'In Parse() function, why the time.ANSIC layout didn't work in Go?

I am currently studying time library and I am not sure why the time.ANSIC at layout part didn't work what I expected. In Parse() function there is a syntax func Parse (layout, value string) and based on my understanding I can use in layout part like time.UnixDate, ANSIC, RFC3339 etc.

When I code like below

const layout = "Jan 2, 2006 at 3:04pm (MST)"
    sm, _ := time.Parse(layout, "Feb 4, 2014 at 6:05pm (PST)")
    fmt.Println(sm)

It works as well and I got 2014-02-04 18:05:00 +0000 PST.

However, when I add time.ANSIC at layout part

tm, _ := time.Parse(time.ANSIC, "Feb 4, 2014 at 6:05pm (PST)")
    fmt.Println(tm)

I got 0001-01-01 00:00:00 +0000 UTC.

I am not sure why do I get any time. I really appreciate your help!

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'In Parse() function, why the time.ANSIC layout didn't work in Go?

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