1.Swift NSDate().timeIntervalSince1970
2.Go int32(time.Now().Unix())
3.Java (int) (System.currentTimeMillis() / 1000)
4.JavaScript Math.round(new Date() / 1000)
5.Objective-C [[NSDate date] timeIntervalSince1970]
6.MySQL SELECT unix_timestamp(now())
7.SQLite SELECT strftime('%s', 'now')
8.Erlang calendar:datetime_to_gregorian_seconds(calendar:universal_time())-719528*24*3600.
9.PHP time()
10.Python time.time()
11.Ruby Time.now.to_i
12.Shell date +%s