有两种
I picked up a pen at 17:30 on Tuesday, the 12th May, 2012
the 12th May 是同位语
时间按从小到大即“时/日/月/年”
也可以是I picked up a pen at 17:30 on Tuesday,May 12th, 2012
顺序为“时/月/日/年”
I picked up a pen on Tuesday, May 12, 2012 17:30
i picked up a pen at 5:30 pm on Tuesday on May 12, 2012.