boost::date_time Namespace Reference

Functions
template<class time_type >
time_type	time_from_OADATE (double oa_date)
	Create a time object from an OLE automation date value.

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Function Documentation

template<class time_type >

time_type boost::date_time::time_from_OADATE ( double  oa_date )

inline

Create a time object from an OLE automation date value.

Create a time object from an OLE automation date value. An OLE automation date is implemented as a floating-point number * whose value is the number of days from midnight, 30 December 1899.

Definition at line 51 of file DateTime.hpp.

{
    typedef typename time_type::date_type date_type;
    typedef typename time_type::date_duration_type date_duration_type;
    typedef typename time_type::time_duration_type time_duration_type;
    using boost::math::modf;

    static const date_type base_date(1899, Dec, 30);
    static const time_type base_time(base_date, time_duration_type(0,0,0));

    int dayOffset, hourOffset, minuteOffset, secondOffset;
    double fraction = fabs(modf(oa_date, &dayOffset)) * 24; // fraction = hours
    fraction = modf(fraction, &hourOffset) * 60; // fraction = minutes
    fraction = modf(fraction, &minuteOffset) * 60; // fraction = seconds
    modf(fraction, &secondOffset);
    time_type t(base_time);
    t += time_duration_type(hourOffset, minuteOffset, secondOffset);
    t += date_duration_type(dayOffset);
    return t;
}