public static DateInfo OffsetBy(this DateInfo dt, int offsetVal, DateTimeOffsetStyles styles)
{
return(styles switch
{
DateTimeOffsetStyles.Day => DateInfoCalc.OffsetByDays(dt, offsetVal),
DateTimeOffsetStyles.Week => DateInfoCalc.OffsetByWeeks(dt, offsetVal),
DateTimeOffsetStyles.Month => DateInfoCalc.OffsetByMonths(dt, offsetVal, DateTimeOffsetOptions.Relatively),
DateTimeOffsetStyles.Quarters => DateInfoCalc.OffsetByQuarters(dt, offsetVal, DateTimeOffsetOptions.Relatively),
DateTimeOffsetStyles.Year => DateInfoCalc.OffsetByYears(dt, offsetVal, DateTimeOffsetOptions.Relatively),
_ => DateInfoCalc.OffsetByDays(dt, offsetVal)
});
/// <summary>
/// Previous Year
/// </summary>
/// <param name="d"></param>
/// <returns></returns>
public static DateInfo PreviousYear(this DateInfo d)
{
var year = d.Year - 1;
var daysOfMonth = DateTime.DaysInMonth(year, d.Month);
if (daysOfMonth == d.Day)
{
return(new DateInfo(year, d.Month, d.Day));
}
var m = d.Day - daysOfMonth;
var p = new DateInfo(year, d.Month, daysOfMonth);
return(p + m.Days());
}
/// <summary>
/// Create <see cref="DateInfo"/> by special year, month and offset info.<br />
/// 根据指定的年月和偏移信息创建 <see cref="DateInfo"/>
/// </summary>
/// <param name="year"></param>
/// <param name="month"></param>
/// <param name="weekAtMonth"></param>
/// <param name="dayOfWeek"></param>
/// <returns></returns>
public static DateInfo OffsetByWeek(int year, int month, int weekAtMonth, int dayOfWeek)
{
if (weekAtMonth == 0 || weekAtMonth > 5)
{
throw new ArgumentException("weekAtMonth is invalid.", nameof(weekAtMonth));
}
var targetDay = DateTimeCalcHelper.GetTargetDays(year, month, weekAtMonth, dayOfWeek);
if (targetDay > DateInfo.DaysInMonth(year, month))
{
return(DateInfo.InfinitePast);
}
return(DateInfoFactory.Create(year, month, targetDay));
}
/// <summary>
/// Add business days<br />
/// 添加指定个数量的工作日
/// </summary>
/// <param name="d"></param>
/// <param name="days"></param>
/// <returns></returns>
public static DateInfo AddBusinessDays(this DateInfo d, int days)
{
var sign = Math.Sign(days);
var unsignedDays = Math.Abs(days);
for (var i = 0; i < unsignedDays; i++)
{
do
{
d = d.AddDays(sign);
} while (d.DayOfWeek == DayOfWeek.Saturday ||
d.DayOfWeek == DayOfWeek.Sunday);
}
return(d);
}
/// <summary>
/// Add quarters. <br />
/// 添加一个季度。
/// </summary>
/// <param name="dt"></param>
/// <param name="months"></param>
/// <param name="options"></param>
/// <returns></returns>
/// <exception cref="ArgumentNullException"></exception>
public static DateInfo OffsetByMonths(DateInfo dt, int months, DateTimeOffsetOptions options = DateTimeOffsetOptions.Absolute)
{
if (options == DateTimeOffsetOptions.Absolute)
{
return(dt + months.Months());
}
var(year, month) = DateTimeCalcHelper.Calc(dt.Year, dt.Month, months);
var firstDayOfMonth = dt.SetDate(year, month, 1);
var lastDayOfMonth = firstDayOfMonth.LastDayOfMonth().Day;
var day = dt.Day > lastDayOfMonth ? lastDayOfMonth : dt.Day;
return(dt.SetDate(year, month, day));
}
public static bool IsSameYear(this DateInfo d, DateInfo date) => d.Year == date.Year;
public static bool IsSameMonth(this DateInfo d, DateInfo date) => d.Month == date.Month && d.Year == date.Year;
public static bool IsSameDay(this DateInfo d, DateInfo date) => d.DateTimeRef == date.DateTimeRef;
public static DateInfo AddWeeks(this DateInfo d, int weeks) => d.AddDays(weeks * 7);
/// <summary> /// Get last day of this week /// </summary> /// <param name="d"></param> /// <param name="cultureInfo"></param> /// <returns></returns> public static DateInfo GetFirstDayInfoOfWeek(this DateInfo d, CultureInfo cultureInfo) => d.DateTimeRef.GetFirstDayInfoOfWeek(cultureInfo);
public static DateInfo SetDay(this DateInfo d, int day)
{
d.Day = day;
return(d);
}
public static DateInfo SetYear(this DateInfo d, int year)
{
d.Year = year;
return(d);
}
public static bool IsBefore(this DateInfo d, DateInfo toCompareWith) => d < toCompareWith;
/// <summary>
/// Is current date between <paramref name="min"/> and <paramref name="max"/> without boundary.<br />
/// 判断当前日期是否在 min 和 max 之间，开区间。
/// </summary>
/// <param name="d"></param>
/// <param name="min"></param>
/// <param name="max"></param>
/// <returns></returns>
public static bool IsDateBetweenWithoutBoundary(this DateInfo d, DateInfo min, DateInfo max)
{
var dtRef = d.DateTimeRef;
var minRef = min.DateTimeRef;
var maxRef = max.DateTimeRef;
return(dtRef.IsDateBetweenWithoutBoundary(minRef, maxRef));
}
/// <summary> /// Get last day of this week /// </summary> /// <param name="d"></param> /// <returns></returns> public static DateInfo GetLastDayInfoOfWeek(this DateInfo d) => d.GetLastDayInfoOfWeek(null);
/// <summary> /// Gets first day of year /// </summary> /// <param name="d"></param> /// <param name="dayOfWeek"></param> /// <returns></returns> public static DateInfo GetFirstDayInfoOfYear(this DateInfo d, DayOfWeek dayOfWeek) => d.DateTimeRef.GetFirstDayInfoOfYear(dayOfWeek);
/// <summary> /// Gets first day of year /// </summary> /// <param name="d"></param> /// <returns></returns> public static DateInfo GetFirstDayInfoOfYear(this DateInfo d) => new DateInfo(d.Year, 1, 1);
/// <summary> /// Gets first day info of quarter /// </summary> /// <param name="d"></param> /// <returns></returns> public static DateInfo GetFirstDayInfoOfQuarter(this DateInfo d) => d.DateTimeRef.GetFirstDayInfoOfQuarter();
/// <summary> /// Get first day of this month. /// </summary> /// <param name="dt"></param> /// <returns></returns> public static DateInfo GetFirstDayInfoOfMonth(this DateInfo dt) => new DateInfo(dt.Year, dt.Month, 1);
public static DateInfo SetDate(this DateInfo d, int year, int month)
{
d.Year = year;
d.Month = month;
return(d);
}
public static DateInfo AddQuarters(this DateInfo d, int quarters) => d.AddMonths(quarters * 3);
/// <summary>
/// To ago.<br />
/// 转换为 Ago
/// </summary>
/// <param name="d"></param>
/// <returns></returns>
#pragma warning disable 618
public static string ToAgo(this DateInfo d) => (DateTime.Now - d).ToAgo();
public static DateInfo SetMonth(this DateInfo d, int month)
{
d.Month = month;
return(d);
}
public static bool TryParseExact(string s, string[] formats, IFormatProvider provider, DateTimeStyles styles, out DateInfo result)
{
return(DateInfoParse.TryParseExactMultiple(s, formats, DateTimeFormatInfo.GetInstance(provider), styles, out result));
}
public static bool IsAfter(this DateInfo d, DateInfo toCompareWith) => d > toCompareWith;
/// <summary> /// Get last day info of year /// </summary> /// <param name="d"></param> /// <returns></returns> public static DateInfo GetLastDayInfoOfYear(this DateInfo d) => d.DateTimeRef.GetLastDayInfoOfYear();
public static bool TryParse(string s, out DateInfo result)
{
return(DateInfoParse.TryParse(s, DateTimeFormatInfo.CurrentInfo, DateTimeStyles.None, out result));
}
public static bool IsInTheFuture(this DateInfo d) => d > DateTime.Now;
public static bool TryParseExactMultiple(string s, string[] formats, DateTimeFormatInfo formatInfo, DateTimeStyles styles, out DateInfo result)
{
return(TryCreateDateInfo(DateTime.TryParseExact(s, formats, formatInfo, styles, out var time), time, out result));
}
public static bool IsInThePast(this DateInfo d) => d < DateTime.Now;