/// <summary>
/// First day of week. <br />
/// 获取一周的第一天。
/// </summary>
/// <param name="ld"></param>
/// <returns></returns>
public static LocalDate FirstDayOfWeek(this LocalDate ld)
{
var currentCulture = CultureInfo.CurrentCulture;
var firstDayOfWeek = (int)currentCulture.DateTimeFormat.FirstDayOfWeek;
var currentDayOfWeek = (int)ld.DayOfWeek;
var offset = currentDayOfWeek - firstDayOfWeek < 0 ? 7 : 0;
var numberOfDaysSinceBeginningOfTheWeek = currentDayOfWeek + offset - firstDayOfWeek;
return(ld.AddDays(-numberOfDaysSinceBeginningOfTheWeek));
}
/// <summary>
/// Previous Year.<br />
/// 上一年。
/// </summary>
/// <param name="ld"></param>
/// <returns></returns>
public static LocalDate PreviousYear(this LocalDate ld)
{
var year = ld.Year - 1;
var daysOfMonth = DateTime.DaysInMonth(year, ld.Month);
if (daysOfMonth == ld.Day)
{
return(new LocalDate(ld.Era, year, ld.Month, ld.Day));
}
var d = ld.Day - daysOfMonth;
var p = new LocalDate(ld.Era, year, ld.Month, daysOfMonth);
return(p.AddDays(d));
}
/// <summary> /// Previous Day.<br /> /// 上一天。 /// </summary> /// <param name="ld"></param> /// <returns></returns> public static LocalDate PreviousDay(this LocalDate ld) => ld.AddDays(-1);
/// <summary> /// Next day.<br /> /// 下一天。 /// </summary> /// <param name="ld"></param> /// <returns></returns> public static LocalDate NextDay(this LocalDate ld) => ld.AddDays(1);