When the time-of-day search rolls back past the 1st of the month, dayLimit
(and maxDay) can drop below the first valid day of month. The day-of-month
'*' fast path in TryGetPreviousDay returned actualDay = 0, and
DateTimeToTicks(year, month, 0, ...) underflowed into the last day of the
previous month, which is not re-validated against the month field. Guard
against maxDay below the first day of month so the caller advances to the
previous allowed month instead.
When the time-of-day search rolls back past the 1st of the month, dayLimit
(and maxDay) can drop below the first valid day of month. The day-of-month
'*' fast path in TryGetPreviousDay returned actualDay = 0, and
DateTimeToTicks(year, month, 0, ...) underflowed into the last day of the
previous month, which is not re-validated against the month field. Guard
against maxDay below the first day of month so the caller advances to the
previous allowed month instead.
dualfroz
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