过去用java，python,php,等语言，将一个时间格式化成一个字符串都是用“yyy-MM-dd hh:mm:ss”之类的方法，golang 的格式化方法真令我大开眼界
先看官方文档说明：
func (Time) Format
func (t Time) Format(layout string) string
Format returns a textual representation of the time value formatted according to layout, which defines the format by showing how the reference time, defined to be
Mon Jan 2 15:04:05 -0700 MST 2006
would be displayed if it were the value; it serves as an example of the desired output. The same display rules will then be applied to the time value. Predefined layouts ANSIC, UnixDate, RFC3339 and others describe standard and convenient representations of the reference time. For more information about the formats and the definition of the reference time, see the documentation for ANSIC and the other constants defined by this package.
下面给个代码：
fmt.Println(time.Now().Format("2006-01-02 150405"))
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