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Unix Timestamp Converter
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FAQ
What is the difference between Unix timestamps in seconds and milliseconds?
A Unix timestamp represents a specific point in time as the number of seconds that have elapsed since January 1, 1970, 00:00:00 UTC. Timestamps in seconds are usually 10 digits long (e.g., 1697011200), while timestamps in milliseconds are 13 digits long (e.g., 1697011200000). The difference lies in precision — a second-based timestamp is accurate to 1 second, whereas a millisecond-based timestamp is accurate to 1/1000 of a second. Millisecond precision is commonly used in frontend applications or scenarios requiring higher time accuracy.
Is a Unix timestamp affected by time zones?
A Unix timestamp is not affected by time zones; it represents the number of seconds or milliseconds elapsed since January 1, 1970, 00:00:00 UTC. Time zones only affect the displayed time after conversion, not the timestamp itself.
What are the range limitations of Unix timestamps?
The range of Unix timestamps is mainly limited by numerical storage. A second-based timestamp represented by a 32-bit integer spans roughly from January 1, 1970, to January 19, 2038 (the well-known "Year 2038 problem"). Using a 64-bit integer or a millisecond-based timestamp greatly extends the range, covering very distant past and future dates.
Why was January 1, 1970 chosen as the starting point?
Early computer systems used 32-bit integers to represent time, which could only cover about 68 years. By choosing January 1, 1970, as the starting point, timestamps can extend up to 2038. This date is neutral, not tied to any specific historical event or calendar, making it an ideal unified reference.