element +vue2 结束时间不能在开始时间之前

最简版本 只限制了结束时间不能在开始时间前 后续有使用到在详细完善功能

<el-row :gutter="20">
                    <el-col :span="5">
                        <el-form-item label="预计进企时间" prop="gmtInto" :rules="rules.gmtInto">
                            <el-date-picker size="small" :picker-options="pickerOptionsStart"  v-model="formData.gmtInto" type="datetime" value-format="yyyy-MM-dd HH:mm" placeholder="选择日期时间">
                            </el-date-picker>
                        </el-form-item>
                    </el-col>
                    <el-col :span="5">
                        <el-form-item label="预计离企时间" prop="gmtLeave" :rules="rules.gmtLeave">
                            <el-date-picker size="small" :picker-options="pickerOptionsEnd" v-model="formData.gmtLeave" type="datetime" value-format="yyyy-MM-dd HH:mm" placeholder="选择日期时间">
                            </el-date-picker>
                        </el-form-item>
                    </el-col>
                </el-row>


 data() {
            return {
      		formData:{},
                pickerOptionsStart: {
                    disabledDate: (time) => {
                        if (this.formData.gmtLeave) {
                            return (
                                time.getTime() > new Date(this.formData.gmtLeave).getTime()
                            );
                        }
                    }
                },
                pickerOptionsEnd: {
                    disabledDate: (time) => {
                        if (this.formData.gmtInto) {
                            return (
                                time.getTime() < new Date(this.formData.gmtInto).getTime()
                            );
                        }
                    }
                },
            }
        },