how to get end date using a start date plus some days

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In my project I have a start date ('regdt'-column name) in a table and number of days in a variable namely 'v_days_eligible'. Now, I want to arrive at expiry date by adding 'regdt+v_days_eligible' and update in the column 'expiry_dt' of the same table.

For current date I used the following code:

string updateSql1 = "UPDATE txfile SET expiry_dt='" + DateTime.Now.AddDays(Convert.ToInt32(v_days_eligible)).ToString("dd/MM/yyyy") + "',payment_recvd_dt=Convert(varchar(10),getdate(),105), pay_status= 'Y' " + "WHERE mem_id= " + v_mem_id + "";

How to do using the column name 'regdt'.

Can any one help me out?

Posted 2-Apr-13 19:03pm

S.Rajendran from Coimbatore

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vijay__p · Answer 1 · 2013-04-02T19:09:00

Solution 1

Hi,

Use DATEADD function

SQL

SELECT DATEADD(day,v_days_eligible,regdt) AS ExpiryDate

Posted 2-Apr-13 19:09pm

vijay__p

Comments

S.Rajendran from Coimbatore 3-Apr-13 1:26am

err: invalid column name 'regdt'

vijay__p 3-Apr-13 1:37am

You have written that you have column regdt in table, if it is there then error should not be there.
try with bwlow query

string updateSql1 = "UPDATE txfile SET expiry_dt=DATEADD(day,"+v_days_eligible+",regdt),payment_recvd_dt=Convert(varchar(10),getdate(),105), pay_status= 'Y' " + "WHERE mem_id= " + v_mem_id + "";