C#
//将格式为yyyyMMdd的时间转化为yyyy-MM-dd类型
详例：
string beginDate="20140224";
beginDate =DateTime.ParseExact(beginDate,"yyyyMMdd",CultureInfo.CurrentCulture).ToString( "yyyy-MM-dd");
//Server:如何将yyyymmddHHmmss转换为yyyy-MM-dd HH:mm:ss格式
详例：
SELECT CAST(( CAST(CONVERT(DATE, LEFT(CONVERT(NVARCHAR(50), ISNULL(Memo9,
\'19000101000000\')),
8)) AS NVARCHAR(10))
+ \' \'
+ SUBSTRING(CONVERT(NVARCHAR(50), ISNULL(Memo9,
\'19000101000000\')),
9, 2) + \':\'
+ SUBSTRING(CONVERT(NVARCHAR(50), ISNULL(Memo9,
\'19000101000000\')),
11, 2) + \':\'
+ SUBSTRING(CONVERT(NVARCHAR(50), ISNULL(Memo9,
\'19000101000000\')),
13, 2) ) AS DATETIME)
FROM Invoice;
//将System.DateTime对象的值转换为文件时间
Datetime.Now.ToFileTime();
//将文件时间转换为System.DateTime对象
DateTime.FromFileTime();