OC处理.NetJson时间格式

+ (NSDate *)DateFromDotNetJSONString:(NSString *)string {    static NSRegularExPRession *dateRegEx = nil;    static dispatch_once_t onceToken;    dispatch_once(&onceToken, ^{        dateRegEx = [[NSRegularExpression alloc] initWithPattern:@"^///date//((-?//d++)(?:([+-])(//d{2})(//d{2}))?//)///$" options:NSRegularExpressionCaseInsensitive error:nil];    });    NSTextCheckingResult *regexResult = [dateRegEx firstMatchInString:string options:0 range:NSMakeRange(0, [string length])];        if (regexResult) {        // milliseconds        NSTimeInterval seconds = [[string substringWithRange:[regexResult rangeAtIndex:1]] doubleValue] / 1000.0;        // timezone offset        if ([regexResult rangeAtIndex:2].location != NSNotFound) {            NSString *sign = [string substringWithRange:[regexResult rangeAtIndex:2]];            // hours            seconds += [[NSString stringWithFormat:@"%@%@", sign, [string substringWithRange:[regexResult rangeAtIndex:3]]] doubleValue] * 60.0 * 60.0;            // minutes            seconds += [[NSString stringWithFormat:@"%@%@", sign, [string substringWithRange:[regexResult rangeAtIndex:4]]] doubleValue] * 60.0;        }                return [NSDate dateWithTimeIntervalSince1970:seconds];    }    return nil;}