如何从python中的句子中找到非结构化的日期和时间？

import re

def find_dates_and_times(sentence):
    pattern = r'\b(\d{1,2}[-/]\d{1,2}[-/]\d{2,4}|\d{1,2}:\d{2}(:\d{2})?(am|pm)?)\b'
    matches = re.findall(pattern, sentence)
    return matches

sentence = "I will meet you on 2022-12-31 at 10:30am."
dates_and_times = find_dates_and_times(sentence)
print(dates_and_times)

from datetime import datetime

def parse_dates_and_times(matches):
    parsed_dates_and_times = []
    for match in matches:
        try:
            date_time = datetime.strptime(match, '%Y-%m-%d')
            parsed_dates_and_times.append(date_time)
        except ValueError:
            try:
                date_time = datetime.strptime(match, '%m/%d/%Y')
                parsed_dates_and_times.append(date_time)
            except ValueError:
                try:
                    date_time = datetime.strptime(match, '%H:%M%p')
                    parsed_dates_and_times.append(date_time)
                except ValueError:
                    pass
    return parsed_dates_and_times

parsed_dates_and_times = parse_dates_and_times(dates_and_times)
print(parsed_dates_and_times)