public static IEnumerable <DateTime> StepTo(this DateTime from, DateTime to, MonthUnit step)
{
if (step.Months > 0L)
{
var limit = (DateTime.MaxValue - step).AddTicks(1L);
if (limit > to)
{
limit = to;
}
for (; from < limit; from += step)
{
yield return(from);
}
if (from <= to)
{
yield return(from);
}
}
else if (step.Months < 0L)
{
var limit = (DateTime.MinValue - step).AddTicks(-1L);
if (limit < to)
{
limit = to;
}
for (; from > limit; from += step)
{
yield return(from);
}
if (from >= to)
{
yield return(from);
}
}
else
{
throw new ArgumentException("step cannot be zero");
}
}
public static DateTime From(this MonthUnit months, DateTime dateTime)
{
return(dateTime + months);
}
public static DateTime Before(this MonthUnit months, DateTime dateTime)
{
return(dateTime - months);
}
public static DateTime FromNow(this MonthUnit months)
{
return(DateTime.Today + months);
}
public static DateTime Ago(this MonthUnit months)
{
return(DateTime.Today - months);
}