Golang在时间格式之间转换

Question

I am trying to parse a time string which is transported on the wire as JSON. In the below code, I am just experimenting the time parsing as part of that:

currentTime := time.Now().String()
//currentTime has the time
t1, _ := time.Parse(time.RFC3339, currentTime)
fmt.Println(t1.String())

The last but one line mangles the time and produces the output: 0001-01-01 00:00:00 +0000 UTC

See this GoPlayground:https://play.golang.org/p/Q_G_qYcnaHP

What am I missing?

Answer 1

First you're omitting the error returned by time.Parse(). Never omit errors.

If you print the error:

currentTime := time.Now().String()
t1, err := time.Parse(time.RFC3339, currentTime)
fmt.Println(err)
fmt.Println(t1.String())

Output (try it on the Go Playground):

parsing time "2009-11-10 23:00:00 +0000 UTC m=+0.000000001" as "2006-01-02T15:04:05Z07:00": cannot parse " 23:00:00 +0000 UTC m=+0.000000001" as "T"
0001-01-01 00:00:00 +0000 UTC

The problem is that Time.String() produces the text representation in a different format than specified by time.RFC3339. Time.String() produces output using the format:

"2006-01-02 15:04:05.999999999 -0700 MST"

While you attempt to parse it from the format:

RFC3339 = "2006-01-02T15:04:05Z07:00"

Obviously that won't work.