assign a variable to JodaTime

Consider I have a value which i have to set as day in JodaTime. 

int new_day;

this is my day which I have to set as day in JodaTime. I already have a time in JodaTime object which is 2014-04-01T10:10:10.000+05:30. i want to set the date 01 to 15 and consider value of new_day = 15;. I want this 15 instead of 01 and the answer should be coming like this after changing. 2014-04-15T10:10:10.000+05:30. This is what i tried and not working

start=start.plusDays(new_day);

Thanks

Jon Skeet
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quotationmark

If your start variable is of time DateTime, I suspect you want DateTime.withDayOfMonth:

start = start.withDayOfMonth(new_day);

Other types (e.g. LocalDateTime) have similar methods.

(I'd also advise you to start following Java naming conventions, using camelCasing instead of underscore_separation.)

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