Places one record. Returns null when it has no valid start. With no end (no end field, an
empty value, or an end before the start) it sits on its start day. A date-only end is
inclusive; a timestamp end is exclusive, so a meeting ending at midnight stays off the next day.
Places one record. Returns null when it has no valid start. With no end (no end field, an empty value, or an end before the start) it sits on its start day. A date-only end is inclusive; a timestamp end is exclusive, so a meeting ending at midnight stays off the next day.