CODEWITHSUNDEEP
c#.net
cs0815
cs0815

Reputation: 17388

getting closest possible date given NOW and original date in leap year

I would like to determine the closest point in time given now and an original point in time. This works fine as follows: 

var originalPointInTime = new DateTime(2016, 3, 29);
var now = new DateTime(2017, 2, 3);

var closestDay1 = new DateTime
(
now.Year,
originalPointInTime.Month,
originalPointInTime.Day,
originalPointInTime.Hour,
originalPointInTime.Minute,
originalPointInTime.Second,
originalPointInTime.Millisecond
);

However, if I use a leap year point in time it does not:

var leapYearPointInTime = new DateTime(2016, 2, 29);

var closestDay2 = new DateTime
(
    now.Year,
    leapYearPointInTime.Month,
    leapYearPointInTime.Day,
    leapYearPointInTime.Hour,
    leapYearPointInTime.Minute,
    leapYearPointInTime.Second,
    leapYearPointInTime.Millisecond
);

Is there a simple way to get this to work for leap years? I am aware of:

DateTime.IsLeapYear

and could write some convoluted code but maybe there is an easy way to achieve the above?

Upvotes: 0

Views: 74

Answers (2)

Benj
Benj

Reputation: 989

I am not sure I understand your question right. What is the closest point in time. Would it be Feb-28 or Mar-01? I would just do this

DateTime now = DateTime.Now;

var leapYearPointInTime = new DateTime(2016, 2, 29);

if (DateTime.IsLeapYear(leapYearPointInTime.Year))
    if (2 == leapYearPointInTime.Month)
        if (29 == leapYearPointInTime.Day)
            leapYearPointInTime = leapYearPointInTime.Add(new TimeSpan(-1, 0, 0, 0));

var closestDay2 = new DateTime
(
    now.Year,
    leapYearPointInTime.Month,
    leapYearPointInTime.Day,
    leapYearPointInTime.Hour,
    leapYearPointInTime.Minute,
    leapYearPointInTime.Second,
    leapYearPointInTime.Millisecond
);

not sure this counts as 'convoluted' or even counts as the closest point in time, but I hope this helps

Upvotes: 1

Biggles
Biggles

Reputation: 1345

I'm also not sure if I understand correctly, but it seems to me, that you want to get next day (if the given date is bigger, than current) or previous day.

In that case it would be easier to do just:

        DateTime originalPointInTime ;
        DateTime now ;

        var addDay = originalPointInTime  > now  ? 1 :-1;

        now.AddDays(addDay);

Upvotes: 0

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