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In an array of dates how to find closest previous date from a given date?

Tony Di Angelo

For example I have an array of 1000 dates for example 1-feb-2010,15-jan-1997,10-feb-2001,17-feb-2010 and so on....If date given is for exampl 15-feb-2010 I need to find closest previous date from given date. In this case correct answer should be 1-feb-2010. How to find this date? Thanx for help

1 Reply

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Sebastian16y ago
One way would be:

public DateTime? FindClosestDate(IEnumerable source, DateTime target)
{
    DateTime? result = null;
    var lowestDifference = TimeSpan.MaxValue;

    foreach (var date in source)
    {
        if (date >= target)
            continue;

        var difference = target - date;

        if (difference < lowestDifference)
        {
            lowestDifference = difference;
            result = date;
        }
    }

    return result;
}
+1