Memeber cannot be synced because TimestampSignup is not set in ISO 8601 format.

[marchrainwu]

In MailChimpManager.cs -> CreateMemberBySubscription, the
TimestampSignup is not set in ISO 8601 format, which causes the member cannot be synced to Mailchimp.
var member = new mailchimp.Member
{
EmailAddress = subscription.Email,
TimestampSignup = subscription.CreatedOnUtc.ToString("s")
};

To fix the issue, I manually format the timestamp with "yyyy-MM-ddTHH:mm:ssZ"

var member = new mailchimp.Member
{
EmailAddress = subscription.Email,
// TimestampSignup = subscription.CreatedOnUtc.ToString("s")
TimestampSignup = subscription.CreatedOnUtc.ToString("yyyy-MM-ddTHH:mm:ssZ")
};

[DmitriyKulagin]

Closed #11

[b1ade68]

I can see an error on each record exported (subscribtions).
http://developer.mailchimp.com/documentation/mailchimp/guides/error-glossary/ - Invalid Resource - Operation createOrUpdate-subscription-139-list-e7cf893d39 - timestamp_signup - This value is not a valid datetime.;

Please note:

1. first time (Mailchimp Audit Empty) I have 217 error on 217 subscribers. 158 Contacts are anyway imported.

2. second time I have 59 errors "timestamp_signup", but imported contacts number still remains 158, e.g. 59 contacts are not imported.

Probabily the timestamp_signup error hides some other error.

Version 4.2

[RomanovM]

The problem seems to still exist. See https://www.nopcommerce.com/boards/topic/90069/mailchimp-plugin-getting-synchronization-errors

[DmitriyKulagin]

Fixed in this commit