Timestamp Converter
Convert a local date and time to Unix seconds or milliseconds, or convert a timestamp to UTC and your local time.
- Unix timestamp (seconds)
- 1793805420
- Unix timestamp (milliseconds)
- 1793805420000
- UTC ISO 8601
- 2026-11-04T15:17:00.000Z
Timestamp calculations run locally. Seconds and milliseconds are explicit choices to avoid guessing from the number's length.
🔒 All processing happens in your browser — files never leave your device. Your input stays in this browser and is not uploaded to Smart Online Tools.
How it works
- Choose Date to timestamp or Timestamp to date.
- Enter a date and time or a timestamp, then select seconds or milliseconds.
- Copy the displayed value.
Good to know: The date-to-timestamp direction uses your device's local time zone and shows the corresponding UTC ISO date. Timestamp units are selected explicitly.
Privacy and processing
Your input stays in this browser and is not uploaded to Smart Online Tools.
Frequently asked questions
Does a Unix timestamp include a time zone?
It represents a UTC instant. Time zones affect how that instant is displayed as a local clock time.
Why does my timestamp show a different hour?
The converter may be showing local time while the source was recorded in UTC or another time zone.
What does Timestamp Converter do?
Convert dates and times to Unix timestamps and back. Convert a local date and time to Unix seconds or milliseconds, or convert a timestamp to UTC and your local time.
Does this tool upload my files or input?
Your input stays in this browser and is not uploaded to Smart Online Tools.
What should I know before using this tool?
The date-to-timestamp direction uses your device's local time zone and shows the corresponding UTC ISO date. Timestamp units are selected explicitly.