Why is the code not working on iphone?

Question

iOS

Method:

disabledDateFrom(date) {
      let dis = true
      let last = null
      let dateForFinish = new Date(date).setHours(23, 59)
      let dateForStart = new Date(date).setHours(0, 0)
      if(this.freDate.length > 0) {
        for (let key in this.freDate) {
          if(this.freDate[key].DateStart) {
            let dateFinish = new Date(this.freDate[key].DateFinish).valueOf()
            let dateStart = new Date(this.freDate[key].DateStart).valueOf()
            if(dateForFinish >  dateStart && dateForStart <  dateFinish){
              dis = false
            }
            last = dateFinish
          } else {
            let dateFinish = new Date(this.freDate[key].DateFinish).valueOf()
            let dateStart = last
            if(dateForFinish > dateStart && dateForStart < dateFinish){
              dis = false
            }
          }
        }
      } else {
        dis = false
      }
      return dis
    },

Component:

<b-form-datepicker
                    v-model="form.dateFrom"
                    :min="minDateTo"
                    :date-disabled-fn="disabledDateFrom"
                    :disabled="disableDateFrom"
                    placeholder="Дата получения"
                    v-bind="labels || {}"
                    :hide-header="true"
                    :dark="true"
                    locale="ru-RU"
                    :date-format-options="{ year: 'numeric', month: 'numeric', day: 'numeric' }"
                    :state="getValidationState(validationContext)"
                ></b-form-datepicker>

Blocks all dates