How can I easily copy the date format from one cell to another?

Use the Format Painter. Select the cell with the desired date format, click the Format Painter icon (Home tab), and then click or drag over the cells you want to format.

Is it possible to prevent users from entering invalid dates?

Yes, using Data Validation. Select the cells where dates will be entered, go to “Data Validation” (Data tab), choose “Date” in the “Allow” dropdown, and set the “Data” criteria (e.g., “between,” “greater than,” etc.). You can also set error messages to display when an invalid date is entered.