mktse:开始 = if activity already started, then it is activity Actual Start Date/Time, otherwise it is activity Early Start Date/Time
P2>:p%Z 完成 = if activity is completed, then it is activity Actual Finish Date/Time, otherwise it is activity Early Finish Date/Time
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E~X 计划开 ..
(2017-08-07 21:30) )+?HI^-[S