What is the Unix Time?
The UNIX time (date timestamp) is the method of tracking time as a total of seconds (count of seconds). This count starts on January 1st, 1970 at UTC, which is considered the Unix Epoch, in other words, the UNIX timestamp represents the number of seconds between a particular date and the Unix Epoch.
Other Date&Time Useful Demos
ADD TIME TO DATE (by PHP Coder) – calculate the date and time starting with a date, by adding hours, days, and months to a specified date. The result will be displayed as timestamp, YYYY-MM-DD H:i format, and in text format.