c# - How to merge two nullable DateTime objects one contaning time other date I need into one object? -

i've got 2 datetime objects. fetchtime contains time hh:mm:ss insterested in, fetchdate contains date: year, month, day.

example:

debug.writeline("time " + fetchtime); debug.writeline("date " + fetchdate); 

displays example:

time 2014-09-10 23:04:00 date 2014-09-15 00:00:00 

and datetime object looks that:

2014-09-15 23:04:00 

i merge 2 1 or modify 1 of them. thought easy can't see methods datetime object. achievable or first must convert datetime type convert back? finally, have have datetime object because going added sql database .

edit:

i refer nullable datetime: datetime? fetchdate, datetime? fetchtime.

just use datetime constructor

var date = new datetime(fetchdate.year, fetchdate.month, fetchdate.day,      fetchtime.hour, fetchtime.minute, fetchtime.second); 

update: seems using nullable datetime. should underlying datetime value using value property.

var fetchdate = fetchdate.value; var fetchtime =  fetchtime.value; var date = new datetime(fetchdate.year, fetchdate.month, fetchdate.day,      fetchtime.hour, fetchtime.minute, fetchtime.second);