Current unixtime / unix timestamp:
1611808133
seconds since Jan 01 1970 (UTC).
Bulk unix timestamp converter
What is Unix time?
Unix time, also sometimes known as POSIX or epoch time, is a universal system for keeping track of time that is useful in computer technology. Why? Because unix time is simply a count of seconds that have elapsed since January 1 1970, 00:00:00 UTC (the Unix epoch), and that makes for some terribly easy time-related computing and programming (think sorting, math, etc). The unix time(stamp) can always be converted into any normal date format needed.
Unixtime trivia
The year 2038 problemOn January 19 2038, Unix time 2147483647, systems still storing Unix time as a signed 32-bit integer will start to malfunction due to an overflow. 2147483647 is simply as high as a signed 32-bit integer can go! The bugs that will result are specific to the way the respective OS or program is using Unix time; they can be lethal shutdowns or harmless GUI errors. This problem is similar to the Y2K incident, and it is therefore variously named the Unix Millennium bug, Y2K38, or simply the year 2038 problem. More info at wikipedia.org/wiki/Year_2038_problem.
1000000000th secondUnix time 1000000000 fell on 9th September 2001, 01:46:40 AM (UTC) and was celebrated in by a party held by Danish UNIX User Group in Copenhagen.
1234567890 dayUnix time 1234567890 ticked on 13th February of 2009, 11:31:30 PM (UTC). Thanks in part to the success of previous unix time parties, and the efforts of 1234567890day.com (defunct), '1234567890 parties' were held in many major cities around the world.