select *from `date` where DATEDIFF(FROM_UNIXTIME(unix_timestamp),NOW())=0 查詢當前時間數據 unix_timestamp是時間戳 0是當天 -1是前一天

echo time();//秒時間戳 

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

Math.round(new Date() / 1000)

date +%s

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

import time
time.time()