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first day and last day of the month

Posted on 2014-02-23
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Last Modified: 2014-02-25
hi
if i have 2  values of
v_year year & 
v_m  month ,
in the form
how to get first & last day of given month & year
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Question by:NiceMan331
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7 Comments
 
LVL 35

Expert Comment

by:johnsone
ID: 39880617
Converting to a date, gives you the first day of the month, and using the LAST_DAY function gives you the last day, so something like this:

select to_date(v_m || v_year, 'mmyyyy') first_day_of_month,
last_day(to_date(v_m || v_year, 'mmyyyy')) last_day_of_month
from dual;
0
 

Author Comment

by:NiceMan331
ID: 39881847
strange

i have this funtion

create or replace FUNCTION CURR_m RETURN NUMBER IS  
Y number(2);
BEGIN
    select period_no into Y from period_detail where year= curr_y() and checked = -1;
   RETURN Y;
END;

Open in new window


select curr_m from dual;
it return  1  , correct
but when i use it like this

select to_date(curr_m || curr_y, 'mmyyyy') first_day_of_month,
last_day(to_date(curr_m || curr_y, 'mmyyyy')) last_day_of_month
from dual;

Open in new window


it return
01-12-14   and  31-12-14
instead of :
01-01-14  and 31-01-14
0
 
LVL 35

Accepted Solution

by:
johnsone earned 2000 total points
ID: 39882232
That is because your curr_m is 1 and not 01.  The dates you are getting back are:

December, 01 0014 00:00:00+0000 and December, 31 0014 00:00:00+0000

In a way I would expect that, but I would rather see error that the input doesn't match the supplied format.

Assuming that the 2 variables are numbers and that the year should never be below 1000, then this should work:

SELECT To_date(To_char(curr_m, 'fm00') 
               || curr_y, 'mmyyyy'), 
       Last_day(To_date(To_char(curr_m, 'fm00') 
                        || curr_y, 'mmyyyy')) 
FROM   dual; 

Open in new window

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Author Comment

by:NiceMan331
ID: 39882349
excellent
0
 

Author Comment

by:NiceMan331
ID: 39886304
before i accept your answer , could you please explain to me what is the use of  "fm00" ?
just for knowledge
thanx
0
 

Author Comment

by:NiceMan331
ID: 39886387
ok
thanx
0

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