void old_to_new_date(gcstring& s)
{
if (! is_old_date(s))
return ;
const unsigned char* p = (unsigned char*) s.buf() + 1;
DateTime dt = unpack_old_datetime(p);
SuDate sudt(dt.date(), dt.time());
sudt.pack(s.buf());
}
bool is_old_date(const gcstring& s)
{
if (s.size() != 9)
return false;
const unsigned char* p = (const unsigned char*) s.buf();
if (*p != PACK_DATE)
return false;
++p;
if (p[0] == 0 && p[1] < 32)
return false; // new format already
return true;
}