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How to convert a serial number to a date in Excel and Google Sheets
Excel & Google Sheets
=TEXT(A2,"YYYY-MM-DD")✓
Verified example
Computed by a real spreadsheet engine on the sample data below.
| Serial Number | Date |
| 45297 | |
| 45383 | |
| 44927 | |
| 45658 |
=TEXT(A2,"YYYY-MM-DD")→2024-01-06
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Step by step
- 1If the serial number is already in a cell (e.g., A2 contains 45297), select the cell and change its format to Date — no formula needed.
- 2To convert and display as text, use =TEXT(A2,"YYYY-MM-DD") in B2.
- 3To keep it as a date value for further calculations, format A2 as Date (Ctrl+1 > Date in Excel or Format > Number > Date in Sheets).
- 4Note: Excel's date system starts at 1 = January 1, 1900; Sheets also defaults to 1900 (but can use 1904 system).
Tips
- If you're pasting serial numbers that look like 5-digit integers, just format the cell as Date — no formula required — and the number will render as a date.
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Frequently asked
Why does my date show 1904 when I expect a 2024 date?
The 1904 date system may be enabled. In Excel: File > Options > Advanced > uncheck 'Use 1904 date system'. In Sheets it defaults to 1900.
What does serial number 1 equal?
In Excel's 1900 system, serial 1 = January 1, 1900. Serial 45297 = January 1, 2024.