/// <summary>
/// First day of week
/// </summary>
/// <param name="ldt"></param>
/// <returns></returns>
public static LocalDateTime FirstDayOfWeek(this LocalDateTime ldt)
{
var currentCulture = CultureInfo.CurrentCulture;
var firstDayOfWeek = (int)currentCulture.DateTimeFormat.FirstDayOfWeek;
var currentDayOfWeek = (int)ldt.DayOfWeek;
var offset = currentDayOfWeek - firstDayOfWeek < 0 ? 7 : 0;
var numberOfDaysSinceBeginningOfTheWeek = currentDayOfWeek + offset - firstDayOfWeek;
return(ldt.AddDays(-numberOfDaysSinceBeginningOfTheWeek));
}
/// <summary>
/// Previous Year
/// </summary>
/// <param name="ld"></param>
/// <returns></returns>
public static LocalDateTime PreviousYear(this LocalDateTime ld)
{
var year = ld.Year - 1;
var daysOfMonth = DateTime.DaysInMonth(year, ld.Month);
if (daysOfMonth == ld.Day)
{
return(new LocalDateTime(year, ld.Month, ld.Day, ld.Hour, ld.Minute, ld.Second, ld.Millisecond, ld.Calendar));
}
var d = ld.Day - daysOfMonth;
var p = new LocalDateTime(year, ld.Month, daysOfMonth, ld.Hour, ld.Minute, ld.Second, ld.Millisecond, ld.Calendar);
return(p.AddDays(d));
}