Parse Dates in Excel Files Online

What date formats does the Excel date parser support?

Auto-detection handles ISO 8601 and standard text dates. You can also parse Unix epoch (seconds or milliseconds), US dates (MM/DD/YYYY), EU dates (DD/MM/YYYY), or any custom pattern using strptime syntax.

Can I convert between timezones in a Excel file?

Yes. Select the source timezone your dates are stored in and the target timezone you want to convert to. The tool uses AT TIME ZONE for accurate conversion.

What happens if a date cannot be parsed in a Excel file?

TRY_CAST is used for safe parsing — unparseable values become null rather than causing an error. Check the result preview for any nulls before downloading.

Is my data private?

Yes — completely. Your file is never uploaded to any server. Everything runs locally in your browser using WebAssembly — processing happens entirely inside your tab. Once you close the tab, nothing is retained.

What is the maximum file size?

The free limit is 50 MB. For larger files, performance depends on your device's available memory — most modern machines handle 500 MB to 1 GB comfortably.