date to unix time conversion

well I have a date format like so: 2006-07-07 (its a std::string)
and I would like to convert this to a unix timestamp, does anyone know how this is done?
and I am not using unix, so if its only a function native to unix then I can not use it.

thanks a lot,
esaptonor

Populate a struct tm with an sscanf, the do a mktime.

Thanks, its working now :)