package main

import (
	"fmt"
	"time"
)

func main() {
	now := time.Now()
	ts := now.Unix()
	loc, _ := time.LoadLocation("Asia/Shanghai")
	tm := time.Unix(ts, 0).In(loc)
	fmt.Printf("%s.%d", tm.Format("2006-01-02_15:04:05"), now.UnixMilli()%1000)
}