如何使用openpyxl正确设置日期格式？

from openpyxl import Workbook
from openpyxl.styles import numbers
from openpyxl.utils import get_column_letter

wb = Workbook()

ws = wb.active

date_format = 'YYYY-MM-DD'  # 自定义日期格式

ws['A1'].number_format = numbers.FORMAT_DATE_XLSX15

ws['A1'] = '2022-01-01'  # 日期值

wb.save('example.xlsx')

from openpyxl import Workbook
from openpyxl.styles import numbers
from openpyxl.utils import get_column_letter

wb = Workbook()
ws = wb.active

date_format = 'YYYY-MM-DD'
ws['A1'].number_format = numbers.FORMAT_DATE_XLSX15
ws['A1'] = '2022-01-01'

wb.save('example.xlsx')