The Unix/Epoch Timestamp is nothing but a representation of time in seconds or milliseconds. The time elapsed from January 1st, 1970 at UTC( or GMT) to any particular time in seconds (or milliseconds) is called the timestamp of that instance. The timestamp always represents the time at the UTC only. Few systems display the time as a 32-bit integer which may cause an issue on January 19, 2038(Also known as Y2038). The efficient tool on this page will help you to convert timestamps in seconds (10-digit), milliseconds (13-digit) and microseconds (16-digit) to human-readable DateTime.
ISO 8601 is a date and time notation format defined by ISO as an international standard. The date and time are connected by "T" and written. The time zone is expressed as "+09:00" as the difference time from UTC, and in the case of UTC, it is expressed as "Z". Separate seconds and milliseconds with a comma (,) or dot (.). DenCode omits milliseconds when milliseconds are 000. ISO 8601 comes in several formats.
The tool in this page will allow you do all the basic and advanced time conversions like unix time to iso date-time string, human readable date time string in UTC timezone and you current timezone. The online unix time conversion tool has feature to convert human readable time with timezone to milli-second and seconds timestamps.
The Unix timestamp conversion with all the timezones will be available here in timezone converter tool
Unix/Epoch timestamp gives a unique representation of the date-time around worldwide. It always represents the date-time at GMT (Greenwich Mean Time Zone) or UTC. The different location times will be obtained from the time difference to the GTM.
The other alternative for timestamps to use in programming is ISO-String, but even the ISO-string are generic for all the timezones. The conversion of the date string to a different timezone is not as simple as converting the timestamp.
For Example, If the timestamp value is 1577923200 then,
Date-time difference calculator