获取上个月的起始时间和结束时间
getLastMonthDate(param){
                var nowdays = new Date();
                var year = nowdays.getFullYear();
                var month = nowdays.getMonth();
                if(month==0){
                    month = 12;
                    year = year-1;
                }
                if(month<10){
                    month = '0'+month;
                }
                var myDate = new Date(year,month,0);
                var startDate = year+'-'+month+'-01 00:00:00'; //上个月第一天
                var endDate = year+'-'+month+'-'+myDate.getDate()+' 23:59:00';//上个月最后一天
                console.log("startDate"+startDate+"endDate"+endDate)
                if(param == '0'){
                    return startDate;
                }
                if(param == '1'){
                    return endDate;
                }
            },

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, month, 1, 0, 0, 0, 0, time.Local)
    start := thisMonth.AddDate(0, -1, 0).Format(DATE_FORMAT)
    end := thisMonth.AddDate(0, 0, -1).Format(DATE_FORMAT)
    timeRange := fmt.Sprintf("%s~%s", start, end)
    fmt.Println(timeRange)
}

获取如 2020-6-11 到 2020-5-11 排除大小月   本月是大月上月小月为30
    // 获取上月日期
    getPrevDate(date) {
      var arr = date.split('-');
      // 获取当前日期的年份
      var year = arr[0];
      // 获取当前日期的月份
      var month = arr[1];
      var day = arr[2];
      var prevYear = year;
      var prevMonth = parseInt(month) - 1;
      if (prevMonth === 0) {
        // 如果是1月份，则取上一年的12月份
        prevYear = parseInt(prevYear) - 1;
        prevMonth = 12;
      }
      var prevDay = day;
      // 如果原来日期大于上一月的日期，则取当月的最大日期。比如3月的30日，在2月中没有30
      var days2 = new Date(prevYear, prevMonth, 0).getDate();
      if (prevDay > days2) prevDay = days2;
      var prevDate = prevYear + '-' + prevMonth + '-' + prevDay;
      return prevDate;
    }

今天突然发现个快速计算时间的方法记录下适用于JAVA8

public static String getLastMonth() {
        LocalDate today = LocalDate.now();
        today = today.minusMonths(1);
        DateTimeFormatter formatters = DateTimeFormatter.ofPattern("yyyy-MM");
        return formatters.format(today);
    }

 

转载至 https://blog.csdn.net/qacjava/article/details/81536766