void OnClicked(object sender, System.EventArgs e)
{
DateTime birthday = bday.Date;
int legalAge = 21;
switch (Location.SelectedItem)
{
case "USA":
legalAge = 21;
break;
case "Mexico":
legalAge = 18;
break;
case "Brazil":
legalAge = 21;
break;
case "Australia":
legalAge = 18;
break;
}
DateTime.Compare(birthday, birthday.AddYears(legalAge));
int daysTill21 = (birthday.AddYears(legalAge) - DateTime.Now).Days;
var dateSpan = DateTimeSpan.CompareDates(birthday.AddYears(legalAge), DateTime.Now);
string message = "";
if (daysTill21 > 0)
{
message = $"In {Location.SelectedItem}, You will be able to drink in {dateSpan.Years} years {dateSpan.Months} months {dateSpan.Days} days.";
}
else if (daysTill21 == 0)
{
message = $"Congratulations! In {Location.SelectedItem}, You can drink today!";
}
else
{
message = $"In {Location.SelectedItem}, You have been able to drink for {dateSpan.Years} years {dateSpan.Months} months {dateSpan.Days} days.";
}
output.Text = $"{message}";
}
public static DateTimeSpan CompareDates(DateTime date1, DateTime date2)
{
if (date2 < date1)
{
var sub = date1;
date1 = date2;
date2 = sub;
}
DateTime current = date1;
int years = 0;
int months = 0;
int days = 0;
Phase phase = Phase.Years;
DateTimeSpan span = new DateTimeSpan();
int officialDay = current.Day;
while (phase != Phase.Done)
{
switch (phase)
{
case Phase.Years:
if (current.AddYears(years + 1) > date2)
{
phase = Phase.Months;
current = current.AddYears(years);
}
else
{
years++;
}
break;
case Phase.Months:
if (current.AddMonths(months + 1) > date2)
{
phase = Phase.Days;
current = current.AddMonths(months);
if (current.Day < officialDay && officialDay <= DateTime.DaysInMonth(current.Year, current.Month))
{
current = current.AddDays(officialDay - current.Day);
}
}
else
{
months++;
}
break;
case Phase.Days:
if (current.AddDays(days + 1) > date2)
{
current = current.AddDays(days);
var timespan = date2 - current;
span = new DateTimeSpan(years, months, days, timespan.Hours, timespan.Minutes, timespan.Seconds, timespan.Milliseconds);
phase = Phase.Done;
}
else
{
days++;
}
break;
}
}
return(span);
}