vue 按钮点击前一天，后一天改变日期

<template>
	<div>{{dateTime}}</div>
	<div>
		<button @click="prevDate">前一天</button>
		<button @click="nextDate">后一天</button>
	</div>
</template>
<script>
data() {
    return {
    	selDateTimes:"2020-01-21"
    },
    methods: {
    	prevDate() {
	      //前一天
	        let odata = new Date(
	          new Date(this.selDateTimes).getTime() - 24 * 60 * 60 * 1000
	        ); //计算当前日期 -1
	        this.selDateTimes = this.convertToDate(odata); //格式化日期并赋值
	    },
	    nextDate() {
	      //后一天
	        let odata = new Date(
	          new Date(this.selDateTimes).getTime() + 24 * 60 * 60 * 1000
	        ); //计算当前日期 +1
	        this.selDateTimes = this.convertToDate(odata); //格式化日期并赋值
	    },
	    convertToDate(date) {
	      var date = new Date(date);
	      var y = date.getFullYear();
	      var m = date.getMonth() + 1;
	      var d = date.getDate();
	      m = m < 10 ? "0" + m : m; //月小于10，加0
	      d = d < 10 ? "0" + d : d; //day小于10，加0
	      return y + "-" + m + "-" + d;
	    }
	}
}
</script>