public static DateTime Evaluate(string value)
{
DateTime result;
if (DateMath.TryEvaluate(value, out result))
{
return(result);
}
throw new FormatException("Invalid format: '" + value + "'.");
}
public static bool TryParse(string value, out DateTimeWindow result)
{
if (string.IsNullOrEmpty(value))
{
throw new ArgumentNullException("value");
}
var match = StringFormatExpression.Match(value);
if (!match.Success)
{
result = null;
return(false);
}
var startExpr = match.Groups["start"].Value;
DateTime?start = null;
if (startExpr != "*" && !DateMath.TryEvaluate(startExpr, out start))
{
result = null;
return(false);
}
var endExpr = match.Groups["end"].Value;
DateTime?end = null;
if (endExpr != "*" && !DateMath.TryEvaluate(endExpr, out end))
{
result = null;
return(false);
}
result = new DateTimeWindow(start, end);
return(true);
}