java date pattern format HH와 hh 차이 등등.
hh와 HH는 24시간 기준 표현 여부인듯.. 아래 표 참조.. Letter Date or Time Component Presentation Examples G Era designator Text AD y Year Year 1996 ; 96 M Month in year Month July ; Jul ; 07 w Week in year Number 27 W Week in month Number 2 D Day in year Number 189 d Day in month Number 10 F Day of week in month Number 2 E Day in week Text Tuesday ; Tue a Am/pm marker Text PM H Hour in day (0-23) Number 0 k Hour in day (1-24) Number 24 K Hour in am/pm (0-11) Number 0 h Hour in am/pm (1-12) Number 12 m Minute in hour Number 30 s Second in minute Number 55 S Millisecond Number 978 z Time zone General time zone Pacific Standard Time ; PST ; GMT-08:00 Z Time zone RFC 822 time zone -0800