/// <summary>
/// Add quarters. <br />
/// 添加一个季度。
/// </summary>
/// <param name="dt"></param>
/// <param name="quarters"></param>
/// <param name="options"></param>
/// <returns></returns>
/// <exception cref="ArgumentNullException"></exception>
public static DateInfo OffsetByQuarters(DateInfo dt, int quarters, DateTimeOffsetOptions options = DateTimeOffsetOptions.Absolute)
{
if (options == DateTimeOffsetOptions.Absolute)
{
return(dt + quarters.Quarters());
}
return(OffsetByMonths(dt, quarters * 3, DateTimeOffsetOptions.Relatively));
}
/// <summary>
/// Add years. <br />
/// 添加一个季度。
/// </summary>
/// <param name="dt"></param>
/// <param name="years"></param>
/// <param name="options"></param>
/// <returns></returns>
/// <exception cref="ArgumentNullException"></exception>
public static DateInfo OffsetByYears(DateInfo dt, int years, DateTimeOffsetOptions options = DateTimeOffsetOptions.Absolute)
{
if (options == DateTimeOffsetOptions.Absolute)
{
return(dt + years.Years());
}
return(OffsetByMonths(dt, years * 12, DateTimeOffsetOptions.Relatively));
}
/// <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));
}
