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Unix Timestamp Converter for CSV Columns

Convert CSV dates to Unix timestamps or timestamps back to ISO dates in your browser. Handles whole columns with invalid-value reporting.

Quick start

Built for convert unix timestamps to readable dates or vice versa.

Everything runs in your browser, so you can test the workflow with sample data when available before using production files.

Output: A new file or report produced locally in your browser.

  1. 1Choose a supported file or use sample data when available.
  2. 2Set the options shown for this workflow.
  3. 3Process the file locally, inspect the result, and download a new copy.
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How to Unix Timestamp Converter

  1. 1Upload a CSV containing the date or timestamp column.
  2. 2Choose the column and direction (to Unix or from Unix).
  3. 3Run the conversion to add a converted column.
  4. 4Download the enriched CSV with originals intact.

Why Use This Tool?

  • ✓Both Directions - Dates to epoch seconds and back
  • ✓Originals Kept - Converted values land in a new column
  • ✓Invalid Safe - Unparseable values stay blank, not wrong
  • ✓UTC Consistent - ISO output uses unambiguous UTC

Frequently Asked Questions

Seconds or milliseconds?

The converter expects epoch seconds, the most common database format. Divide millisecond columns by 1000 first, or use Find and Replace.

What timezone is used?

Parsing follows ISO 8601 rules; strings without timezone info are treated as local time per JavaScript semantics, so prefer ISO inputs.

Why is my converted column empty?

The source value was not parseable as a date or integer. Blank beats incorrect — fix the source with Standardize Dates first.