我不能在golang中使用变量进行时间计算吗？ [重复]

Question

This question already has an answer here:

• How to multiply duration by integer? 5 answers

I'm trying to calculate the time 10 minutes ago. Why can't I do this calculation with variables (usable for a for loop). See -

package main

import (
    "fmt"
    "time"
)

func main() {

    // the time now
    fmt.Println(time.Now())

    // the time 50 minutes ago - WORKS
    diff := (60 - 10) * time.Minute
    newTime := time.Now().Add(-diff)
    fmt.Println(newTime)

    // the time 50 minutes ago - DOESN'T WORKS!
    i := 10
    diff = (60 - i) * time.Minute
    newTime = time.Now().Add(-diff)
    fmt.Println(newTime)
}

Why diff = (60 - i) * time.Minute doesn't work? This is the error I'm getting -

prog.go:20: invalid operation: (60 - i) * time.Minute (mismatched types int and time.Duration)

For Go Playground: https://play.golang.org/p/TJ03K0ULg2

Thanks a lot!

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Answer 1

Like the error says, you have mismatched types. Convert the integer result to a time.Duration:

diff = time.Duration(60-i) * time.Minute