Date Utils.
2016/14/23 fromString was removed as its extra date validity checking had problems in
many timezones so it became the same as Date.fromString.
Be careful with unsafeFromString it will Debug.crash() if it cant parse date.
Return a list of days dayLength long for successive days starting from startDate.
Return iso week values year, week, isoDayOfWeek. Input date is expected to be in local time zone of vm.
Return date of start of ISO week one for given year.
Copyright (c) 2016 Robin Luiten
Utility for known input string date creation cases. Checks for a fail just in case and calls Debug.crash().