NSDate().timeIntervalSince1970

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

// pure java
    (int) (System.currentTimeMillis() / 1000)

// joda
    (int) (DateTime.now().getMillis() / 1000)

Math.round(new Date() / 1000)

[[NSDate date] timeIntervalSince1970]

SELECT unix_timestamp(now())

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

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

// pure php
    time()

// Carbon\Carbon
    Carbon::now()->timestamp

import time
    time.time()

Time.now.to_i

date +%s

(new Date().time / 1000).intValue()

os.time()

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