Current Selected Date is other than they should be (-1 day)

[krystiank907]

I have problem if I selected day and print this I have date with - 1 day
Problem is when I change firstDayOfWeak, when is default is good.
On the start ViewController I selected currentDay and calendar selected currently date

   let currentDateString = formatter.string(from: Date())
        let cellStateDateString = formatter.string(from: cellState.date)
        if currentDateString ==  cellStateDateString {
                validCell.dataLabel.textColor = selectedMounthColor
                validCell.selectedView.backgroundColor = UIColor.blue
     }

Version 7.1.5
Swift 4
Tested on iPhone X (no on simulator)
My code:

    func configureCalendar(_ calendar: JTAppleCalendarView) -> ConfigurationParameters {
        calendarView.scrollToDate(Date(), animateScroll: false)
        testCalendar.timeZone = Calendar.current.timeZone
        testCalendar.locale = Calendar.current.locale
        self.formatter.dateFormat = "yyyy MM dd"
        self.formatter.timeZone = Calendar.current.timeZone
        self.formatter.locale = Calendar.current.locale
        let startDate = formatter.date(from: "2017 01 01")
        let endDate = formatter.date(from: "2100 12 28")
        let firstDayOfWeek: DaysOfWeek = .monday // when I don't set value .monday calendar selected currently date
        
        let parametrs = ConfigurationParameters(startDate: startDate!,
                                                endDate: endDate!,
                                                calendar: testCalendar,
                                                firstDayOfWeek: firstDayOfWeek)
        return parametrs
    }

func calendar(_ calendar: JTAppleCalendarView, didSelectDate date: Date, cell: JTAppleCell?, cellState: CellState) {
        print(date) // date -1Day
        handleCellSelected(view: cell, cellState: cellState)
        handleCellTextColor(view: cell, cellState: cellState)
    }

[patchthecode]

This is a very popular question asked for iOS on any calendar library on github.
It happens to people in the East.
We explained it here -> #252

Will close this. Let me know if youre still stuck.