text = '10:00, 12:15, 22:30'
remind_time = re.findall('\d{1,2}:\d{,2}', text)
result = []

for i in remind_time:
    i = i.split(':')
    my_time = datetime.time(int(i[0]), int(i[1]))
    delta = datetime.timedelta(hours = 3)
    k =(datetime.datetime.combine(datetime.date(1,1,1),my_time) - delta).time()
    print(k)
    result.append(str(k))
print(result)