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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,31 @@ | ||
| // | ||
| // NSDate+InternetDateTime.h | ||
| // MWFeedParser | ||
| // | ||
| // Created by Michael Waterfall on 07/10/2010. | ||
| // Copyright 2010 Michael Waterfall. All rights reserved. | ||
| // | ||
|
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| #import <Foundation/Foundation.h> | ||
|
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||
| // Formatting hints | ||
| typedef enum { | ||
| DateFormatHintNone, | ||
| DateFormatHintRFC822, | ||
| DateFormatHintRFC3339 | ||
| } DateFormatHint; | ||
|
|
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| // A category to parse internet date & time strings | ||
| @interface NSDate (InternetDateTime) | ||
|
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| // Get date from RFC3339 or RFC822 string | ||
| // - A format/specification hint can be used to speed up, | ||
| // otherwise both will be attempted in order to get a date | ||
| + (NSDate *)dateFromInternetDateTimeString:(NSString *)dateString | ||
| formatHint:(DateFormatHint)hint; | ||
|
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| // Get date from a string using a specific date specification | ||
| + (NSDate *)dateFromRFC3339String:(NSString *)dateString; | ||
| + (NSDate *)dateFromRFC822String:(NSString *)dateString; | ||
|
|
||
| @end |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,142 @@ | ||
| // | ||
| // NSDate+InternetDateTime.m | ||
| // MWFeedParser | ||
| // | ||
| // Created by Michael Waterfall on 07/10/2010. | ||
| // Copyright 2010 Michael Waterfall. All rights reserved. | ||
| // | ||
|
|
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| #import "NSDate+InternetDateTime.h" | ||
|
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||
| // Always keep the formatter around as they're expensive to instantiate | ||
| static NSDateFormatter *_internetDateTimeFormatter = nil; | ||
|
|
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| // Good info on internet dates here: | ||
| // http://developer.apple.com/iphone/library/qa/qa2010/qa1480.html | ||
| @implementation NSDate (InternetDateTime) | ||
|
|
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| // Instantiate single date formatter | ||
| + (NSDateFormatter *)internetDateTimeFormatter { | ||
| @synchronized(self) { | ||
| if (!_internetDateTimeFormatter) { | ||
| NSLocale *en_US_POSIX = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"]; | ||
| _internetDateTimeFormatter = [[NSDateFormatter alloc] init]; | ||
| [_internetDateTimeFormatter setLocale:en_US_POSIX]; | ||
| [_internetDateTimeFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]]; | ||
| } | ||
| } | ||
| return _internetDateTimeFormatter; | ||
| } | ||
|
|
||
| // Get a date from a string - hint can be used to speed up | ||
| + (NSDate *)dateFromInternetDateTimeString:(NSString *)dateString formatHint:(DateFormatHint)hint { | ||
| // Keep dateString around a while (for thread-safety) | ||
| NSDate *date = nil; | ||
| if (dateString) { | ||
| if (hint != DateFormatHintRFC3339) { | ||
| // Try RFC822 first | ||
| date = [NSDate dateFromRFC822String:dateString]; | ||
| if (!date) date = [NSDate dateFromRFC3339String:dateString]; | ||
| } else { | ||
| // Try RFC3339 first | ||
| date = [NSDate dateFromRFC3339String:dateString]; | ||
| if (!date) date = [NSDate dateFromRFC822String:dateString]; | ||
| } | ||
| } | ||
| // Finished with date string | ||
| return date; | ||
| } | ||
|
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||
| // See http://www.faqs.org/rfcs/rfc822.html | ||
| + (NSDate *)dateFromRFC822String:(NSString *)dateString { | ||
| // Keep dateString around a while (for thread-safety) | ||
| NSDate *date = nil; | ||
| if (dateString) { | ||
| NSDateFormatter *dateFormatter = [NSDate internetDateTimeFormatter]; | ||
| @synchronized(dateFormatter) { | ||
|
|
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| // Process | ||
| NSString *RFC822String = [[NSString stringWithString:dateString] uppercaseString]; | ||
| if ([RFC822String rangeOfString:@","].location != NSNotFound) { | ||
| if (!date) { // Sun, 19 May 2002 15:21:36 GMT | ||
| [dateFormatter setDateFormat:@"EEE, d MMM yyyy HH:mm:ss zzz"]; | ||
| date = [dateFormatter dateFromString:RFC822String]; | ||
| } | ||
| if (!date) { // Sun, 19 May 2002 15:21 GMT | ||
| [dateFormatter setDateFormat:@"EEE, d MMM yyyy HH:mm zzz"]; | ||
| date = [dateFormatter dateFromString:RFC822String]; | ||
| } | ||
| if (!date) { // Sun, 19 May 2002 15:21:36 | ||
| [dateFormatter setDateFormat:@"EEE, d MMM yyyy HH:mm:ss"]; | ||
| date = [dateFormatter dateFromString:RFC822String]; | ||
| } | ||
| if (!date) { // Sun, 19 May 2002 15:21 | ||
| [dateFormatter setDateFormat:@"EEE, d MMM yyyy HH:mm"]; | ||
| date = [dateFormatter dateFromString:RFC822String]; | ||
| } | ||
| } else { | ||
| if (!date) { // 19 May 2002 15:21:36 GMT | ||
| [dateFormatter setDateFormat:@"d MMM yyyy HH:mm:ss zzz"]; | ||
| date = [dateFormatter dateFromString:RFC822String]; | ||
| } | ||
| if (!date) { // 19 May 2002 15:21 GMT | ||
| [dateFormatter setDateFormat:@"d MMM yyyy HH:mm zzz"]; | ||
| date = [dateFormatter dateFromString:RFC822String]; | ||
| } | ||
| if (!date) { // 19 May 2002 15:21:36 | ||
| [dateFormatter setDateFormat:@"d MMM yyyy HH:mm:ss"]; | ||
| date = [dateFormatter dateFromString:RFC822String]; | ||
| } | ||
| if (!date) { // 19 May 2002 15:21 | ||
| [dateFormatter setDateFormat:@"d MMM yyyy HH:mm"]; | ||
| date = [dateFormatter dateFromString:RFC822String]; | ||
| } | ||
| } | ||
| if (!date) NSLog(@"Could not parse RFC822 date: \"%@\" Possible invalid format.", dateString); | ||
|
|
||
| } | ||
| } | ||
| // Finished with date string | ||
| return date; | ||
| } | ||
|
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| // See http://www.faqs.org/rfcs/rfc3339.html | ||
| + (NSDate *)dateFromRFC3339String:(NSString *)dateString { | ||
| // Keep dateString around a while (for thread-safety) | ||
| NSDate *date = nil; | ||
| if (dateString) { | ||
| NSDateFormatter *dateFormatter = [NSDate internetDateTimeFormatter]; | ||
| @synchronized(dateFormatter) { | ||
|
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| // Process date | ||
| NSString *RFC3339String = [[NSString stringWithString:dateString] uppercaseString]; | ||
| RFC3339String = [RFC3339String stringByReplacingOccurrencesOfString:@"Z" withString:@"-0000"]; | ||
| // Remove colon in timezone as it breaks NSDateFormatter in iOS 4+. | ||
| // - see https://devforums.apple.com/thread/45837 | ||
| if (RFC3339String.length > 20) { | ||
| RFC3339String = [RFC3339String stringByReplacingOccurrencesOfString:@":" | ||
| withString:@"" | ||
| options:0 | ||
| range:NSMakeRange(20, RFC3339String.length-20)]; | ||
| } | ||
| if (!date) { // 1996-12-19T16:39:57-0800 | ||
| [dateFormatter setDateFormat:@"yyyy'-'MM'-'dd'T'HH':'mm':'ssZZZ"]; | ||
| date = [dateFormatter dateFromString:RFC3339String]; | ||
| } | ||
| if (!date) { // 1937-01-01T12:00:27.87+0020 | ||
| [dateFormatter setDateFormat:@"yyyy'-'MM'-'dd'T'HH':'mm':'ss.SSSZZZ"]; | ||
| date = [dateFormatter dateFromString:RFC3339String]; | ||
| } | ||
| if (!date) { // 1937-01-01T12:00:27 | ||
| [dateFormatter setDateFormat:@"yyyy'-'MM'-'dd'T'HH':'mm':'ss"]; | ||
| date = [dateFormatter dateFromString:RFC3339String]; | ||
| } | ||
| if (!date) NSLog(@"Could not parse RFC3339 date: \"%@\" Possible invalid format.", dateString); | ||
|
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| } | ||
| } | ||
| // Finished with date string | ||
| return date; | ||
| } | ||
|
|
||
| @end |
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