How do I get the current UNIX timestamp (Unix timestamp) in different programming languages?

The Unix time stamp (Unix timestamp), or Unix time, or POSIX time, is a time representation defined as the total number of seconds from GMT January 01, 1970 00:00 00 seconds to now. Unix timestamps are used not only in UNIX systems, Unix-like systems, but also in many other operating systems.

A significant portion of the operating system is currently using 32-bit binary numbers to represent time. UNIX timestamps of such systems can be used up to Greenwich Mean time of January 19, 2038 03:14 07 seconds (binary:01111111 11111111 11111111 11111111). After a second, the binary number will change to 10000000 00000000 00000000 00000000, an overflow error, causing the system to misunderstand the time of December 13, 1901 20:45 52 seconds. This is likely to cause a software failure, or even a system crash. Systems that use 64-bit binary numbers to represent time (up to GMT 292,277,026,596, December 04, 15:30, 08 seconds) do not experience this kind of overflow.

How to get the current UNIX timestamp in different programming languages ( Unix Timestamp)？

Java	Time
Javascript	Math.Round (New Date (). GetTime ()/1000) GetTime () The unit of return value is 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 and 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 in the system)	Command line status: PERL-E "Print Time"

How to implement UNIX timestamps in different programming languages ( Unix Timestamp) → Normal time?

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 *) and then 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 and 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 in the system)	Command line status: Perl-e "Print scalar (localtime (Unix timestamp))"

How do I get the current UNIX timestamp (Unix timestamp) in different programming languages?