//
// GHNSDate+Parsing.m
//
// Created by Gabe on 3/18/08.
// Copyright 2008 Gabriel Handford
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
//
#import "GHNSDate+Parsing.h"
// Date formatters are not cached since they are not thread-safe. (Thanks Jae!)
// TODO: Investigate synchronized access to cached formatters.
@implementation NSDate (GHParsing)
+ (NSDate *)gh_parseISO8601:(NSString *)dateString {
if (!dateString) return nil;
return [[self gh_iso8601DateFormatter] dateFromString:dateString];
}
+ (NSDate *)gh_parseRFC822:(NSString *)dateString {
if (!dateString) return nil;
return [[self gh_rfc822DateFormatter] dateFromString:dateString];
}
+ (NSDate *)gh_parseHTTP:(NSString *)dateString {
if (!dateString) return nil;
NSDate *parsed = nil;
parsed = [[self gh_rfc1123DateFormatter] dateFromString:dateString];
if (parsed) return parsed;
parsed = [[self gh_rfc850DateFormatter] dateFromString:dateString];
if (parsed) return parsed;
parsed = [[self gh_ascTimeDateFormatter] dateFromString:dateString];
return parsed;
}
+ (NSDate *)gh_parseTimeSinceEpoch:(id)timeSinceEpoch {
return [self gh_parseTimeSinceEpoch:timeSinceEpoch withDefault:timeSinceEpoch];
}
+ (NSDate *)gh_parseTimeSinceEpoch:(id)timeSinceEpoch withDefault:(id)value {
return [self gh_parseTimeSinceEpoch:timeSinceEpoch withDefault:value offsetForTimeZone:nil];
}
+ (NSDate *)gh_parseTimeSinceEpoch:(id)timeSinceEpoch withDefault:(id)value offsetForTimeZone:(NSTimeZone *)timeZone {
if (!timeSinceEpoch) return value;
NSDate *normalDate = [NSDate dateWithTimeIntervalSince1970:[timeSinceEpoch doubleValue]];
if (!timeZone)
return normalDate;
NSTimeZone *localTimeZone = [NSTimeZone localTimeZone];
if ([localTimeZone isEqualToTimeZone:timeZone])
return normalDate;
// The following adapted from http://stackoverflow.com/questions/1081647/how-to-convert-time-to-the-timezone-of-the-iphone-device/1082179#1082179
NSInteger offset = [timeZone secondsFromGMTForDate:normalDate];
NSInteger localOffset = [localTimeZone secondsFromGMTForDate:normalDate];
NSTimeInterval difference = localOffset - offset;
return [[[NSDate alloc] initWithTimeInterval:difference sinceDate:normalDate] autorelease];
}
- (NSString *)gh_formatRFC822 {
return [[[self class] gh_rfc822DateFormatter] stringFromDate:self];
}
- (NSString *)gh_formatHTTP {
return [[[self class] gh_rfc1123DateFormatter] stringFromDate:self];
}
- (NSString *)gh_formatISO8601 {
return [[[self class] gh_iso8601DateFormatter] stringFromDate:self];
}
+ (NSDateFormatter *)gh_rfc822DateFormatter {
NSDateFormatter *gh_rfc822DateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[gh_rfc822DateFormatter setFormatterBehavior:NSDateFormatterBehavior10_4];
// Need to force US locale when generating otherwise it might not be 822 compatible
[gh_rfc822DateFormatter setLocale:[[[NSLocale alloc] initWithLocaleIdentifier:@"en_US"] autorelease]];
[gh_rfc822DateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];
[gh_rfc822DateFormatter setDateFormat:@"EEE, dd MMM yyyy HH:mm:ss ZZZ"];
return gh_rfc822DateFormatter;
}
+ (NSDateFormatter *)gh_iso8601DateFormatter {
// Example: 2007-10-18T16:05:10.000Z
NSDateFormatter *gh_is8601DateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[gh_is8601DateFormatter setFormatterBehavior:NSDateFormatterBehavior10_4];
// Need to force US locale when generating otherwise it might not be 8601 compatible
[gh_is8601DateFormatter setLocale:[[[NSLocale alloc] initWithLocaleIdentifier:@"en_US"] autorelease]];
[gh_is8601DateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];
[gh_is8601DateFormatter setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"];
return gh_is8601DateFormatter;
}
+ (NSDateFormatter *)gh_rfc1123DateFormatter {
// Example: "Wed, 01 Mar 2006 12:00:00 GMT"
NSDateFormatter *gh_rfc1123DateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[gh_rfc1123DateFormatter setFormatterBehavior:NSDateFormatterBehavior10_4];
// Need to force US locale when generating otherwise it might not be 1123 compatible
[gh_rfc1123DateFormatter setLocale:[[[NSLocale alloc] initWithLocaleIdentifier:@"en_US"] autorelease]];
[gh_rfc1123DateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];
[gh_rfc1123DateFormatter setDateFormat:@"EEE, dd MMM yyyy HH:mm:ss zzz"];
return gh_rfc1123DateFormatter;
}
+ (NSDateFormatter *)gh_rfc850DateFormatter {
// Example: Sunday, 06-Nov-94 08:49:37 GMT
NSDateFormatter *gh_rfc850DateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[gh_rfc850DateFormatter setFormatterBehavior:NSDateFormatterBehavior10_4];
[gh_rfc850DateFormatter setLocale:[[[NSLocale alloc] initWithLocaleIdentifier:@"en_US"] autorelease]];
[gh_rfc850DateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];
[gh_rfc850DateFormatter setDateFormat:@"EEEE, dd-MMM-yy HH:mm:ss zzz"];
return gh_rfc850DateFormatter;
}
+ (NSDateFormatter *)gh_ascTimeDateFormatter {
// Example: Sun Nov 6 08:49:37 1994
NSDateFormatter *gh_ascTimeDateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[gh_ascTimeDateFormatter setFormatterBehavior:NSDateFormatterBehavior10_4];
[gh_ascTimeDateFormatter setLocale:[[[NSLocale alloc] initWithLocaleIdentifier:@"en_US"] autorelease]];
[gh_ascTimeDateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];
[gh_ascTimeDateFormatter setDateFormat:@"EEE MMM d HH:mm:ss yyyy"];
return gh_ascTimeDateFormatter;
}
@end
