654321时区e,O,P和T时区标识符,或与UTC之间的差异(以小时为单位),或与UTC之间的差异(小时和分钟之间的冒号)或时区缩写例如:UTC,GMT,大西洋/亚速尔群岛或+0200或+02:00或EST,MDT
该格林威治时间(GMT)与小时之差例如:+0200P格林威治时间(格林尼治标准时间)与小时和分钟之间冒号的区别(在PHP5.1.3中添加)例如:+02:00Ť时区缩写例如:EST,MDT...同以秒为单位的时区偏移量
Eastern","EST","EDT")Central=USTimeZone(-6,"Central","CST","CDT")Mountain=USTimeZone(-7,"Mountain","MST","MDT
\s+([+-]\d{4}|UT|GMT|EST|EDT|CST|CDT|MST|MDT|PST|PDT|[A-IK-Z])/ix=~date#SinceRFC2822permitcomments,theregexphasnorightanchor.day