In Excel: select the dates, press Ctrl+1, choose Date or Custom, and apply a format such as m/d/yyyy, dd-mmm-yyyy, or yyyy-mm-dd.
Select the date cells.
Press Ctrl+1 to open Format Cells.
Choose Date for built-in formats or Custom for a pattern like yyyy-mm-dd.
If nothing changes, convert the values from text to real dates first.
What this does
Date formatting changes how a stored date is displayed, not the underlying serial number. That distinction matters: a real Excel date can show as 6/1/2026, 01-Jun-2026 or 2026-06-01 without changing its value. Text that only looks like a date must be converted first before number formatting will work. The same idea underpins a lot of everyday Excel work, so the few minutes spent getting it right here pay back across every sheet you build afterwards. Treat it as a pattern, not a one-off, and it stops being something you look up and starts being something you reach for. Treat “change date format in excel” as a small repeatable workflow rather than a one-off click you hope to remember next time. Use a small test block before the live file, so any surprise in the affected cells shows up while it is still harmless. When this is a ribbon command, the selection matters more than the button: confirm the range, apply the command, then spot-check the output before saving. That turns a workflow that saves repeating the same clicks every week into a method you can reuse, explain, and defend when the workbook leaves your screen.
A worked example
A2 contains the real date June 1, 2026. Press Ctrl+1, choose Custom, and type yyyy-mm-dd: the cell displays 2026-06-01 while formulas still treat it as the same date. If A2 contains text like 01.06.2026 that Excel does not recognize, use Text to Columns or DATEVALUE first, then format it. Clean date formats make sorting, filtering, lookup formulas and reports trustworthy. They also stop ambiguous month/day values from being misread across regions. If there is any chance you will reuse this, drop it into a small template tab right now: a labelled input area on the left and the formula beside it, checked once against the tool above. Next time the same question comes up, the answer is a single paste away instead of a rebuild from memory.
In Google Sheets
Everything above works in Google Sheets too. Excel and Sheets share the formula syntax used here; only the surrounding menus are arranged differently. That portability is deliberate — learn it once and it follows you between the two tools and across Windows and Mac. The aim was to get you unstuck fast and leave you a little more capable than a copy-paste would. The answer is at the top, the tool proves it, and the detail above shows why it holds — so the next time a colleague asks, you can answer without reaching for search. The short version of “change date format in excel”: the answer is at the top of this page, the tool proves it on your own numbers, and the sections above explain why it holds so the next variation does not stump you. Excel rewards people who reference cells instead of typing values and who keep inputs separate from formulas, because that is what makes a result you can audit months later. Build it once, deliberately, with the live tool as a check, and you convert a one-off lookup into a reusable skill — which is the whole point of learning the why and not just the what.
Common mistakes
- Trying to format text values that are not real Excel dates.
- Using mm when you meant minutes in a time format, or m when you meant month in a date context.
- Changing display format and expecting the underlying date value to change.
- Mixing regional date orders such as 03/04/2026 without clarifying whether it means March 4 or April 3.
Frequently asked questions
What is the ISO date format in Excel?
Use the custom format yyyy-mm-dd, for example 2026-06-01.
Why will my date format not change?
The value is probably text. Convert it to a real date with Text to Columns, DATEVALUE or a locale-aware import step.
Does changing format change the date?
No. It changes the display. The stored serial date remains the same unless you transform the value itself.
Other ways people ask this
This is also commonly searched as “how do i change date format in excel”, “change date format in excel”, “how can i change date format in excel” and “how to change a date format in excel”. They describe the identical operation, so you are in the right place no matter how you phrased it.
Why do people search for this in so many different ways?
Because the same task has many names. “how do i change date format in excel”, “change date format in excel”, “how can i change date format in excel” all point at the one operation explained on this page, which is why they all lead here.