dayjs 绑定Vue时间控件时传值问题

<el-date-picker v-model="finishDate" type="date"></el-date-picker>

return {
    finishDate: dayjs().format('YYYY-MM-DD'),
}

async Func() {
        call({
          date: this.finishDate.ToString(),--不转传的值是datetime类型
        }).then((res) => {
          let { message, code } = res.data
          this.$baseMessage(message, code === 0 ? 'success' : 'error')
        })
      },