How to Convert Go's UnixNano Timestamp to Milliseconds?

Converting Go's UnixNano to Milliseconds

In Go, the time.Now().UnixNano() function provides a timestamp with nanosecond precision. To obtain the timestamp in milliseconds, you can perform the necessary conversion.

For Go v1.17 and Later:

As of Go v1.17, the time package includes the UnixMicro() and UnixMilli() functions, making the conversion straightforward:

timestamp := time.Now().UnixMilli()

For Go v1.16 and Earlier:

Prior to Go v1.17, you can convert the nanosecond timestamp to milliseconds using division:

func makeTimestamp() int64 {
    return time.Now().UnixNano() / 1e6
}

Here, 1e6 represents the number of nanoseconds in a millisecond.

Below is a sample program that demonstrates the conversion:

package main

import (
    "fmt"
    "time"
)

func main() {
    timestamp := makeTimestamp()

    fmt.Printf("%d \n", timestamp)
}

func makeTimestamp() int64 {
    return time.Now().UnixNano() / 1e6
}

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