You can also just use GetExpVar() for most data.

ExVar is just a struct. most vars are doubles, but time vars will use the t member. Currently defined as:

enum e_ValType
{
    e_Bool,
    e_Double,
    e_Int32,
    e_Int64,     // time
    e_String,
};


struct ExVal
{
    int8_t type;     // e_ValType

    union
    {
        bool b;
        double d;
        int32_t i32;
        int64_t t;            // winrt::clock, 100 nanosecond intervals since Jan 1 1601
        char s[8];
    };
};

Yes, that is how you would do it.