Common codes for operating dates in ASP.NET

using System;

namespace My.Utils {
///

/// Common tools for date operations
///

public class DateUtils {
public DateUtils() {
}

                                                                                                                                             summary>
                                                                                                                                                                                                                                                  static int DiffYear (string start) {
                                                                                                                                                return DiffYear(Convert.ToDateTime(start));
/// & lt;/summary & gt;
/// & lt; param name = "start" & gt; start date & lt;/param & gt;
/// & lt; param name = "end" & gt; The end of the end & lt;/Param & gt;
/// & lt; RetUrns & GT; URN Diffyear (Convert.todateTime (Start ), Convert.ToDateTime(end));
}

                                                                                                                                            ​ ## /// Start date
/// Year difference from the current date
public static int DiffYear (DateTime start) {
                                                                                                                using   with   use using ’         through using ’ ’s ’ through ’ using ’s ’ using ’s ’ using ‐ ‐ ‐ ‐‐ ‐                                                                       to  
/// & lt;/summary & gt;
/// & lt; param name = "start" & gt; start date & lt;/param & gt;
/// & lt; param name = "end" & gt; The end of the end & lt;/Param & gt;
/// & lt; RetUrns & GT; # RETURN (End.year -Start. Year);
}

/// & lt; Summary & gt;
/// Format the date of the day (yyyy-mm-dd)
/// & lt;/summary & gt;
/// Formatted date string
public static string DateFormat () {
return DateFormat(DateTime.Now);
}

                                                                                                                                                                         ; The date of formatting & lt;/param & gt;
/// & lt; Return & gt; Formatted date string & lt;/Return & GT;
Public String DateFormat (String Date) {
Return dateformat (Convert.ToDateTime(date));
}

                                                                                                                                                                               // Date to be formatted
/// Format string
// Formatted date string
public static string DateFormat (string date, string format) {
return DateFormat(Convert.ToDateTime(date), format);
    }

                                                                                                                    using/// Date to be formatted
/// Formatted date string
public static string DateFormat (DateTime date) {
                                                            return DateFormat(date, "yyyy-MM-dd");
///
/// Date to be formatted
">Format string
/// Formatted date string
public static string DateFormat (DateTime date, string format) {
Return date.ToString(format);
/// The date and time to be formatted
/// The formatted date and time string
public static string DateTimeFormat (DateTime datetime) {
                                                                                                                                                                                      return DateTimeFormat(datetime, "yyyy-MM-dd HH:mm"); // Format date and time
Format string
/// Formatted date and time string
Public static string DateTimeFormat (DateTime datetime, string format) {
                                                      return datetime.ToString(format);
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