FSCalendar check today date - swift

Question

How can I check that I clicked on today date?
https://github.com/WenchaoIOS/FSCalendar
I got the below output:
todaydateString = 2020-05-18
dateString = 2020-05-17
which is not matching:
import UIKit
class LoadViewExampleViewController: UIViewController, FSCalendarDataSource, FSCalendarDelegate {
private weak var calendar: FSCalendar!
fileprivate lazy var dateFormatter1: DateFormatter = {
let formatter = DateFormatter()
formatter.dateFormat = "yyyy-MM-dd"
return formatter
}()
let dateString = "2020-05-15"
let dateString1 = "2020-05-16"
let dateString2 = "2020-05-13"
var selectedDates = NSMutableArray()
override func loadView() {
selectedDates = [dateString, dateString1, dateString2]
let view = UIView(frame: UIScreen.main.bounds)
view.backgroundColor = UIColor.groupTableViewBackground
self.view = view
let height: CGFloat = UIDevice.current.model.hasPrefix("iPad") ? 400 : 300
let calendar = FSCalendar(frame: CGRect(x: 0, y: self.navigationController!.navigationBar.frame.maxY, width: self.view.bounds.width, height: height))
calendar.dataSource = self
calendar.delegate = self
calendar.backgroundColor = UIColor.clear
calendar.appearance.todayColor = UIColor.gray
// calendar.appearance.borderDefaultColor = UIColor.black
//calendar.appearance.borderRadius = 0
self.view.addSubview(calendar)
self.calendar = calendar
}
func calendar(_ calendar: FSCalendar, didDeselect date: Date, at monthPosition: FSCalendarMonthPosition) {
let todaydate = Date()
let dateString = self.dateFormatter1.string(from: date)
let todaydateString = self.dateFormatter1.string(from: todaydate)
print("todaydateString = \(todaydateString)")
print("dateString = \(dateString)")
if dateString == todaydateString
{
print("GOOD")
}
}
func calendar(_ calendar: FSCalendar, imageFor date: Date) -> UIImage? {
let dateString = self.dateFormatter1.string(from: date)
if self.selectedDates.contains(dateString) {
let image : UIImage = UIImage(named: "checkbox_Tick")!
return image
}
return UIImage()
}
override func viewDidLoad() {
super.viewDidLoad()
self.title = "FSCalendar"
}
func calendar(_ calendar: FSCalendar, didSelect date: Date, at monthPosition: FSCalendarMonthPosition) {
if monthPosition == .previous || monthPosition == .next {
calendar.setCurrentPage(date, animated: true)
}
}
}