ASP.NET日期操作常用代码

using System;

namespace My.Utils {
/// <summary>
/// 日期操作常用工具
/// </summary>
public class DateUtils {
public DateUtils() {
}

/// <summary>
/// 比较日期的年份差
/// </summary>
/// <param name="start">开始日期</param>
/// <returns>与当前日期的年份差</returns>
public static int DiffYear (string start) {
return DiffYear(Convert.ToDateTime(start));
}

/// <summary>
/// 比较日期的年份差
/// </summary>
/// <param name="start">开始日期</param>
/// <param name="end">结束日期</param>
/// <returns>年份差</returns>
public static int DiffYear (string start, string end) {
return DiffYear(Convert.ToDateTime(start), Convert.ToDateTime(end));
}

/// <summary>
/// 比较日期的年份差
/// </summary>
/// <param name="start">开始日期</param>
/// <returns>与当前日期的年份差</returns>
public static int DiffYear (DateTime start) {
return (DiffYear(start, DateTime.Now));
}

/// <summary>
/// 比较两个日期的年份差
/// </summary>
/// <param name="start">开始日期</param>
/// <param name="end">结束日期</param>
/// <returns>年份差</returns>
public static int DiffYear (DateTime start, DateTime end) {
return (end.Year - start.Year);
}

/// <summary>
/// 格式化当天日期(yyyy-MM-dd)
/// </summary>
/// <returns>格式化后的日期字符串</returns>
public static string DateFormat () {
return DateFormat(DateTime.Now);
}

/// <summary>
/// 格式化日期(yyyy-MM-dd)
/// </summary>
/// <param name="date">待格式化的日期</param>
/// <returns>格式化后的日期字符串</returns>
public static string DateFormat (string date) {
return DateFormat(Convert.ToDateTime(date));
}

/// <summary>
/// 格式化日期
/// </summary>
/// <param name="date">待格式化的日期</param>
/// <param name="format">格式化串</param>
/// <returns>格式化后的日期字符串</returns>
public static string DateFormat (string date, string format) {
return DateFormat(Convert.ToDateTime(date), format);
}

/// <summary>
/// 格式化日期(yyyy-MM-dd)
/// </summary>
/// <param name="date">待格式化的日期</param>
/// <returns>格式化后的日期字符串</returns>
public static string DateFormat (DateTime date) {
return DateFormat(date, "yyyy-MM-dd");
}

/// <summary>
/// 格式化日期
/// </summary>
/// <param name="date">待格式化的日期</param>
/// <param name="format">格式化串</param>
/// <returns>格式化后的日期字符串</returns>
public static string DateFormat (DateTime date, string format) {
return date.ToString(format);
}

/// <summary>
/// 格式化日期时间
/// </summary>
/// <param name="datetime">待格式化的日期时间</param>
/// <returns>格式化后的日期时间字符串</returns>
public static string DateTimeFormat (DateTime datetime) {
return DateTimeFormat(datetime, "yyyy-MM-dd HH:mm");
}

/// <summary>
/// 格式化日期时间
/// </summary>
/// <param name="datetime">待格式化的日期时间</param>
/// <param name="format">格式化串</param>
/// <returns>格式化后的日期时间字符串</returns>
public static string DateTimeFormat (DateTime datetime, string format) {
return datetime.ToString(format);
}
}
}