Switch needs to default to certain values when the switch is on

I have a switch that defaults to off initially but when it is turned on I want the input for Saturday From to show 12:00AM and Saturday To to show 11:59PM. How do I do this with the code below?

      <b-row class="pb-0">
                              <b-col>
                                <h2>Weekends</h2>
                                <b-form-checkbox switch v- 
              model="providerScheduleDays.isWeekend24Hours" value="accepted"> 24 
           Hours</b-form- 
                checkbox>
                              </b-col>
                            </b-row>
                            <b-row>
                              <b-col lg="6">
                                <!-- <strong>Saturday</strong> -->
                                <common-forminputs-btextinputwithvalidation
                                  
                :rules="`compare_to_end_time:${providerScheduleDays.saturdayCloseHour}`"
                                  label="Saturday From"
                                  requiredDisplayName="From"
                                  v-model="providerScheduleDays.saturdayOpenHour"
                                  id="providerSaturdayOpen"
                                  name="providerSaturdayOpen"
                                  labelClass="w-50 pl-2"
                                  inputClass="mb-2"
                                  type="time"
                                />
                              </b-col>
                              <b-col lg="6">
                                <!-- <strong>Wednesday</strong> -->
                                <common-forminputs-btextinputwithvalidation
                                  
            :rules="`compare_to_start_time:${providerScheduleDays.saturdayOpenHour}`"
                                  label="Saturday To"
                                  requiredDisplayName="To"
                                  v-model="providerScheduleDays.saturdayCloseHour"
                                  id="providerSaturdayClose"
                                  name="providerSaturdayClose"
                                  labelClass="w-50 pl-2"
                                  inputClass="mb-2"
                                  type="time"
                                />
                              </b-col>
           </b-row>

Come on someone please help. All these vue experts in here and no one has any ideas on how to do this.