What is getDate() in JavaScript?

// EXAMPLE 1
console.log("Example 1: Date as a string:");
const dayInMonth =  new Date('Jul 11 2011');
const day1 = dayInMonth.getDate();
console.log(day1)
//EXAMPLE 2
console.log("Example 2: Date as ISOString"); 
const dayInMonthIsos = new Date('2020-06-13T18:30:00.000Z');
const dayIsos = dayInMonthIsos.getDate();
console.log(dayIsos);
//EXAMPLE 3
console.log("EXAMPLE 3: Date as UTCString");
const dayInMonthUtc = new Date('Sat, 13 Jun 2020 18:30:00 GMT');
const dayUtc = dayInMonthUtc.getDate();
console.log(dayUtc);
//EXAMPLE 4
console.log("Example 4: Date as LocaleDateString");
 
const dayInMonthLocale = new Date('6/14/2020');
const dayLocale = dayInMonthLocale.getDate();
console.log(dayLocale);
//EXAMPLE 5
console.log("Example 5: Date as parameters");
 
const dayInMonthPara = new Date(12, 13, 01);
const dayPara = dayInMonthPara.getDate();
console.log(dayPara);
//EXAMPLE 6
console.log("Example 6: Date without parameters");
 
const dayInNoPara = new Date();
const dayNoPara = dayInNoPara.getDate();
console.log(dayNoPara);