**Input**: strings with date and optional time. Different representations would be nice but necessary. The strings are user-supplied and can be malformed. Examples:

 - `&quot;2004-03-21 12:45:33&quot;` (I consider this the default layout)
 - `&quot;2004/03/21 12:45:33&quot;` (optional layout)
 - `&quot;23.09.2004 04:12:21&quot;` (german format, optional)
 - `&quot;2003-02-11&quot;` (time may be missing)

&lt;/pre&gt;

**Needed Output**: Seconds since Epoch (1970/01/01 00:00:00) or some other fixed point.

**Bonus**: Also, reading the UTC-offset of the local system time would be great.

The input is assumed to be a local time on the machine in question.
The output needs to be UTC. System is Linux only (Debian Lenny and Ubuntu needed).

I have tried to use `boost/date_time`, but must admit I can&#39;t wrap my head around the documentation. The following works without the needed conversion from system local time to UTC:

    std::string date = &quot;2000-01-01&quot;;
    boost::posix_time::ptime ptimedate = boost::posix_time::time_from_string(date);
    ptimedate += boost::posix_time::hours(Hardcoded_UTC_Offset);// where to get from?
    struct tm = boost::posix_time::to_tm(ptimedate);
    int64_t ticks = mktime(&amp;mTmTime);

I think `boost::date_time` can provide the needed UTC offset, but I wouldn&#39;t know how.


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How to parse date/time from string?