Papiral
PixelForge
Tabular
TabularStandardize Date Formats in CSV
Convert inconsistent date formats in any column to a single consistent format — ISO, US, EU, or custom.
What this tool does
Mixed date formats break imports, cause sort failures, and corrupt analyses. Tabular's date formatter auto-detects common date patterns (MM/DD/YYYY, DD/MM/YYYY, Month D YYYY, and more) and rewrites them to whichever format you need — YYYY-MM-DD for databases, MM/DD/YYYY for US systems, or any other standard. Cells that can't be parsed are left unchanged so you never lose data.
Problems it solves
- Mixed date formats from merged data sources
- European DD/MM/YYYY dates misread as US MM/DD/YYYY
- Dates failing database imports due to wrong format
- Inconsistent date columns breaking sort and filter operations
- Exported spreadsheets with spelled-out dates like 'January 1, 2024'
Example
Three different date formats auto-detected and normalized to ISO 8601.
Before
| Name | Signup Date |
| Alice | 1/15/2024 |
| Bob | March 3, 2024 |
| Carol | 2024/04/22 |
After
| Name | Signup Date |
| Alice | 2024-01-15 |
| Bob | 2024-03-03 |
| Carol | 2024-04-22 |
Frequently asked questions
What date formats can Tabular auto-detect?
Auto-detect handles the most common formats: YYYY-MM-DD, MM/DD/YYYY, DD/MM/YYYY, M/D/YYYY, M/D/YY, YYYY/MM/DD, MM-DD-YYYY, DD-MM-YYYY, and spelled-out formats like 'January 15, 2024' and 'Jan 15, 2024'.
What happens to cells that can't be parsed?
Unparseable cells are left exactly as-is. Tabular never overwrites data it can't confidently convert, so you won't lose information.
Can I convert a whole file with mixed formats in one column?
Yes. Use auto-detect as the input format — Tabular tries each supported format independently for each cell, so a single column can contain multiple formats and still be normalized correctly.
Is this a Pro feature?
Yes. Date format standardization is available on Pro and Business plans.
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