CODEWITHSUNDEEP
c#.netdatedatetime
Szabolcs Antal
Szabolcs Antal

Reputation: 957

How to determine if a date it was yesterday, in the last month, in the last year using c#?

I would like to determine if a DateTime was yesterday, if it was in the last month and if it was in the last year.

For example if today is 2013. 10. 21. then 2013. 10. 20. was yesterday, 2013. 09. 23. was in the last month and 2012. 03. 25. was in the last year.

How can i determine these using c#?

Upvotes: 1

Views: 3365

Answers (5)

tia
tia

Reputation: 9698

Straightforward implementation:

public enum DateReference {
    Unknown,
    Yesterday,
    LastMonth,
    LastYear,
}

public static DateReference GetDateReference(DateTime dateTime) {
    var date = dateTime.Date;
    var dateNow = DateTime.Today;

    bool isLastYear = date.Year == dateNow.Year - 1;
    bool isThisYear = date.Year == dateNow.Year;
    bool isLastMonth = date.Month == dateNow.Month - 1;
    bool isThisMonth = date.Month == dateNow.Month;
    bool isLastDay = date.Day == dateNow.Day - 1;

    if (isLastYear)
        return DateReference.LastYear;
    else if (isThisYear && isLastMonth)
        return DateReference.LastMonth;
    else if (isThisYear && isThisMonth && isLastDay)
        return DateReference.Yesterday;

    return DateReference.Unknown;
}

Upvotes: 0

Weyland Yutani
Weyland Yutani

Reputation: 4960

bool IsYesterday(DateTime dt)
{
    DateTime yesterday = DateTime.Today.AddDays(-1);
    if (dt >= yesterday && dt < DateTime.Today)
        return true;
    return false;
}

bool IsInLastMonth(DateTime dt)
{
    DateTime lastMonth = DateTime.Today.AddMonths(-1);
    return dt.Month == lastMonth.Month && dt.Year == lastMonth.Year;
}

bool IsInLastYear(DateTime dt)
{
    return dt.Year == DateTime.Now.Year - 1;
}

Upvotes: 2

Krekkon
Krekkon

Reputation: 1347

// myDate = 2012.02.14 ToDate ... you know 

if (myDate == DateTime.Today.AddDays(-1);)
    Console.WriteLine("Yestoday");

else if (myDate > DateTime.Today.AddMonth(-1) && myDate < DateTime.Today)
   Console.WriteLine("Last month");

// and so on

it needs test and fixes, but it is the way ;)

Upvotes: 3

Mr47
Mr47

Reputation: 2655

I think testing like this could do the trick:

if(new DateTime(DateTime.Now.Year, DateTime.Now.Month, 1).AddMonths(-1) > dateToTestIfLastMonth){

Upvotes: 1

Smeegs
Smeegs

Reputation: 9224

http://msdn.microsoft.com/en-us/library/8ysw4sby.aspx

You can subtract dates then check the timespan object.

Upvotes: 0

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