ios - How to create NSDate like '2013-05-11 00:00:00' -

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this basic question, guess, can't seem find answer in of books.

suppose have date, created this:

nsdate *today = [nsdate date]; 

but want change time part of 'today' '00:00:00'. how can this?

---- added ----

i tried this:

    nsdatecomponents *components = [[nsdatecomponents alloc] init];     [components setday:11];     [components setmonth:5];      [components setyear:2013];     [components sethour:0];     [components setminute:0];     [components setsecond:0];     nscalendar *calendar = [nscalendar currentcalendar];     nsdate *startdate = [calendar datefromcomponents:components];     nslog(@"current date: %@", startdate); 

but nslog prints out this:

current date: 2013-05-11 04:00:00 +0000 

i'm guessing has ny timezone?

-- answer --

here answer looking it. trick eliminate 04:00:00 time set timezone gmt:

[calendar settimezone:[nstimezone timezoneforsecondsfromgmt:0]]; 

-- revised answer --

but might want local time -- example, if need find record in core data date, , stored date in local time -- might not want set timezone gmt, after all.

if want set components of date, want @ nscalendar's methods dealing date components:

nsdate *today = [nsdate date];  // year, month, day date nsdatecomponents *components = [[nscalendar currentcalendar] components:nscalendarunityear | nscalendarunitmonth | nscalendarunitday fromdate:today];  // set hour, minute, second 0 components.hour = 0; components.minute = 0; components.second = 0;  // create date nsdate *date = [[nscalendar currentcalendar] datefromcomponents:components];