/// <summary>
/// 获取最后一天
/// </summary>
/// <returns>当月最后一天日期</returns>
public static DateTime GetMonthLastDay(DateTime date)
{
return date.AddDays(1 - date.Day).AddMonths(1).AddDays(-1);
}标签： DateTime
C# .NET 获取日期是第几周
/// <summary>
/// 获取日期是第几周
/// </summary>
/// <param name="date">日期</param>
/// <returns>第几周</returns>
public static int GetWeekOfYear(DateTime date)
{
//确定此时间在一年中的位置
int dayOfYear = date.DayOfYear;
//当年第一天
DateTime tempDate = new DateTime(date.Year, 1, 1);
//确定当年第一天
int tempDayOfWeek = (int)tempDate.DayOfWeek;
tempDayOfWeek = tempDayOfWeek == 0 ? 7 : tempDayOfWeek;
//确定星期几
int index = (int)date.DayOfWeek;
index = index == 0 ? 7 : index;
//当前周的范围
DateTime retStartDay = date.AddDays(-(index - 1));
DateTime retEndDay = date.AddDays(7 - index);
//确定当前是第几周
int weekOfYear = (int)Math.Ceiling(((double)dayOfYear + tempDayOfWeek - 1) / 7);
if (retStartDay.Year < retEndDay.Year)
{
weekOfYear = 1;
}
return weekOfYear;
}C# .NET DateTime 与 Unix 时间戳互转
DateTime 转 Unix 时间戳
DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));
int unixTimeSpan = (int)(time - startTime).TotalSeconds;Unix 时间戳转 DateTime
DateTime dateTimeStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));
long longTime = long.Parse(timeStamp + "0000000");
TimeSpan toNow = new TimeSpan(longTime);
DateTime dateTime = dateTimeStart.Add(toNow);javascript 实现 date format
比较好用的 js 时间格式化方法，复杂的多种格式。
Date.prototype.format = function (mask) {
var d = this;
var zeroize = function (value, length) {
if (!length) length = 2;
value = String(value);
for (var i = 0, zeros = ''; i < (length - value.length) ; i++) {
zeros += '0';
}
return zeros + value;
};
return mask.replace(/"[^"]*"|'[^']*'|\b(?:d{1,4}|m{1,4}|yy(?:yy)?|([hHMstT])\1?|[lLZ])\b/g, function ($0) {
switch ($0) {
case 'd':
return d.getDate();
case 'dd':
return zeroize(d.getDate());
case 'ddd':
return ['Sun', 'Mon', 'Tue', 'Wed', 'Thr', 'Fri', 'Sat'][d.getDay()];
case 'dddd':
return ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'][d.getDay()];
case 'M':
return d.getMonth() + 1;
case 'MM':
return zeroize(d.getMonth() + 1);
case 'MMM':
return ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'][d.getMonth()];
case 'MMMM':
return ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'][d.getMonth()];
case 'yy':
return String(d.getFullYear()).substr(2);
case 'yyyy':
return d.getFullYear();
case 'h':
return d.getHours() % 12 || 12;
case 'hh':
return zeroize(d.getHours() % 12 || 12);
case 'H':
return d.getHours();
case 'HH':
return zeroize(d.getHours());
case 'm':
return d.getMinutes();
case 'mm':
return zeroize(d.getMinutes());
case 's':
return d.getSeconds();
case 'ss':
return zeroize(d.getSeconds());
case 'l':
return zeroize(d.getMilliseconds(), 3);
case 'L':
var m = d.getMilliseconds();
if (m > 99) m = Math.round(m / 10);
return zeroize(m);
case 'tt':
return d.getHours() < 12 ? 'am' : 'pm';
case 'TT':
return d.getHours() < 12 ? 'AM' : 'PM';
case 'Z':
return d.toUTCString().match(/[A-Z]+$/);
// Return quoted strings with the surrounding quotes removed
default:
return $0.substr(1, $0.length - 2);
}
});
};