convert(varchar(10)，docdate，101)参见 ^ ]

convert(varchar(10),docdate, 101) see here[^]

此处提供了DateTime 的几种转换格式

http://www.sqlusa.com/bestpractices/datetimeconversion/ [

Several conversion formats for DateTime are given here

http://www.sqlusa.com/bestpractices/datetimeconversion/[^]

it may be helpful to you.