NSDate Some operations (compare, create, add or subtract a certain amount of time on existing date, etc.)

Create Current time

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1. NSDate *date = [NSDate Date];

24 hours from now.

Nstimeinterval a_day = 24*60*60;

NSDate *tomorrow = [NSDate datewithtimeintervalsincenow:a_day];

Create a date based on an existing date

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1. Nstimeinterval a_day = 24*60*60;
2. NSDate *date = [NSDate Date];
3. NSDate *tomorrow = [date addtimeinterval:date];

Date comparison

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1. BOOL isequal = [date Isequaltodate:tomorrow];
2. F (isequal) {
3. NSLog (@"equal");

Get an earlier date

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1. NSDate *earlier_date = [Tomorrow earlierdate:date];
2. NSLog (@"earlierdate =%@", earlierdate);

Later date

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1. NSDate *laterdate = [Tomorrow laterdate:date];
2. NSLog (@"laterdate =%@", laterdate);

Number of seconds between two dates

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1. Nstimeinterval secondsinterval= [Date Timeintervalsincedate:tomorrow];
2. NSLog (@"secondsinterval=%lf", secondsinterval);

To create a date by using the Nscalendar class

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1. Nsdatecomponents *comps = [[Nsdatecomponentsalloc]init];
2. [Comps setmonth:01];
3. [Comps setday:31];
4. [Comps setyear:2013];
5. Nscalendar *calendar = [[Nscalendaralloc]initwithcalendaridentifier:nsgregoriancalendar];
6. NSDate *date = [Calendar Datefromcomponents:comps];

Get a date from an existing date

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2. unsigned units = nsmonthcalendarunit| Nsdaycalendarunit| Nsyearcalendarunit;
4. nsdatecomponents *_comps = [Calendar components:units fromdate:date];
6. Nsinteger month = [_comps month];
8. Nsinteger year = [_comps year];
10. Nsinteger day = [_comps day];
12. NSDateFormatter output of the implementation date
14. NSDateFormatter *formatter = [[Nsdateformatteralloc]init];
16. [Formatter Setdatestyle:nsdateformatterfullstyle]; //Direct output is machine code
18. or manually set the style [formatter setdateformat:@ "YYYY-MM-DD"];
20. NSString *datestring = [Formatter stringfromdate:date];
22. NSLog (@"datestring =%@", datestring);
24. NSLog (@"formater =%@", formatter);

Get date Format Object

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1. -(NSDateFormatter *) Getdateformatter {
2. if (dateformatter = = nil) {
3. Dateformatter = [[NSDateFormatter alloc] init];
4. [Dateformatter Setdatestyle:nsdateformattermediumstyle];
5. [Dateformatter Settimestyle:nsdateformatternostyle];
6. }
7. return dateformatter;
8. }

NSDate Some operations (compare, create, add or subtract a certain amount of time on existing date, etc.)