public static DateTime ToDateTime(this string txt)
{
if (string.IsNullOrEmpty(txt))
{
return(DateTime.MinValue);
}
string text = txt.Trim().ToLower();
if (!text.StartsWith("$"))
{
return(DateTime.Parse(text));
}
if (text == "${today}")
{
return(DateTime.Today);
}
if (text == "${yesterday}")
{
return(DateTime.Today.AddDays(-1.0));
}
if (text == "${tommorrow}")
{
return(DateTime.Today.AddDays(1.0));
}
if (text == "${t}")
{
return(DateTime.Today);
}
if (text == "${t-1}")
{
return(DateTime.Today.AddDays(-1.0));
}
if (text == "${t+1}")
{
return(DateTime.Today.AddDays(1.0));
}
if (text == "${today+1}")
{
return(DateTime.Today.AddDays(1.0));
}
if (text == "${today-1}")
{
return(DateTime.Today.AddDays(-1.0));
}
string dateStr = text.Substring(2, text.Length - 1 - 2);
return(DateParser.ParseTPlusMinusX(dateStr));
}
public static DateTime ParseTPlusMinusX(string dateStr)
{
return DateParser.ParseTPlusMinusX(dateStr, DateTime.MinValue);
}