List of NSDateFormatter format details

Transferred from: http://www.cnblogs.com/xinus/archive/2012/10/29/NSDateFormatter_samples.html

Introduction: NSDateFormatter is a very common class used in iOS development to format NSDate objects and support localized information. Time-related features may also use the Nsdatecomponents class and the Nscalendar class. This article mainly lists common uses of NSDateFormatter.

The NSDate object contains two parts, date, and time. The formatted time string is mainly for the date and time. [Arc is turned on in the code below, so there is no release.] ]

1. Basic usage

1 nsdate* now = [NSDate date];2 nsdateformatter* FMT = [[NSDateFormatter alloc] init];3 Fmt.datestyle = Kcfdateformattersh Ortstyle;4 Fmt.timestyle = kcfdateformattershortstyle;5 Fmt.locale = [[Nslocale alloc] initwithlocaleidentifier:@ "En_ US "];6 nsstring* datestring = [FMT stringfromdate:now];7 NSLog (@"%@ ", datestring);

Print output: 10/29/12, 2:27 PM
This uses the system to provide a formatted string, which is set through fmt.datestyle and fmt.timestyle . The parameters used in the instance are Kcfdateformattershortstyle, plus:

typedef cf_enum (Cfindex, Cfdateformatterstyle) {    //date and time format styles    Kcfdateformatternostyle = 0,       //No output    Kcfdateformattershortstyle = 1,    //10/29/12, 2:27 PM    kcfdateformattermediumstyle = 2,   // Oct, 2:36:59 pm    kcfdateformatterlongstyle = 3,     //October,, 2:38:46 pm gmt+08:00    Kcfdatefo Rmatterfullstyle = 4      //Monday, October, 2:39:56 PM China Standard Time};

2. Customizing the regional language
As in the example above, we are using the regional language is en_US, which refers to American English. If we switch to Simplified Chinese, the code is:

1 Fmt.locale = [[Nslocale alloc] initwithlocaleidentifier:@ "ZH_CN"];

Then the corresponding output is:

typedef cf_enum (Cfindex, Cfdateformatterstyle) {    //date and time format styles    Kcfdateformatternostyle = 0,       //No output    Kcfdateformattershortstyle = 1,    //12-10-29 pm 2:52    kcfdateformattermediumstyle = 2,   // 2012-10-29 pm 2:51:43    kcfdateformatterlongstyle = 3,     //October 29, 2012 gmt+0800 2:51 P.M. 08 Sec.    Kcfdateformatterfullstyle = 4      //October 29, 2012 Monday China standard Time 2:46 P.M. 49 seconds};

World-wide regional language code, see International for Unicode (ICU), http://userguide.icu-project.org/formatparse/ Datetime

3. Custom date and time formats
NSDateFormatter provides a custom date-time method, mainly by setting the property DateFormat, which is commonly set as follows:

1 nsdate* now = [NSDate date];2 nsdateformatter* FMT = [[NSDateFormatter alloc] init];3 fmt.locale = [[Nslocale alloc] Ini twithlocaleidentifier:@ "ZH_CN"];4 Fmt.dateformat = @ "Yyyy-mm-dd ' T ' HH:mm:ss"; 5 nsstring* datestring = [FMT Stringfromdate:now];6 NSLog (@ "%@", datestring);

Print output: 2012-10-29t16:08:40

In addition to the listed above, you can also specify a number of formats, see Http://userguide.icu-project.org/formatparse/datetime.
You can also print out localized string information in conjunction with locale settings.

1 nsdate* now = [NSDate date];2 nsdateformatter* FMT = [[NSDateFormatter alloc] init];3 fmt.locale = [[Nslocale alloc] Ini twithlocaleidentifier:@ "ZH_CN"];4 Fmt.dateformat = @ "Yyyy-mm-dd a HH:mm:ss eeee"; 5 nsstring* datestring = [FMT stringFrom Date:now];6 NSLog (@ "\n%@", datestring);

Print output: 2012-10-29 16:25:27 Mon

4. Custom month week and other characters
NSDateFormatter also provides the appropriate way to modify these characters. In general, use the default character below the corresponding region language to be OK. But you do have the need, and you can do it. The corresponding method is very numerous, as follows:

Managing AM and PM Symbols

• –amsymbol
• –setamsymbol:
• –pmsymbol
• –setpmsymbol:

Managing Weekday Symbols

• –weekdaysymbols
• –setweekdaysymbols:
• –shortweekdaysymbols
• –setshortweekdaysymbols:
• –veryshortweekdaysymbols
• –setveryshortweekdaysymbols:
• –standaloneweekdaysymbols
• –setstandaloneweekdaysymbols:
• –shortstandaloneweekdaysymbols
• –setshortstandaloneweekdaysymbols:
• –veryshortstandaloneweekdaysymbols
• –setveryshortstandaloneweekdaysymbols:

Managing Month Symbols

• –monthsymbols
• –setmonthsymbols:
• –shortmonthsymbols
• –setshortmonthsymbols:
• –veryshortmonthsymbols
• –setveryshortmonthsymbols:
• –standalonemonthsymbols
• –setstandalonemonthsymbols:
• –shortstandalonemonthsymbols
• –setshortstandalonemonthsymbols:
• –veryshortstandalonemonthsymbols
• –setveryshortstandalonemonthsymbols:

Managing Quarter Symbols

• –quartersymbols
• –setquartersymbols:
• –shortquartersymbols
• –setshortquartersymbols:
• –standalonequartersymbols
• –setstandalonequartersymbols:
• –shortstandalonequartersymbols
• –setshortstandalonequartersymbols:

Managing Era Symbols

• –erasymbols
• –seterasymbols:
• –longerasymbols
• –setlongerasymbols:

List of NSDateFormatter format details