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Can any date function solve this problem?

Can any date function solve this problem?

(OP)
Is there anyway make this query shorter?
Vintage(Month of action) is always end date of the action month. I need to define this from Jan 2004 to the most current month.
Is there any fuction can do it automatically?

Many thanks,

/*=========Define Vintage==========*/
when EVNT_PROC_DT between '2005-05-01' and '2005-05-31' then cast('2005-05-31' as date)
when EVNT_PROC_DT between '2005-06-01' and '2005-06-30' then cast('2005-06-30' as date)
when EVNT_PROC_DT between '2005-07-01' and '2005-07-31' then cast('2005-07-31' as date)
when EVNT_PROC_DT between '2005-08-01' and '2005-08-31' then cast('2005-08-31' as date)
when EVNT_PROC_DT between '2005-09-01' and '2005-09-30' then cast('2005-09-30' as date)
when EVNT_PROC_DT between '2005-10-01' and '2005-10-31' then cast('2005-10-31' as date)
when EVNT_PROC_DT between '2005-11-01' and '2005-11-30' then cast('2005-11-30' as date)
else null end as vintage,

RE: Can any date function solve this problem?

To get the date of last day of month, you can try this expression :
add_months(EVNT_PROC_DT + 1 - extract(day from EVNT_PROC_DT), 1) - 1

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