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CSV ISO Date Column Checker

Validate YYYY-MM-DD values in a selected CSV column.

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Validate YYYY-MM-DD values in a selected CSV column online

Validate YYYY-MM-DD values in a selected CSV column. Use this when inspecting structured input or preparing a data or code artifact. Generated commands and configurations remain text until you review and use them yourself.

How to use it

Paste the multi-line input in the format shown below. Set date column. Choose Run tool. Review the output, then copy or download it.

Options and example settings

Option	Choices / value	Example default
Date column	Enter date column.	date

Worked examples

Use this when inspecting structured input or preparing a data or code artifact. Generated commands and configurations remain text until you review and use them yourself.

Reproducible worked example

Settings: Date column: date

Input:

name,date
Anna,2026-10-19
Ben,2026-02-30

With the input and settings above, the tool produces:

Output:

[
  {
    "dataRow": 1,
    "value": "2026-10-19",
    "valid": true
  },
  {
    "dataRow": 2,
    "value": "2026-02-30",
    "valid": false
  }
]

The example returns 2 top-level items in an array. Each item is a record; the first record contains “dataRow”, “value”, “valid”.

Limitations and common mistakes

Results reflect your supplied input and selected settings. Check the worked example and output before reuse.
Combined input is bounded to 150,000 characters; output text is bounded to 1.2 million characters. Some algorithms impose smaller limits, stated in their error messages.

Frequently asked questions

What format should I enter?

Paste the multi-line input in the format shown below. The worked example shows the supported structure and actual output.

How can I check YYYY-MM-DD values in a selected CSV column online?

Paste the multi-line input in the format shown below. Set date column. Choose Run tool. Review the output, then copy or download it.

Where is my input processed?

The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.