The less than or equal (<=) operator returns true if the left operand is less than or equal to the right operand, and false otherwise.

The setUTCSeconds() method of Date instances changes the seconds and/or milliseconds for this date according to universal time.

The Date.parse() static method parses a string representation of a date, and returns the date's timestamp.

The setUTCMonth() method of Date instances changes the month and/or day of the month for this date according to universal time.

The toString() method of Date instances returns a string representing this date interpreted in the local timezone.

The getDate() method of Date instances returns the day of the month for this date according to local time.

The every() method of Array instances tests whether all elements in the array pass the test implemented by the provided function. It returns a Boolean value.

The some() method of Array instances tests whether at least one element in the array passes the test implemented by the provided function. It returns true if, in the array, it finds an element for which the provided function returns true; otherwise it returns false. It doesn't modify the array.

The with() method of Array instances is the copying version of using the bracket notation to change the value of a given index. It returns a new array with the element at the given index replaced with the given value.

The Array() constructor creates Array objects.