台灣是 +0800，因此如下

Wed, 31 Dec 2014 10:11:50 -0500 (EST)

-> Wed, 31 Dec. 2014 18:11:50 +0000
-> Wed, 31 Dec. 2014 26:11:50 +0800
-> Thr, 1 Jan. 2015 02:11:50

Fri, 9 Jan 2015 19:42:07 -0500 (EST)

-> Fri, 9 Jan 2015 24:42:07 +0000
-> Fri, 9 Jan 2015 32:42:07 +0800
-> Sat, 10 Jan 2015 12:42:07 +0800

Sun, 11 Jan 2015 10:44:29 +0100

-> Sun, 11 Jan 2015 17:44:29 +0800