NSDate().timeIntervalSince1970

import (
  "time"
)
int64(time.Now().Unix())

// pure java
System.currentTimeMillis() / 1000

// joda java
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.

<?php
// pure php
time();

<?php
// carbon php
use Carbon\Carbon;
Carbon::now()->timestamp;

import time
time.time()

import arrow
arrow.utcnow().timestamp

Time.now.to_i

date +%s

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

os.time()

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

(new DateTime.now().millisecondsSinceEpoch / 1000).truncate()