public static Nullable <DateTime> ToDate2(string str)
{
/*input yyyyMMdd*/
try
{
if (str == null)
{
return(null);
}
if (str.Length != 8)
{
return(null);
}
int year = NumUtil.ParseInteger(str.Substring(0, 4));
int month = NumUtil.ParseInteger(str.Substring(4, 2));
int day = NumUtil.ParseInteger(str.Substring(6, 2));
var d = DateTime.ParseExact(str, "yyyyMMdd", null);
if (d.Year < 1500)
{
year += 543;
str = year.ToString("0000") + month.ToString("00") + day.ToString("00");
}
else if (d.Year > 2500)
{
year -= 543;
str = year.ToString("0000") + month.ToString("00") + day.ToString("00");
}
return(DateTime.ParseExact(str, "yyyyMMdd", null));
}
catch
{
return(null);
}
}
public static Nullable <DateTime> ToDate(string str, string indicator = "/")
{
try
{
if (str == null)
{
return(null);
}
int day = 0;
int month = 0;
int year = 0;
string[] indicators = { indicator };
var datesplit = str.Split(indicators, StringSplitOptions.RemoveEmptyEntries);
if (datesplit.Length == 3)
{
day = NumUtil.ParseInteger(datesplit[0]);
month = NumUtil.ParseInteger(datesplit[1]);
year = NumUtil.ParseInteger(datesplit[2].Substring(0, 4));
}
if (str.Contains(":"))
{
int hour = 0;
int min = 0;
int sec = 0;
var dsplte = str.Split(' ');
if (dsplte.Length == 2)
{
dsplte = dsplte[1].Split(':');
if (dsplte.Length == 2)
{
hour = NumUtil.ParseInteger(dsplte[0]);
min = NumUtil.ParseInteger(dsplte[1]);
if (string.IsNullOrEmpty(dsplte[0]) && string.IsNullOrEmpty(dsplte[1]))
{
str = str.Replace(":", "").Trim();
}
//var d = DateTime.ParseExact(str, "dd" + indicator + "MM" + indicator + "yyyy HH:mm", null);
if (year < 1500)
{
year += 543;
str = day.ToString("00") + indicator + month.ToString("00") + indicator + year.ToString() + " " + hour.ToString("00") + ":" + min.ToString("00");
}
else if (year > 2500)
{
year -= 543;
str = day.ToString("00") + indicator + month.ToString("00") + indicator + year.ToString() + " " + hour.ToString("00") + ":" + min.ToString("00");
}
return(DateTime.ParseExact(str, "dd" + indicator + "MM" + indicator + "yyyy HH:mm", null));
}
else if (dsplte.Length == 3)
{
hour = NumUtil.ParseInteger(dsplte[0]);
min = NumUtil.ParseInteger(dsplte[1]);
sec = NumUtil.ParseInteger(dsplte[2]);
if (string.IsNullOrEmpty(dsplte[0]) && string.IsNullOrEmpty(dsplte[1]) && string.IsNullOrEmpty(dsplte[2]))
{
str = str.Replace(":", "").Trim();
}
//var d = DateTime.ParseExact(str, "dd" + indicator + "MM" + indicator + "yyyy HH:mm:ss", null);
if (year < 1500)
{
year += 543;
str = day.ToString("00") + indicator + month.ToString("00") + indicator + year.ToString() + " " + hour.ToString("00") + ":" + min.ToString("00") + ":" + sec.ToString("00");
}
else if (year > 2500)
{
year -= 543;
str = day.ToString("00") + indicator + month.ToString("00") + indicator + year.ToString() + " " + hour.ToString("00") + ":" + min.ToString("00") + ":" + sec.ToString("00");
}
return(DateTime.ParseExact(str, "dd" + indicator + "MM" + indicator + "yyyy HH:mm:ss", null));
}
}
}
else
{
var d = DateTime.ParseExact(str, "dd" + indicator + "MM" + indicator + "yyyy", null);
if (d.Year < 1500)
{
year += 543;
str = day.ToString("00") + indicator + month.ToString("00") + indicator + year.ToString();
}
else if (d.Year > 2500)
{
year -= 543;
str = day.ToString("00") + indicator + month.ToString("00") + indicator + year.ToString();
}
return(DateTime.ParseExact(str, "dd" + indicator + "MM" + indicator + "yyyy", null));
}
}
catch
{
return(null);
}
return(null);
}
