npm i --save easy-vue-calendar

<template>
    <EasyCalendar 
      :items="items"
      @dayClicked="dayClicked"
      @itemClicked="itemClicked"
      @prevMonthClicked="prevMonthClicked"
      @nextMonthClicked="nextMonthClicked"
      v-model="daySelected"
    />
</template>

<script>
    import EasyCalendar from 'easy-vue-calendar'
    export default {
        components: {
            EasyCalendar
        }
        data () {
            return {
                items: [
                    {
                        title: 'test',
                        day: '2020-06-10',
                        background: '#000',
                        color: '#FFF',
                        // Other data...
                    }
                ],
                daySelected: '2020-03-15'
            }
        },
        methods: {
            dayClicked ($event) {
                console.log($event)
            },

            itemClicked ($event) {
                console.log($event)
            },

            prevMonthClicked($event) {
                console.log($event)
            },

            nextMonthClicked ($event) {
                console.log($event)
            }
        },
    }
</script>

<template>
    <EasyCalendar 
      :items="items"
      @dayClicked="dayClicked"
      @itemClicked="itemClicked"
      @prevMonthClicked="prevMonthClicked"
      @nextMonthClicked="nextMonthClicked"
      :showButtonsHeader="true"
      textButtonNext="Next"    <--- Add
      textButtonPrev="Prev"    <--- Add
      :weeks="weeks"           <--- Add
      :months="months"         <--- Add
    />
</template>

<script>
    import EasyCalendar from 'easy-vue-calendar'
    export default {
        name: 'App',
        components: {
            EasyCalendar
        },
        data () {
            return {
                items: [
                    {
                        title: 'teste',
                        day: '2020-06-10'
                    }
                ],
                weeks: ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'],
                months: ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December']
            }
        }
    }
</script>

<template>
    <EasyCalendar 
      ...
      ref="calendar"
    />


</template>

<script>
    import EasyCalendar from 'easy-vue-calendar'
    export default {
        name: 'App',
        components: {
            EasyCalendar
        },
        ...

        methods: {
            nextMonth () {
                this.$refs.calendar.nextMonth() // <--- change next month
            },
            prevMonth () {
                this.$refs.calendar.prevMonth() // <--- change prev month
            }
        }
    }
</script>