Unix时间戳(Unix timestamp)转换

如何在不同编程语言中获取现在的Unix时间戳(Unix timestamp)？

Java time 
JavaScript Math.round(new Date().getTime()/1000)
getTime()返回数值的单位是毫秒  
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 先 import time 然后 time.time() 
Ruby 获取Unix时间戳：Time.now 或 Time.new
显示Unix时间戳：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()) 
其他操作系统
(如果Perl被安装在系统中)  命令行状态：perl -e "print time" 

如何在不同编程语言中实现Unix时间戳(Unix timestamp) → 普通时间？

Java String date = new java.text.SimpleDateFormat("dd/MM/yyyy HH:mm:ss").format(new java.util.Date(Unix timestamp * 1000)) 
JavaScript 先 var unixTimestamp = new Date(Unix timestamp * 1000) 然后	commonTime = unixTimestamp.toLocaleString() 
Linux date -d @Unix timestamp 
MySQL from_unixtime(Unix timestamp) 
Perl 先 my $time = Unix timestamp 然后	my ($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 先 import time 然后 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") 
其他操作系统(如果Perl被安装在系统中)  命令行状态：perl -e "print scalar(localtime(Unix timestamp))" 

如何在不同编程语言中实现普通时间 → Unix时间戳(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)
时间格式: YYYY-MM-DD HH:MM:SS 或 YYMMDD 或 YYYYMMDD  
Perl 先 use Time::Local 然后	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 先 import time 然后 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)