通过系统time来获取上月的开始和结束日期

package main

import (
    "fmt"
    "time"
)

const DATE_FORMAT = "2006-01-02"

func main() {
    year,month,_ := time.Now().Date()
    thisMonth := time.Date(year,1,0,time.Local)
    start := thisMonth.AddDate(0,-1,0).Format(DATE_FORMAT)
    end := thisMonth.AddDate(0,-1).Format(DATE_FORMAT)
    timeRange := fmt.Sprintf("%s~%s",start,end)
    fmt.Println(timeRange)
}