(Objective-C) Get the Email Received Date/Time

Get's the date/time from the topmost Received header. The date/time of when you received an email may be different than the date/time stored in the Date header field, which if truthful, is the date when the email was sent.

The Received header field will look something like this:

Received: from mail.example.com (mail.example.com [99.255.255.99])
 by inbound-smtp.us-west-2.amazonaws.com with SMTP id 72ma443vs1g0o6vqd8erojkpss35s0dt32h323o1
 for admin@chilkatsoft.com;
 Wed, 25 Jul 2018 08:04:23 +0000 (UTC)

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#import <CkoEmail.h>
#import <CkoStringBuilder.h>
#import <CkoStringTable.h>

CkoEmail *email = [[CkoEmail alloc] init];

BOOL success = [email LoadEml: @"qa_data/eml/p.eml"];
if (success != YES) {
    NSLog(@"%@",email.LastErrorText);
    return;
}

CkoStringBuilder *sb = [[CkoStringBuilder alloc] init];
[sb Append: [email GetHeaderField: @"Received"]];

// Replace semicolons with CRLF's
int numReplaced = [[sb Replace: @";" replacement: @"\r\n"] intValue];

CkoStringTable *st = [[CkoStringTable alloc] init];
[st AppendFromSb: sb];

if ([st.Count intValue] == 0) {
    NSLog(@"%@",@"Should have at least one line..");
    return;
}

// The date/time string is the last line in the string table.
[sb SetString: [st StringAt: [NSNumber numberWithInt: ([st.Count intValue] - 1)]]];
[sb Trim];

NSLog(@"%@%@",@"Received date/time = ",[sb GetAsString]);