Golang Time parsing providing the format is returning wrong results

I've got a t time.Time which I'm converting to an specific timezone and from which I need to extract both date and time (separately) as strings as follows:

Data should look like: 2006-09-23
Time should look like: 05:06:23

I'm doing the following:

1. Setting t to the needed timezone:

var err error
	loc, err := time.LoadLocation("America/Los_Angeles")

	if err != nil {
		return err
	} else {
		t = t.In(loc)
	}

2. Setting up the format and converting it to string so I can extract its values:

format := "2006-01-02 15:03:04"
timestamp := t.Format(format)
timestampSlice := strings.Fields(timestamp)

fmt.Println(timestampSlice[0])
fmt.Println(timestampSlice[1])

But I'm getting unexpected results for time (date works fine):

When passing

time.Date(2021, time.Month(2), 21, 1, 10, 30, 0, time.UTC)

I'd expect
2021-02-20 and 17:10:30
but I'm getting:
17:05:10 for the time

When passing

time.Date(2022, time.Month(8), 26, 22, 7, 30, 0, time.FixedZone("Asia/Shanghai", 0)),

I'd expect
2022-08-26 and 06:07:30
but I'm getting:
15:03:07

what am I doing wrong? does the values passed in the format have any effect in the parsing? I thought the format was only to signal the way the result should look

From the docs:

	// Jan 2 15:04:05 2006 MST
	//	 1 2  3  4  5    6  -7

So the format 2006-01-02 15:03:04 would be parsed as years-months-days hours-hours-minutes. Note that 15 refers to the hours (00-23), that 03 refers to the hours (1-12), and 04 refers to the minutes.

So the correct format would be

format := "2006-01-02 15:04:05"

You can learn more about formatting time here: https://pkg.go.dev/time#example-Time.Format