(int) System.currentTimeMillis()

Math.round(new Date())

time()

import time
    time.time()

(DateTime.Now.ToUniversalTime().Ticks - 621355968000000000) / 10000000

NSDate().timeIntervalSince1970

[[NSDate date] timeIntervalSince1970]

import (
      "time"
    )
    int32(time.Now().Unix())

SELECT unix_timestamp(now())

SELECT strftime('%s', 'now')

calendar:datetime_to_gregorian_seconds(calendar:universal_time())-719528*24*3600.

Time.now.to_i

date +%s

(new Date().time).intValue()

os.time()