CSV Timezone Converter

Convert complete timestamp columns between IANA time zones. Upload or paste CSV, choose the timestamp columns and zones, preview the results, and download a converted file.

Converting one timestamp? Use the Time Zone Converter.

CSV input

Upload a CSV file .csv only, parsed locally

Paste CSV First row contains headers

Conversion settings

Input timestamp format

Source time zone

Target time zone

Output timestamp format

Timestamp columns

Select one or more timestamp columns

Paste or upload CSV to detect timestamp columns automatically.

Converted CSV preview

Paste or upload a CSV to create a downloadable file. Your data stays on your device.

Converted rows will appear here after you paste or upload CSV.

Focused timestamp formats

Offset-aware input 2026-08-18T14:30:00Z 2026-08-18T10:30:00-04:00

Naive local input 2026-08-18 10:30:00 08/18/2026 10:30 AM 18/08/2026 10:30

Convert timestamp columns without changing the rest of your CSV

The CSV Timezone Converter changes values only in the columns you select. Names, IDs, amounts, notes, empty cells, headers, and unselected columns remain in place. Processing happens inside your browser; DataZier does not upload the CSV or its timestamp values.

Load the CSV

Upload a CSV file or paste its contents. Timestamp columns are suggested from the chosen input format.

Choose zones and columns

Confirm one or more timestamp columns, then select the source and target IANA time zones.

Review and download

Inspect the converted preview and review count before downloading the complete CSV.

CSV timezone conversion examples

Input	Source	Target	Example output
`2026-08-18T14:30:00Z`	Offset included	America/New_York	`2026-08-18T10:30:00-04:00`
`2026-01-18 09:00:00`	America/Los_Angeles	Europe/London	`2026-01-18T17:00:00+00:00`
`18/08/2026 10:30`	Europe/Paris	Asia/Kathmandu	`2026-08-18T14:15:00+05:45`

Daylight-saving safety: A local clock time can occur twice when clocks move back or not exist when clocks move forward. DataZier does not guess in either case. It preserves the original value and counts it as needing review.

Normalize exports to UTC

Convert local application or CRM timestamps to UTC before loading the data into a warehouse.

Prepare regional reports

Translate event times into the time zone used by a client, office, or reporting dashboard.

Fix migration timestamps

Convert timestamp columns while leaving identifiers and other import fields unchanged.

CSV timezone converter FAQ

Does DataZier upload my CSV?

No. CSV parsing and timezone conversion happen locally in your browser. Only paid-access checks use DataZier's access endpoints.

What is an IANA time zone?

It is a named zone such as America/New_York or Europe/London that carries historical and daylight-saving rules. The converter uses the time-zone data available in your browser.

What happens to invalid or ambiguous timestamps?

The original cell value is preserved and counted as needing review. The converter never silently chooses between two possible DST instants.

Can I convert multiple timestamp columns?

Yes. Select one or more columns and every non-empty cell in those columns is analyzed with the same input, source-zone, target-zone, and output settings.

Is the CSV Timezone Converter free?

Jobs containing up to 50 selected non-empty timestamp cells can be converted and downloaded free. Larger jobs receive a 50-result preview and require DataZier Pro for the complete CSV.