oc-(Foundation framework-nsdate)

NSDate: is a class that handles DateTime in OC and can be used to represent time

Gets the current time

NSDate *d = [NSDate Date]; To create a date-time object

NSLog output is current time (east eight time zone)

Format the display of time

NSDate *d1 =[NSDate Date]; NSLog (@"%@", D1); //format date, time//NSDateFormatter Date Formatting    /*the YYYY represents a four-bit year mm representing a 2-bit month DD representing a 2-bit day HH representing a 24-hour HH 12-hour mm indicating a 2-bit number of minutes SS representing 2-bit seconds */NSDateFormatter*FOM = [NSDateFormatterNew]; //September 12, 2015Fom.dateformat =@"yyyy mm month DD Day HH:MM:SS"; NSString*datestr =[fom stringfromdate:d1]; NSLog (@"%@", DATESTR);

Calculation time

NSDateFormatter *fom = [NSDateFormatterNew]; //calculate the moment of tomorrow//24 hours after the time//Datewithtimeintervalsincenow is the time from nowFom.dateformat =@"yyyy mm month DD Day HH:MM:SS"; Nstimeinterval T= -* -* -; NSDate*tom =[NSDate datewithtimeintervalsincenow:t]; //format TimeNSString *timestr =[fom Stringfromdate:tom]; NSLog (@"%@", TIMESTR); //calculate yesterday's time-t//nsdate *tom = [NSDate datewithtimeintervalsincenow:-t];

Use of date-time objects

       // Date Object         // 2015-09-12 10:20:30        NSDate *d = [NSDate date];         // Create Date Object        Nscalendar *cal = [Nscalendar Currentcalendar];         // cal components: Get what parts of a date FromDate: Date Object        nsdatecomponents  *coms = [Cal components:nscalendarunityear| nscalendarunitmonth| Nscalendarunitday fromdate:d];        NSLog (@ "%ld%ld%ld", Coms.year, Coms.month, Coms.day);

oc-(Foundation framework-nsdate)