agenda: Fixed "Today" and "Yesterday" wrongly displayed for allDay events on some time zones #2857
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The way we were comparing the date for Today and Yesterday was to compute the ISOstring, extract the date and compare that with today's. Such date is however in UTC and allDay events start at midnight, which makes them belong to the previous day on half of the time zones (the same problem could appear on other events earlier than the time zone's offset).
With this PR we compare day and month, which is safer as it should take into consideration also time zones.
Fixes: #2856