Unix Timestamp Converter
Read the current Unix time, turn a timestamp in seconds or milliseconds into a readable date, or build a timestamp from a picked date and time. Every conversion runs in your browser, so nothing you type leaves your device.
About Unix timestamps
A Unix timestamp is the number of seconds elapsed since midnight UTC on January 1, 1970, excluding leap seconds.
Daylight saving time in China
China observed nationwide daylight saving time from 1986 through 1991. Clocks were generally advanced by one hour from the first Sunday in mid-April until the first Sunday in mid-September. In 1986, the initial period ran from May 4 to September 14. China has not observed daylight saving time since April 5, 1992.
JDK daylight-saving differences
Some JDK versions disagree about historical daylight-saving transitions in the Asia/Shanghai time zone. Earlier data placed the transition at midnight; later evidence showed that it occurred at 2:00 a.m., and newer JDK releases corrected the rule.
A short timestamp story
In August 1969, Bell Labs programmer Ken Thompson began building a new operating system on an aging PDP-7 using the B programming language. Thompson and Dennis Ritchie later evolved B into C and rewrote UNIX, with the new version released in 1971.
The largest signed 32-bit integer is 2,147,483,647. At 03:14:07 UTC on January 19, 2038, a signed 32-bit Unix timestamp reaches that limit. Systems that still store time this way may overflow to December 13, 1901, potentially causing software failures—the issue commonly known as the Year 2038 problem.
Timestamp Converter FAQ
Is the 73hi timestamp converter free to use?
Yes. The converter is completely free, with no sign-up and no usage limit.
Does the timestamp converter upload my data?
No. All conversion runs locally in your browser in JavaScript. Nothing you type is sent to our servers.
What is the difference between seconds and milliseconds?
Unix timestamps can be counted in seconds or milliseconds. Use the unit selector to switch; one second equals 1000 milliseconds, and the tool converts both ways.
Does the tool handle time zones and daylight saving?
Conversion uses UTC internally and shows the local time of your browser, so daylight-saving transitions are handled automatically.
What is the Year 2038 problem?
A signed 32-bit timestamp overflows at 03:14:07 UTC on 19 January 2038, which can break older systems. The converter uses full-precision values and is not affected.