time in go

package main

import "fmt"
import "time"

func main() {
    
    fmt.Println("time in seconds    : ", time.Seconds());
    fmt.Println("time in nanoseconds: ", time.Nanoseconds());
    
    fmt.Println("sleep 1 second.");

    time.Sleep(1*1000*1000*1000);

    fmt.Println("time in seconds    : ", time.Seconds());
    fmt.Println("time in nanoseconds: ", time.Nanoseconds());

    fmt.Println("wait sleep 1 second.");
    before := time.Nanoseconds();
    time.Sleep(1*1000*1000*1000);
    after := time.Nanoseconds();
    fmt.Println("difference of nanoseconds: ", (after-before));
    
    t:=time.LocalTime();
    fmt.Println("time.String(): ", t.String());
}

time.Seconds() get the time as unix time in seconds
time.Nanoseconds() dito
time.Sleep(x) sleep for x nanoseconds
to sleep 1 second do time.Sleep(1e9)


to get any type back from function
let look:

package main

import "fmt"
import "rand"
import "time"

func my() interface{} {

    rand.Seed(time.Nanoseconds()/1000000);

    switch rand.Intn(3) {
        case 0: var i int; i=4; return i;
        case 1: var f float; f=2.3; return f;
        case 2: var s string; s="blub"; return s;
    }
    var b byte;
    b='c';
    return b;
}

func main() {
    fmt.Println(my());
    time.Sleep(1e9);
    fmt.Println(my());
    time.Sleep(1e9);
    fmt.Println(my());
    time.Sleep(1e9);
    fmt.Println(my());
    time.Sleep(1e9);
    fmt.Println(my());
}

with func my() interface{} {...} we declare a function which return an interface. This is a void interface, which can implement all types. Thus we can back every typ back. The my() function simple init the rand and get randomly different types back.