Unix Time Converter
Convert between Unix epoch and dates.
Unix timestamps - seconds or milliseconds since January 1, 1970 UTC - appear everywhere in server logs, JWT claims, database columns, and API responses. Utilitoo's Unix Time Converter transforms epoch values into human-readable dates and converts date-time picks back into Unix seconds and milliseconds.
Backend developers debugging log entries, data engineers inspecting Parquet or BigQuery epoch columns, and security analysts reviewing token expiry fields all need fast bidirectional conversion. Utilitoo auto-detects seconds versus milliseconds based on digit count.
Paste a Unix timestamp to see ISO 8601, UTC, and local representations, or pick a date and time to get the corresponding epoch values. Click Use current time for the present moment. Pair with Timestamp Converter for the same workflow or JWT Decoder when inspecting token expiration claims.
All conversion runs locally in your browser on Utilitoo. Your log data and timestamps are never uploaded to any server. Free, instant, and privacy-first for developers and analysts working with epoch time daily.
Unix Time Converter bridges epoch integers and human-readable dates. It is essential when logs, databases, and chat messages disagree about what a number means.
Common use cases
- Translating epoch values from logs into local wall-clock times during incidents.
- Writing test fixtures that need exact Unix seconds or milliseconds.
- Explaining second vs millisecond epochs to teammates new to APIs.
- Converting 'now' into epoch for manual database queries.
- Checking JWT exp claims alongside JWT Decoder.
Tips & common mistakes
10-digit values are usually seconds; 13-digit values are usually milliseconds - mixing them is the top mistake. Pair with Timestamp Converter for richer timezone displays. Conversion is local in the browser. Keep a note of whether your datastore stores seconds or milliseconds so fixtures stay consistent. When logs mix both, convert samples from each field separately. Cross-check surprising dates with Timestamp Converter's timezone display.
Common errors
- Treating milliseconds as seconds shifts dates by decades.
- Assuming UTC when the display is local - confirm which zone you are reading.
How to use
- Enter timestamp or date.
- View conversion.
Frequently Asked Questions
How do I convert a Unix timestamp to a date?▼
Paste the epoch value into Utilitoo and click Convert. Seconds and milliseconds are auto-detected.
Seconds or milliseconds?▼
Both are supported. Values with 13 or more digits are treated as milliseconds; shorter values as seconds. Mixing units is the most common incident mistake - see the blog guide Reading Unix Timestamps in Incident Logs.
What timezone is shown?▼
Utilitoo displays both UTC and your browser's local timezone.
Can I convert the current time to Unix?▼
Yes. Click Use current time to get the present epoch in seconds and milliseconds.
Is my timestamp data uploaded?▼
No. All conversion happens locally in your browser on Utilitoo.
Related Tools
Timestamp Converter
Convert Unix timestamps to dates and back.
Timezone Converter
Convert times between timezones.
JWT Decoder
Decode JWT tokens and inspect claims.
Date Difference Calculator
Calculate days between two dates.
Cron Expression Parser
Parse cron expressions into human-readable schedules.
Current Time in City
See current local time in any city.