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Unix Timestamp TimeStamp Conversion Tool-What is Timestamp?

1,Unix timestamp, or Unix time, POSIX time,
Is a time representation, defined as the total number of seconds from January 01, 1970, 00: 00: 00 00 GMT to the present.
Unix timestamps are used not only in Unix systems, Unix-like systems, but also in many other operating systems.
Most Unix systems store timestamps as a 32-bit integer, which may cause some issues on January 19, 2038 (Y2038 issue


How to get the current Unix timestamp in different programming languages？

Java time
JavaScript Math.round(new Date().getTime()/1000)
getTime()The value is returned in milliseconds
Microsoft .NET / C# epoch = (DateTime.Now.ToUniversalTime().Ticks - 621355968000000000) / 10000000
MySQL SELECT unix_timestamp(now())
Perl time
PHP time()
PostgreSQL SELECT extract(epoch FROM now())
Python First import time then time.time ()
Ruby Get Unix timestamp:Time.now or Time.new
Show Unix timestamp:Time.now.to_i
SQL Server SELECT DATEDIFF(s, '1970-01-01 00:00:00', GETUTCDATE())
Unix / Linux date +%s
VBScript / ASP DateDiff("s", "01/01/1970 00:00:00", Now())
Other operating systems
(If Perl is installed on the system) 		Command line status:perl -e "print time"

How to implement Unix timestamp → ordinary time in different programming languages?

Java String date = new java.text.SimpleDateFormat("dd/MM/yyyy HH:mm:ss").format(new java.util.Date(Unix timestamp * 1000))
JavaScript First var unixTimestamp = new Date ( Unix timestamp * 1000) commonTime = unixTimestamp.toLocaleString()
Linux date -d @Unix timestamp
MySQL from_unixtime(Unix timestamp)
Perl first my $ time = Unix timestamp then my ($sec, $min, $hour, $day, $month, $year) = (localtime($time))[0,1,2,3,4,5,6]
PHP date('r', Unix timestamp)
PostgreSQL SELECT TIMESTAMP WITH TIME ZONE 'epoch' + Unix timestamp) * INTERVAL '1 second';
Python first import time then time.gmtime(Unix timestamp)
Ruby Time.at(Unix timestamp)
SQL Server DATEADD(s, Unix timestamp, '1970-01-01 00:00:00')
VBScript / ASP DateAdd("s", Unix timestamp, "01/01/1970 00:00:00")
Other operating systems
(If Perl is installed on the system) 		Command line status:perl -e "print scalar(localtime(Unix timestamp))"

How to implement ordinary time in different programming languages → Unix timestamp？

Java long epoch = new java.text.SimpleDateFormat("dd/MM/yyyy HH:mm:ss").parse("01/01/1970 01:00:00");
JavaScript var commonTime = new Date(Date.UTC(year, month - 1, day, hour, minute, second))
MySQL SELECT unix_timestamp(time)
Time format: YYYY-MM-DD HH: MM: SS or YYMMDD or YYYYMMDD
Perl first use Time :: Local then my $time = timelocal($sec, $min, $hour, $day, $month, $year);
PHP mktime(hour, minute, second, month, day, year)
PostgreSQL SELECT extract(epoch FROM date('YYYY-MM-DD HH:MM:SS'));
Python first import time then int(time.mktime(time.strptime('YYYY-MM-DD HH:MM:SS', '%Y-%m-%d %H:%M:%S')))
Ruby Time.local(year, month, day, hour, minute, second)
SQL Server SELECT DATEDIFF(s, '1970-01-01 00:00:00', time)
Unix / Linux date +%s -d"Jan 1, 1970 00:00:01"
VBScript / ASP DateDiff("s", "01/01/1970 00:00:00", time)