Repeated date without time does not show on 1st of month in summer

If one enters a repeated date for an event, but gives no time, it fails to show up if a repeat falls on the 1st of the month (in summer).

I believe this is due to
(a) the fact that there is no time specified means the system sets the start time to midnight.
(b) GMT encoding of summer time dates means that it is recorded as 23:00 on the day before.
(c) I surmise that when selecting dates for a particular month, the entry for the first is lost because it is recorded as in the previous month.

This is a nuisance if one has chosen not to use the time portion of the field, so that people cannot record an actual start time.

I am using
Calendar 6.x-2.2
Date 6.x-2.4
Views 6.x-2.8
Drupal 6.15
PHP 5.2.11

Regards, Tony.