Ok, I think I have this worked out. It could probably use some cleanup.
UPDATE mrbs_entry
SET start_time = IF(MINUTE(FROM_UNIXTIME(start_time)) > 3, start_time+60, start_time),
end_time = IF(MINUTE(FROM_UNIXTIME(end_time)) > 4, end_time+60, end_time)
WHERE (HOUR(FROM_UNIXTIME(start_time)) = 12 AND HOUR(FROM_UNIXTIME(end_time)) = 12);
UPDATE mrbs_repeat
SET start_time = IF(MINUTE(FROM_UNIXTIME(start_time)) > 3, start_time+60, start_time),
end_time = IF(MINUTE(FROM_UNIXTIME(end_time)) > 4, end_time+60, end_time),
end_date = IF(MINUTE(FROM_UNIXTIME(end_time)) > 4, end_date+60, end_date)
WHERE (HOUR(FROM_UNIXTIME(start_time)) = 12 AND HOUR(FROM_UNIXTIME(end_time)) = 12)
Any way to set a variable and then call it to replace the 3 and 3+1=4?