DateTime parsing problem

[nszabogb]

Problem

Email date/time parsing often fails

local_date_time message::parse_date(const string& date_str) const function returns not_a_date_time whenever the timezone offset is not included in the email time stamp. This is a usual occurrence.

My suggested solution:

local_date_time message::parse_date(const string& date_str) const
{
    try
    {
        string tmp_date_str(date_str);
        if (date_str.find('+') == string::npos)
            tmp_date_str+=" +0000";

        // date format to be parsed is like "Thu, 17 Jul 2014 10:31:49 +0200 (CET)"
        regex r(R"(([A-Za-z]{3}[\ \t]*,)[\ \t]+(\d{1,2}[\ \t]+[A-Za-z]{3}[\ \t]+\d{4})[\ \t]+(\d{2}:\d{2}:\d{2}[\ \t]+(\+|\-)\d{4}).*)");
        smatch m;
        if (regex_match(tmp_date_str, m, r))
        {
...

[karastojko]

According to the RFC 5322 section 3.3, the timezone is mandatory. In case it is neglected, it should be in the non-strict mode. Can you please tell me from which email server or client you are experiencing this case? I do not recall I had it.