/// <summary>
/// Validates a date string (using Gregorian calendar)
/// </summary>
public static bool IsValidDate(string dateString, DatePartsOrder datePartsOrder = DatePartsOrder.MDY)
{
if (string.IsNullOrWhiteSpace(dateString))
{
return(false);
}
if (dateString.Length < 5)
{
return(false);
}
var parts = dateString.Split(new char[] { '.', '/' });
if (parts.Length != 3)
{
return(false);
}
Func <string, int> parsePart = s =>
{
s = s.Trim();
if (s.Length == 0)
{
return(-1);
}
int ret = 0;
if (!int.TryParse(s, out ret))
{
return(-1);
}
return(ret);
};
int part1 = parsePart(parts[0]);
if (part1 == -1)
{
return(false);
}
int part2 = parsePart(parts[1]);
if (part2 == -1)
{
return(false);
}
int part3 = parsePart(parts[2]);
if (part3 == -1)
{
return(false);
}
int m, d, y;
switch (datePartsOrder)
{
case DatePartsOrder.MDY:
m = part1;
d = part2;
y = part3;
break;
case DatePartsOrder.YMD:
y = part1;
m = part2;
d = part3;
break;
case DatePartsOrder.DMY:
d = part1;
m = part2;
y = part3;
break;
default:
throw new NotImplementedException("Unsupported DatePartsOrder.");
}
// Up for debate, but in practical terms, a year so much in the future is probably not
// the intent of validating a date in a typical user input scenario.
if (y < 1 || y > 2200 || m < 1 || m > 12 || d < 1)
{
return(false);
}
if (m == 1 || m == 3 || m == 5 || m == 7 || m == 8 || m == 10 || m == 12)
{
if (d > 31)
{
return(false);
}
}
else if (m == 2)
{
if (DateTime.IsLeapYear(y))
{
if (d > 29)
{
return(false);
}
}
else if (d > 28)
{
return(false);
}
}
else if (d > 30)
{
return(false);
}
return(true);
}
/// <summary>
/// Validates a date string (using Gregorian calendar)
/// </summary>
static public bool IsValidDate(string dateString, DatePartsOrder datePartsOrder = DatePartsOrder.MDY)
{
if (string.IsNullOrWhiteSpace(dateString))
return false;
if (dateString.Length < 5)
return false;
var parts = dateString.Split(new char[] {'.', '/'});
if (parts.Length != 3)
return false;
Func<string, int> parsePart = s =>
{
s = s.Trim();
if (s.Length == 0)
return -1;
int ret = 0;
if (!int.TryParse(s, out ret))
return -1;
return ret;
};
int part1 = parsePart(parts[0]);
if (part1 == -1)
return false;
int part2 = parsePart(parts[1]);
if (part2 == -1)
return false;
int part3 = parsePart(parts[2]);
if (part3 == -1)
return false;
int m, d, y;
switch (datePartsOrder)
{
case DatePartsOrder.MDY:
m = part1;
d = part2;
y = part3;
break;
case DatePartsOrder.YMD:
y = part1;
m = part2;
d = part3;
break;
case DatePartsOrder.DMY:
d = part1;
m = part2;
y = part3;
break;
default:
throw new NotImplementedException("Unsupported DatePartsOrder.");
}
// Up for debate, but in practical terms, a year so much in the future is probably not
// the intent of validating a date in a typical user input scenario.
if (y < 1 || y > 2200 || m < 1 || m > 12 || d < 1)
return false;
if (m == 1 || m == 3 || m == 5 || m == 7 || m == 8 || m == 10 || m == 12)
{
if (d > 31)
return false;
}
else if (m == 2)
{
if (DateTime.IsLeapYear(y))
{
if (d > 29)
return false;
}
else if (d > 28)
return false;
}
else if (d > 30)
{
return false;
}
return true;
}
