How to access global variables

Question

How do I access a variable that was declared/init in my main.go in a different .go package/file? Keeps telling me that the variable is undefined (I know that global variables are bad but this is just to be used as a timestamp)

in main.go

var StartTime = time.Now() func main(){...} 

trying to access StartTime in a different .go file but keep getting StartTime undefined

Answer 1

I create a file dif.go that contains your code:

package dif  import (     "time" )  var StartTime = time.Now() 

Outside the folder I create my main.go, it is ok!

package main  import (     dif "./dif"     "fmt" )  func main() {     fmt.Println(dif.StartTime) } 

Outputs:

2016-01-27 21:56:47.729019925 +0800 CST 

Files directory structure:

folder   main.go   dif     dif.go 

It works!

Answer 2

I would "inject" the starttime variable instead, otherwise you have a circular dependency between the packages.

main.go

var StartTime = time.Now() func main() {    otherPackage.StartTime = StartTime } 

otherpackage.go

var StartTime time.Time