Online timestamp and time format converter supporting Unix seconds and milliseconds, date and time conversion, common time formats, and ISO 8601. Useful for development, API debugging, databases, and log analysis.
Online timestamp and time format converter supporting Unix seconds and milliseconds, date and time conversion, common time formats, and ISO 8601. Useful for development, API debugging, databases, and log analysis.
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The Timestamp and Time Format Converter is an online Unix timestamp conversion tool that supports converting Unix timestamps in seconds or milliseconds to dates and times, and converting dates and times back to Unix timestamps. Enter a timestamp or date and time, select seconds, milliseconds, or automatic detection, and choose a time zone to quickly view the corresponding date and time.
The tool is useful for software development, API debugging, database processing, server log analysis, and checking the date and time represented by Unix timestamps.
A Unix timestamp is a numeric representation of a point in time, usually representing the amount of time elapsed since the Unix Epoch. The Unix Epoch is generally defined as January 1, 1970, 00:00:00 UTC.
Common Unix timestamps use seconds or milliseconds as the time unit. Second-based timestamps commonly contain around 10 digits, while millisecond timestamps commonly contain around 13 digits. The actual length may vary depending on the time range and implementation.
A second-based timestamp uses seconds as its unit, while a millisecond timestamp uses milliseconds. Both represent time from the same Unix Epoch, but they provide different levels of precision.
For example, JavaScript commonly uses Date.now() to return a millisecond timestamp, while many backend applications, Linux commands, and APIs commonly use Unix timestamps in seconds. Selecting the wrong unit can produce a completely incorrect date.
Automatic detection simplifies common timestamp conversion tasks. The tool analyzes the numeric input and determines whether it is more likely to represent seconds or milliseconds before performing the conversion.
If the timestamp unit is already known, selecting seconds or milliseconds directly is recommended to avoid ambiguity caused by unusual data ranges.
Converting a Unix timestamp to a date requires knowing both the timestamp unit and the display time zone. Enter a timestamp in seconds or milliseconds, select the appropriate unit, and the tool converts it into a readable date and time.
The same Unix timestamp may display different local dates and times in different time zones, but it still represents the same point in time. For example, UTC, Beijing time, and New York time can show different clock times for the same timestamp.
When converting a date and time to a Unix timestamp, the date, time, and time zone must be specified. The tool calculates the corresponding Unix timestamp according to the selected time zone.
Unix timestamps can provide a consistent numeric representation when time data is exchanged between applications, APIs, and databases, reducing problems caused by different date formats.
Unix timestamps normally represent a point in time with a number, while ISO 8601 is a standardized date and time representation. For example, an ISO 8601 value can represent UTC time in a form such as 2026-08-28T09:52:17Z.
Timestamps are useful for program calculations, database storage, and API transmission, while ISO 8601 and similar formats are easier for people to read and are useful for logs and cross-system data exchange.
A Unix timestamp represents a specific point in time and is not directly tied to a particular local time zone. A time zone must be selected when displaying that timestamp as a local date and time.
For example, the same timestamp can be displayed using Asia/Shanghai, Asia/Tokyo, Europe/London, or America/New_York. When working with international time calculations or API debugging, always verify both the timestamp unit and time zone.
Select seconds as the timestamp unit, enter the Unix timestamp, choose the target time zone, and view the corresponding date and time.
Select milliseconds as the unit and enter the Unix timestamp. The tool parses the value as milliseconds and displays the corresponding date and time.
Enter a date and time, specify the time zone, and the tool calculates the corresponding Unix timestamp for use in API parameters, databases, and application debugging.
First confirm whether the input uses seconds or milliseconds. Then verify the time zone used for display or conversion. An incorrect unit or time zone can cause the resulting date and time to differ from the expected value.
For timestamps from an unknown source, automatic detection can help identify the likely unit. For software development and data processing, explicitly selecting the timestamp unit and time zone is recommended.
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