Datetime 格式 转化
2017-7-27 DateTime.TryParse(“”27JUL17“”, new CultureInfo("en-us"), DateTimeStyles.None, out d) 2017-01-01 12:00:00 DateTime.TryParseExact(“”20170101 12:00:00“”, "yyyyMMdd HH:mm:ss",CultureInfo.InvariantCulture, DateTimeStyles.None, out d)
DateTime.Now.ToString("yyyyMMdd HH:mm:ss:fffffff") //最多7个f
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