| public static CompareDates ( System.DateTime date1, System.DateTime date2 ) : DateTimeSpan | ||
| date1 | System.DateTime | |
| date2 | System.DateTime | |
| return | DateTimeSpan | |
public static DateTimeSpan CompareDates(DateTime date1, DateTime date2)
{
if (date2 < date1)
{
var sub = date1;
date1 = date2;
date2 = sub;
}
DateTime current = date2;
int years = 0;
int months = 0;
int days = 0;
Phase phase = Phase.Years;
DateTimeSpan span = new DateTimeSpan();
while (phase != Phase.Done)
{
switch (phase)
{
case Phase.Years:
if (current.Year == 1 || current.AddYears(-1) < date1)
{
phase = Phase.Months;
}
else
{
current = current.AddYears(-1);
years++;
}
break;
case Phase.Months:
if (current.AddMonths(-1) < date1)
{
phase = Phase.Days;
}
else
{
current = current.AddMonths(-1);
months++;
}
break;
case Phase.Days:
if (current.AddDays(-1) < date1)
{
var timespan = current - date1;
span = new DateTimeSpan(years, months, days, timespan.Hours, timespan.Minutes, timespan.Seconds, timespan.Milliseconds);
phase = Phase.Done;
}
else
{
current = current.AddDays(-1);
days++;
}
break;
}
}
return span;
}
}