NSDateFormatter date format, nsdateformatter

NSDateFormatter date format, nsdateformatter

Statement of metadata:

G: AD

 

An example of the year:

Yy: two digits behind the year

Yyyy: indicates the complete year.

 

Monthly Statement:

M: The metric is 1 ~ 12, 1 digit or 2 digit

MM: The indicator is displayed as 01 ~ 12. Less than 2 digits will return 0

MMM: specifies the period of the English month, for example, Jan.

MMMM: full display of the English month, for example, January

Daily display:

D: The metric is 1 ~ 3, 1 bits or 2 bits

Dd: Percentage indicates 01 ~ 31. The number of less than two digits is 0.

 

Weekly display:

EEE: English week of the week, such as Sun

EEEE: Complete weekly English statement, for example, Sunday

 

Upper/afternoon display:

Aa: Indicates AM or PM

For example:

H: The percentage is 0 ~ (In 24 hours)

HH: The period is 00 ~ 23, less than 2 digits will return 0 (24 hours)

K: Percentage indicates 0 ~ 12, 1 digit or 2 digit (12 hour)

KK: Percentage indicates 0 ~ 12. Less than 2 digits will return 0 (12 hours)

The score is shown as follows:

M: 0 ~ 59,1 digit or 2 digit

Mm: 00 ~ 59. The number of less than two digits is 0.

Second display:

S: returns 0 ~ 59,1 digit or 2 digit

Ss: 00 ~ 59. The number of less than two digits is 0.

S: Display in milliseconds

An answer on Stackooverflow:

/*    x           number    xx          two digit number    xxx         abbreviated name    xxxx        full name    a           AM/PM    A           millisecond of day    c           day of week (c,cc,ccc,cccc)    d           day of month    e           day of week (e,EEE,EEEE)    F           week of month    g           julian day (since 1/1/4713 BC)    G           era designator (G=GGG,GGGG)    h           hour (1-12, zero padded)    H           hour (0-23, zero padded)    L           month of year (L,LL,LLL,LLLL)    m           minute of hour (0-59, zero padded)    M           month of year (M,MM,MMM,MMMM)    Q           quarter of year (Q,QQ,QQQ,QQQQ)    s           seconds of minute (0-59, zero padded)    S           fraction of second    u           zero padded year    v           general timezone (v=vvv,vvvv)    w           week of year (0-53, zero padded)    y           year (y,yy,yyyy)    z           specific timezone (z=zzz,zzzz)    Z           timezone offset +0000    sql         y-M-d H:m:s    rss         [E, ]d MMM y[y] H:m:s Z|z[zzz]*/

This is my comment for date parsing. I use the following, where toDateUsingFormat uses an NSDateFormatter with the passed in string. I do not use a locale, because rss dates are not localized.

    if ( 0 == [string rangeOfString:@","].length ) {        result = [string toDateUsingFormat:@"d MMM y H:m:s z"];    } else {        result = [string toDateUsingFormat:@"E, d MMM y H:m:s z"];    }

Edit:

I use getObjectValue: instead of dateFromString.

NSDate *result = nil;NSError *error = nil;[dataFormatter getObjectValue:&result forString:dateString errorDescription:&error];

Tips:

1. Set the time format to "MMM dd, yyyy". The "Mar. 24,2015 "(the simulator will not appear), just add this sentence with an extra point.

dateFormatter.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US"];