format a date in to the format 'yyyy-mm-dd hh:mm:ss.fff zzz' in go

You can use the time package in go to format a date to the desired format. The package provides a function Format which can be used to convert a time.Time to a string representation.

Here's an example code snippet:

main.go
package main

import (
	"fmt"
	"time"
)

func main() {
	// create a time object with the current date and time
	t := time.Now()

	// set the timezone
	loc, _ := time.LoadLocation("America/New_York")

	// convert the time to the desired format
	formattedTime := t.In(loc).Format("2006-01-02 15:04:05.000 MST")

	// output the formatted time
	fmt.Println(formattedTime)
}
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In the code above, we first create a time.Time object with the current date and time using the Now() function. We then set the timezone to "America/New_York" using the LoadLocation() function. Finally, we convert the time object to the desired format using the Format() function and output the formatted time.

The format string "2006-01-02 15:04:05.000 MST" is a reference to the desired output format. It is important to note that the reference date used in the format string ("2006-01-02 15:04:05.000") is not arbitrary, but rather a specific date used as a reference in go's time package.

The output of the code will be something like:

main.go
2022-09-23 16:08:34.100 EDT
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where EDT is the timezone abbreviation for Eastern Daylight Time.