javascript, php and mysql date calculation function

1. javascript：

   /**
   * 日期计算类
   * @author [lee] <[<www.dollarphp.com>]>
   * @param dur 增量 如：+1day -5 year 6months
   * @param time 传入时间 支持格式 1、y-m-d H:i:s 2、1111111111
   * @return 字符串 如：2018-01-01 00:00:00
   */
   function dateParse(time = false,dur){
   this.getDate = function(){
       var test_year = /(-)?\d+(\s)?year(s)?/.exec(dur)
       var test_month = /(-)?\d+(\s)?month(s)?/.exec(dur)
       var test_day = /(-)?\d+(\s)?day(s)?/.exec(dur)
       var test_hour = /(-)?\d+(\s)?hour(s)?/.exec(dur)
       var test_minute = /(-)?\d+(\s)?minute(s)?/.exec(dur)
       var test_second = /(-)?\d+(\s)?second(s)?/.exec(dur)
       test_year = (!test_year)?0:parseInt(test_year[0])
       test_month = (!test_month)?0:parseInt(test_month[0])
       test_day = (!test_day)?0:parseInt(test_day[0])
       test_hour = (!test_hour)?0:parseInt(test_hour[0])
       test_minute = (!test_minute)?0:parseInt(test_minute[0])
       test_second = (!test_second)?0:parseInt(test_second[0])
       var outtime
       if(time){
           if(((typeof(time)=='string') || (time instanceof String)) && (/^\d{4}(-\d{2}(-\d{2})?)?$/.test(time))){
               outtime = new Date(time)
               outtime.setFullYear(parseInt(outtime.getFullYear()) + test_year)
               outtime.setMonth(parseInt(outtime.getMonth()) + test_month)
               outtime.setDate(parseInt(outtime.getDate()) + test_day)
               outtime.setHours(parseInt(outtime.getHours()) + test_hour)
               outtime.setMinutes(parseInt(outtime.getMinutes()) + test_minute)
               outtime.setSeconds(parseInt(outtime.getSeconds()) + test_second)
               var month = this.parseTime(parseInt(outtime.getUTCMonth())+1)
               var date = this.parseTime(parseInt(outtime.getUTCDate()))
               var hour = this.parseTime(parseInt(outtime.getUTCHours()))
               var minute = this.parseTime(parseInt(outtime.getUTCMinutes()))
               var second = this.parseTime(parseInt(outtime.getUTCSeconds()))
           }else{
               outtime = new Date(time*1000)
               outtime.setFullYear(parseInt(outtime.getFullYear()) + test_year)
               outtime.setMonth(parseInt(outtime.getMonth()) + test_month)
               outtime.setDate(parseInt(outtime.getDate()) + test_day)
               outtime.setHours(parseInt(outtime.getHours()) + test_hour)
               outtime.setMinutes(parseInt(outtime.getMinutes()) + test_minute)
               outtime.setSeconds(parseInt(outtime.getSeconds()) + test_second)
               var month = this.parseTime(parseInt(outtime.getMonth())+1)
               var date = this.parseTime(parseInt(outtime.getDate()))
               var hour = this.parseTime(parseInt(outtime.getHours()))
               var minute = this.parseTime(parseInt(outtime.getMinutes()))
               var second = this.parseTime(parseInt(outtime.getSeconds()))
           }
       }else{
           outtime = new Date()
           outtime.setFullYear(parseInt(outtime.getFullYear()) + test_year)
           outtime.setMonth(parseInt(outtime.getMonth()) + test_month)
           outtime.setDate(parseInt(outtime.getDate()) + test_day)
           outtime.setHours(parseInt(outtime.getHours()) + test_hour)
           outtime.setMinutes(parseInt(outtime.getMinutes()) + test_minute)
           outtime.setSeconds(parseInt(outtime.getSeconds()) + test_second)
           var month = this.parseTime(parseInt(outtime.getMonth())+1)
           var date = this.parseTime(parseInt(outtime.getDate()))
           var hour = this.parseTime(parseInt(outtime.getHours()))
           var minute = this.parseTime(parseInt(outtime.getMinutes()))
           var second = this.parseTime(parseInt(outtime.getSeconds()))
       }
       var year = outtime.getFullYear()
       var ret = year+'-'+month+'-'+date+' '+hour+':'+minute+':'+second
       return ret
   }
   this.parseTime = function(input){
       var ret
       if(input >= 0 && input < 10){
           ret = '0'+input
       }else{
           ret = input
       }
       return ret
   }
   }
   var date_parser = new dateParse('2018-05-08','+3hour +2year-5months')
   date = date_parser.getDate()
   console.log(date)

2. php：

   参见：date_add函数

3. mysql：

   参见：DATE_ADD函数