last monday of month

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C#

C#4.0

Hi,
How do I get the last monday of the month please?
Thanks

Posted 5-Jun-12 22:12pm

arkiboys

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3 solutions

Solution 3

The following code can be used to get the LastDayOfMonth

C#

void Main()
{
    DateTime date = LastDayOfMonth(2012, 6, DayOfWeek.Monday);
    
    //date = 6/25/2012
}
    
public DateTime LastDayOfMonth(int year, int month, DayOfWeek dayOfWeek){
    DateTime lastDateOfMonth = new DateTime(year, month,
                                 DateTime.DaysInMonth(year,month));
    return lastDateOfMonth.AddDays(lastDateOfMonth.DayOfWeek < dayOfWeek ? 
    			dayOfWeek - lastDateOfMonth.DayOfWeek -  7 : 
    			dayOfWeek - lastDateOfMonth.DayOfWeek);
}

Posted 6-Jun-12 6:19am

VJ Reddy

Comments

Maciej Los 6-Jun-12 17:50pm

Good work, my 5!

VJ Reddy 6-Jun-12 19:37pm

Thank you, losmac :)

Mehdi Gholam 7-Jun-12 1:35am

5'ed

VJ Reddy 7-Jun-12 2:18am

Thank you, Mehdi :)

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OriginalGriff · Accepted Answer · 2012-06-05T22:21:00

Solution 1

Have a look here: DateTime extensions to make some simple tasks a little more readable[^] - it includes last-x-of month.

Posted 5-Jun-12 22:21pm

OriginalGriff

Comments

Mehdi Gholam 6-Jun-12 4:26am

Just posted the same, 5'ed

VJ Reddy 6-Jun-12 5:19am

Good answer. 5!

VJ Reddy 6-Jun-12 12:14pm

I have gone through the above Tip.

public static DateTime LastOfMonth(this DateTime dt, DayOfWeek dayOfWeek)
method works fine when the sought dayOfWeek enumeration value is less than or equal to the lastDayOfMonth.DayOfWeek enumeration value.

But is not working properly when the sought dayOfWeek enumeration value is more than the lastDayOfMonth.DayOfWeek enumeration value.
eg. DateTime date = new DateTime(2012,7,1);
var lastDay = date.LastOfMonth(DayOfWeek.Wednesday);
returned 7/30/2012 instead of 7/25/2012

I think
AddDays(lastDayOfMonth.DayOfWeek < dayOfWeek ?
dayOfWeek - lastDayOfMonth.DayOfWeek - 7 :
dayOfWeek - lastDayOfMonth.DayOfWeek)

can be used instead of

AddDays(Math.Abs(dayOfWeek - lastDayOfMonth.DayOfWeek) * -1)
in the above method.

Thank you.

OriginalGriff 6-Jun-12 12:43pm

Oops! Sorry for that - fixed, credited and article re-submitted.
IOU 5!

VJ Reddy 6-Jun-12 12:53pm

Thank you very much for the consideration :)

Maciej Los 6-Jun-12 17:49pm

Good answer, my 5!

Mehdi Gholam · Accepted Answer · 2012-06-05T22:24:00

Solution 2

Try this:

C#

public static DateTime LastMonday(int year, int month)
{
    DateTime dt;
    if (month < 12)
        dt = new DateTime(year, month + 1, 1);
    else
        dt = new DateTime(year + 1, 1, 1);
    dt = dt.AddDays(-1);
    while (dt.DayOfWeek != DayOfWeek.Monday) dt = dt.AddDays(-1);
    return dt;
}

Posted 5-Jun-12 22:24pm

Mehdi Gholam

Comments

VJ Reddy 6-Jun-12 5:17am

Good answer. 5!

Mehdi Gholam 6-Jun-12 5:36am

Thanks VJ!

arkiboys 6-Jun-12 9:48am

Thanks

Maciej Los 6-Jun-12 17:50pm

Good answer, my 5!

Mehdi Gholam 7-Jun-12 1:35am

Thanks losmac!