[shell] timestamp to date 타임스탬프값을 날짜로 변환 shell> date Fri Mar 13 19:12:32 KST 2015 shell> date '+%s' 1426241552 shell> date -d @1426241552 '+%Y-%m-%d %H:%M:%S %Z' 2015-03-13 19:07:32 KST