解决方法
精度和范围(所以一切都很重要; -p)
从MSDN：
The DateTime value type represents dates and times with values ranging from 12:00:00 midnight,January 1,0001 Anno Domini (Common Era) through 11:59:59 P.M.,December 31,9999 A.D. (C.E.)
Time values are measured in 100-nanosecond units called ticks,and a particular date is the number of ticks since 12:00 midnight,0001 A.D. (C.E.) in the GregorianCalendar calenda
Date Range: January 1,1753,through December 31,9999
Accuracy: Rounded to increments of .000,.003,or .007 seconds
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