HTML:
<lightning-input-field field-name=”StartTime__c”></lightning-input-field>
JavaScript
import StartTime from ‘@salesforce/schema/ObjectName__c.StartTime__c’;
const inputFields = this.template.querySelectorAll(‘lightning-input-field’);
if (inputFields) {
inputFields.forEach(field => {
if(field.fieldName == StartTime.fieldApiName) {
starttime = new Date(field.value).toLocaleString(“ja-JP”); // GMT ⇒ 日本時間
} if(field.fieldName == EndTime.fieldApiName) {
endtime = new Date(field.value).toLocaleString(“ja-JP”);
}
});
}