To compare dates in JavaScript, you can use the comparison operators (<, >, <=, >=, ==, !=, ===, !==) or the Date object’s methods.

Here are some examples:

1. Using comparison operators:

var date1 = new Date("2022-01-01");
var date2 = new Date("2022-02-01");

if (date1 < date2) {
  console.log("date1 is before date2");
} else if (date1 > date2) {
  console.log("date1 is after date2");
} else {
  console.log("date1 is equal to date2");
}

In the above example, two Date objects (date1 and date2) are created with different dates. The < operator is used to compare the two dates, and the output will be “date1 is before date2” because date1 is earlier than date2.

2. Using getTime() method:

var date1 = new Date("2022-01-01");
var date2 = new Date("2022-02-01");

if (date1.getTime() < date2.getTime()) {
  console.log("date1 is before date2");
} else if (date1.getTime() > date2.getTime()) {
  console.log("date1 is after date2");
} else {
  console.log("date1 is equal to date2");
}

In the above example, the getTime() method is used to get the time value of each Date object. The < operator is used to compare the two time values, and the output will be “date1 is before date2” because date1 is earlier than date2.

Note that when comparing Date objects using the comparison operators, the dates are converted to their numeric equivalents (i.e. the number of milliseconds since January 1, 1970), so the comparison is based on the time values rather than the date values. If you only want to compare the date values, you may need to use additional logic to extract the date components and compare them separately.