Golang of time. The Pit of format

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Golang of time. Format design and other languages are not the same, other languages always use some formatting characters to mark, and Golang, check out some of the online pit examples of their own Golang the source, found the following code

// String returns the time formatted using the format string//  "2006-01-02 15:04:05.999999999 -0700 MST"funcstring {    return t.Format("2006-01-02 15:04:05.999999999 -0700 MST")}

Try to write 2006-01-02 15:04:05 to your own example

funcstring {    return time.Now().Format("2006-01-02 15:04:05")}

The result is returned correctly. Asked the next, it is said that this date is the day of the birth of Golang ... I'm so narcissistic ...