Timestamp Batch Converter
Convert multiple timestamps at once. Paste a list of Unix timestamps, ISO dates, or mixed formats and convert them all in bulk.
About This Tool
The Timestamp Batch Converter is designed for developers and DevOps engineers who need to convert many timestamps at once. Unlike a single-value timestamp converter, this tool lets you paste an entire list of timestamps in mixed formats and convert them all in one operation. It is ideal for analyzing log files, debugging event sequences, and comparing timestamps from different systems that use different formats.
The tool automatically detects the format of each line. It recognizes Unix timestamps in seconds (10 digits) and milliseconds (13 digits), ISO 8601 strings, RFC 2822 dates, and common date formats like "Feb 22, 2024", "2024/02/22", and "22-02-2024". Each line is parsed independently, so you can freely mix formats in a single input. Lines that cannot be parsed are flagged as invalid without breaking the rest of the batch.
You can choose from seven output formats: ISO 8601, Unix
seconds, Unix milliseconds, local date/time, UTC date/time,
relative time (e.g., "2 hours ago"), and a custom
format string. The timezone selector supports all major
timezones via the browser's Intl.DateTimeFormat
API, so you can convert timestamps to any timezone without
installing anything.
Results appear in a table with columns for the original input, detected format, converted output, and validity status. You can sort results by timestamp order, copy all converted values to the clipboard, or download them as a CSV file. A stats panel shows the total count, valid/invalid breakdown, and the date range (earliest to latest) of the successfully parsed timestamps. All processing runs client-side in your browser — no data is sent to any server.
How to Use
- Paste your timestamps into the input textarea, one per line. You can mix different formats freely.
- Click Sample to load example data if you want to try the tool first.
- Select an Output Format from the dropdown. Choose "Custom Format" to define your own format string using tokens like YYYY, MM, DD, HH, mm, ss, and SSS.
- Choose a Timezone to convert all timestamps to that timezone. "Local" uses your browser's timezone.
- Click Convert All (or press Ctrl+Enter) to process all lines.
- Review the results table. Use the Sort button to reorder by timestamp value. Invalid lines are highlighted in red.
- Click Copy All to copy converted values to your clipboard, or Download CSV to export the full results table.
FAQ
How is this different from the single Timestamp Converter?
The single Timestamp Converter handles one timestamp at a time with features like a live clock and date picker. The Batch Converter is built for bulk operations: paste dozens or hundreds of timestamps in mixed formats and convert them all at once. It includes a results table, sorting, CSV export, and stats -- features designed for log analysis workflows.
What timestamp formats are supported?
The tool auto-detects Unix timestamps in seconds (10 digits) and milliseconds (13 digits), ISO 8601 strings (e.g., 2024-02-22T12:00:00Z), RFC 2822 dates, slash-separated dates (YYYY/MM/DD), dash-separated dates (DD-MM-YYYY), and common English date strings like "Feb 22, 2024".
What happens with invalid lines?
Invalid lines are shown in the results table with a red error indicator. They do not break the conversion of other lines. The stats panel shows how many lines were valid vs. invalid, so you can quickly spot parsing issues.
How does the custom format work?
The custom format uses simple tokens: YYYY (4-digit year), MM (2-digit month), DD (2-digit day), HH (24-hour hour), mm (minutes), ss (seconds), SSS (milliseconds), X (Unix timestamp in seconds), and x (Unix timestamp in milliseconds). For example, "YYYY-MM-DD HH:mm:ss" produces "2024-02-22 12:00:00".
Can I convert timestamps to different timezones?
Yes. Use the Timezone dropdown to select any IANA timezone (e.g., America/New_York, Asia/Tokyo, Europe/London). The converted output will reflect the selected timezone. "Local" uses your browser's current timezone.
How many timestamps can I convert at once?
There is no hard limit. The tool processes timestamps entirely in your browser, so performance depends on your device. Typical use cases of hundreds or even a few thousand lines work smoothly. For very large datasets (10,000+ lines), you may experience a brief delay during conversion.
Is my data safe?
Yes. All processing happens locally in your browser using JavaScript's native Date and Intl APIs. No data is sent to any server, and nothing is stored. You can verify this by checking the network tab in your browser's developer tools.
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