index.js

import Api from '~/service/Api';
import buildFn from '../event/buildCommons.js';
import commonFunctions from '~/mixin/commonFunctions.js';
import moment from 'moment';

export default {
  mixins: [commonFunctions, buildFn],
  methods: {
    calcTenday(){
      let fromDate = this.model.dfdgrp.rec.stttendat;
      let toDate = this.model.dfdgrp.rec.matdat;
     
      let day1 = moment(toDate).format('YYYY-MM-DD');
      let day2 = moment(fromDate).format('YYYY-MM-DD');
      this.model.dfdgrp.rec.tenday = moment(day1).diff(day2, 'days');
    },
  },
};