NSDate and NSDateFormatter Use tips

1. Show Current Time

　　NSDate *date = [nsdate date]; gets the current time

NSDateFormatter *formatter = [[NSDateFormatter alloc]init];

[Formatter setdateformat:@ "Yyyy-mm-dd a HH:mm:ss eeee"];

NSLog (@ "date =%@", [formatter stringfromdate:date]);

//output result is date = 2015-10-09 pm 20:34:05 Friday

　　 // Get the time of yesterday

nsdate *dateofyesterday = [nsdate datewithtimeinterval:- *3600 sincedate:d ate];

NSLog(@ "yesterday =%@", [Formatter stringfromdate:d ateofyesterday]);

// output yesterday = 2015-10-08 pm 20:55:28 Thursday

//2. Displays the number of seconds in the common time format

nsdate *dates = [nsdate dateWithTimeIntervalSince1970:+];

nsdateformatter *formatters = [[nsdateformatter alloc]init ];

　　 [formatters setdateformat:@ "Mm:ss"];

NSLog(@ "100s =%@", [formatters stringfromdate:d ates]);

// output is 100s = 01:40

3. customizing the regional language

Formatter. Locale = [nslocale localewithlocaleidentifier:@ "en_US"];//Celestial is ZH_CN

NSLog(@ "data =%@", [Formatter stringfromdate:d ate]);

// output data = 2015-10-09 PM 20:43:11 Friday

4. convert string to bit nsdate type

nsstring *datestring = @ "2015-07-16 am 11:52:49";

[Formatter settimezone: [nstimezone systemtimezone]];

[Formatter setdateformat:@ "Yyyy-m-dd aHH:mm:ss"];

nsdate *datefromstring =[formatter datefromstring:d atestring];

NSDate and NSDateFormatter Use tips