iOS Development-OC Chapter-nsdate

Today summarizes some of the nsdate in OC simple usage, attention is not NSData Oh!

Use of nsdate

1> NSDate Initialization method

Get current time

NSDate * date = [NSDate date];

Returns the current time base, and then the time after secs seconds

[NSDate datewithtimeintervalsincenow:60 * 60 * 24];

Returns the Lastdate as the benchmark, then secs seconds later

[NSDate datewithtimeinterval:60 * sincedate:lastdate];

The return is based on January 1, 2001, and then secs seconds later.

[NSDate datewithtimeintervalsincereferencedate:0];

The return is based on January 1, 1970, and then secs seconds later.

[NSDate datewithtimeintervalsince1970:60 * 60 * 24];

2> Get time limit method

The time limit of the future 4000

[NSDate Distantfuture];

Past Time limits 00

[NSDate Distantpast];

3> Comparison Time method

Compare two times if they are the same

[Date Isequaltodate:date2];

Returns a date that is relatively late

[Date Laterdate:date2];

Returns the earlier date

[Date Earlierdate:date2];

Returns the Nscomparisonresult object

[Date Compare:date2];

4> Get time interval method

Get a two time interval

[Date2 timeintervalsincedate:date];

Get the time interval between now and 2001

[NSDate timeintervalsincereferencedate];

Get Date1 and 2001 time interval

[Date1 Timeintervalsincereferencedate];

Get date1 and current time interval

Date1.timeintervalsincenow

5> Add time interval

[Date datebyaddingtimeinterval:60 * 60 * 24];

6> display dates based on the current position string

[Date Descriptionwithlocale:[nslocale Currentlocale]];

2. NSDateFormatter formatted Date class

Example:

NSDate * date = [NSDate date];

Initialization

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

Set Date format

Formatter.datestyle = Nsdateformatterfullstyle;

Set the time format

Formatter.timestyle = Nsdateformattershortstyle;

Setting the regional language

Formatter.locale = [Nslocale localewithlocaleidentifier:@ "ZH-CN"];

Convert dates to strings in the format above

NSString * datestring = [formatter stringfromdate:date];

NSLog (@ "%@", datestring);

Custom date format NSDate goto nstring:

NSDate * date = [NSDate date];

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

Set Custom date formats

Formatter.dateformat = @ "Yyyy-mm-dd a hh:mm:ss. SSS E Z ";

NSString * datestring = [formatter stringfromdate:date];

NSLog (@ "%@", datestring);

Custom date format nstring goto nsdate:

NSString * string = @ "2015-12-29 10:18:19";

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

Formatter.dateformat = @ "Yyyy-mm-dd HH:mm:ss";

NSDate * date = [formatter datefromstring:string];

NSLog (@ "%@", date);

Summary DateFormat Format:

YYYY year

MM Month

DD Day

HH 24 hrs

HH 12 hrs

MM min

SS sec

SSS microseconds

A morning afternoon

E-week

Z Time Zone

3. Application of Time Class

1, test the execution time of a piece of code

NSDate * date = [NSDate date];

Put the test code here.

NSLog (@ "%LF", [[NSDate Date] timeintervalsincedate:date]);

2. Unix Timestamp

NSDate turn Timestamp

[[NSDate Date] timeIntervalSince1970];

Time-stamped turn nsdate

[NSDate datewithtimeintervalsince1970:1451394269];

iOS Development-OC Chapter-nsdate