Simple usage of nsdate

NSDate the current time obtained using the date method is 0 time zone

NSDate *date = [NSDate Date];

NSLog (@ "%@", date);

If you want to get the current time zone, you need + 8 hours

NSDate *now = [nsdate datewithtimeintervalsincenow:8 * 60 * 60];

NSLog (@ "%@", now);

Get yesterday at this time

NSDate *yesterday = [nsdate datewithtimeintervalsincenow:8 * 60 * 60-24 * 60 * 60];

NSLog (@ "%@", yesterday);

Get the time tomorrow

NSDate *tomorrow = [[NSDate alloc] Initwithtimeintervalsincenow:8 * 60 * 60 + 24 * 60 *60];

NSLog (@ "%@", Tomorrow);

Get a two-time interval

Timeintervalsincedate: Gets the time interval unit for two time objects: seconds

Nstimeinterval interval = [tomorrow Timeintervalsincedate:yesterday];

NSLog (@ "%.2f", INTERVAL/60/60);

Simulate a simple chat

Receive information

NSLog (@ "Hello!");

Record the time the message was received

NSDate *getmessage = [NSDate Date];

Send Message

1. Input string from keyboard

Char ch[100] = {0};

scanf ("%s", ch);

2. Convert C-language strings to OC strings

NSString *message = [NSString stringwithutf8string:ch];

Record when a message is sent

NSDate *sendmessage = [NSDate Date];

Time interval to get two messages

Nstimeinterval interval1 = [SendMessage timeintervalsincedate:getmessage];

if (interval1< 60) {

NSLog (@ "just..");

}else if (Interval1 > 60&& interval< 60 * 60) {

NSLog (@ "%.f minutes ago", INTERVAL1/60);

}

NSLog (@ "%@", message);

Get current time

NSDate *date1 = [NSDate Date];

NSDateFormatter date format class to control date conversion format '

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

Setting the time zone

[Nstimezone Localtimezone] Get your local time zone

[Formatter Settimezone:[nstimezone Localtimezone];

Set date formatting style

[Formatter Setdatestyle:nsdateformattermediumstyle];

Set the time style

[Formatter Settimestyle: (Nsdateformatterfullstyle)];

Convert NSDate to NSString by creating a date format

NSString *datestr = [Formatter stringfromdate:date1];

NSLog (@ "%@", datestr);

Custom Date format Classes

Format Class object

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

Setting the time zone

[MyFormatter Settimezone:[nstimezone Localtimezone];

Custom Date-time formats

YYYY represents the year mm representing the month DD Representative Day

HH (HH) on behalf of the hour 24-hour system (12-hour system)

Eeee Week

[MyFormatter setdateformat:@ "Yyyy-mm-dd hh:mm:ss eeee oooo"];

Transformation

NSString *datestr1 = [MyFormatter stringfromdate:date];

NSLog (@ "%@", DATESTR1);

Convert a date string to a Date object

Set the date format string must be identical to the date string

@ "January 30, 2015 11:47"

1. Create a Date Format class object

NSDateFormatter *formatter1 = [[NSDateFormatter alloc] init];

2. Set the time zone

[Formatter1 Settimezone:[nstimezone Localtimezone];

Set Date Time format

[Formatter1 setdateformat:@ "yyyy mm month DD day hh:mm"];

4. Conversions

NSDate *date2 = [Formatter datefromstring:@ "January 30, 2015 11:47"];

NSLog (@ "%@", date2);

Converts the string @ "2015013102318" to a NSDate object

1. Create a Date Format class object

NSDateFormatter *formatter2 = [[NSDateFormatter alloc] init];

2. Formatting

[Formatter2 Settimezone:[nstimezone Localtimezone];

[Formatter2 setdateformat:@ "YYYYMMDDHHMMSS"];

3. Conversions

NSDate *date3 = [Formatter datefromstring:@ "20150131023108"];

NSLog (@ "%@", date3);

}

Simple usage of nsdate