获取当前时间戳

获取当前时间戳

Swift	NSDate().timeIntervalSince1970
Go	import ( "time" ) int32(time.Now().Unix())
Java	// pure java (int) (System.currentTimeMillis() / 1000) // joda (int) (DateTime.now().getMillis() / 1000)
JavaScript	Math.round(new Date() / 1000)
Objective-C	[[NSDate date] timeIntervalSince1970]
MySQL	SELECT unix_timestamp(now())
SQLite	SELECT strftime('%s', 'now')
Erlang	calendar:datetime_to_gregorian_seconds(calendar:universal_time())-719528*24*3600.
PHP	// pure php time() // Carbon\Carbon Carbon::now()->timestamp
Python	import time time.time()
Ruby	Time.now.to_i
Shell	date +%s
Groovy	(new Date().time / 1000).intValue()
Lua	os.time()
.NET/C#	(DateTime.Now.ToUniversalTime().Ticks - 621355968000000000) / 10000000

//一元减法运算符负数转成正数
var a = -10;
var b = -a;
console.log(b);