Convert_stringToDate,DateToString...

-(NSDate *)convertStringToDate:(NSString *) date {

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

//This bellow 3 lines for system date issue

    NSLocale *enUSPOSIXLocale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"];

    assert(enUSPOSIXLocale != nil);

    

    [formatter setLocale:enUSPOSIXLocale];

    [formatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];

        NSDate *nowDate = [[[NSDate alloc] init] autorelease];

        [formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];// set format here which format in string date

        date = [date stringByReplacingOccurrencesOfString:@"+0000" withString:@""];

        nowDate = [formatter dateFromString:date];

        // NSLog(@"date============================>>>>>>>>>>>>>>> : %@", nowDate);

        return nowDate;

}

    NSString *str = @"Tue, 24 May 2011 15:42:01 +0000";

    

    NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];

//This bellow 3 lines for system date issue

    NSLocale *enUSPOSIXLocale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"];

    assert(enUSPOSIXLocale != nil);

    

    [formatter setLocale:enUSPOSIXLocale];

    [dateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];

    [dateFormatter setDateFormat:@"EEE, d MMM yyyy HH:mm:ss z"];

    NSDate *date = [dateFormatter dateFromString: str];

    

    dateFormatter = [[[NSDateFormatter alloc] init] autorelease];

    [dateFormatter setDateFormat:@"dd/MM/yyyy hh:mm:ss a"];

    

    NSString *convertedString = [dateFormatter stringFromDate:date];

    NSLog(@"Converted String : %@",convertedString);

    NSLog(@"Date String Arrived =====>>>%@",strDate);

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

//This bellow 3 lines for system date issue

    NSLocale *enUSPOSIXLocale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"];

    assert(enUSPOSIXLocale != nil);

    

    [dateFormatter setLocale:enUSPOSIXLocale];

    [dateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];

    [dateFormatter setDateFormat:@"dd-MM-yyyy hh:mm:ss a"];

    NSString *dateString = [dateFormatter stringFromDate:[NSDate date]];

    NSLog(dateString);