如何在forms.datetime字段中扩展现有的输入格式？

from wtforms import Form, DateTimeField, validators

class MyForm(Form):
    my_datetime = DateTimeField('My Datetime', format='%Y-%m-%d %H:%M:%S')

    def validate_my_datetime(form, field):
        # 自定义验证器，扩展输入格式
        if field.data is not None and field.data != '':
            try:
                # 在此处添加你希望支持的其他输入格式
                datetime.strptime(field.data, '%Y-%m-%d %H:%M:%S')
                datetime.strptime(field.data, '%Y/%m/%d %H:%M:%S')
            except ValueError:
                raise validators.ValidationError('Invalid datetime format')

# 在视图函数中使用表单
@app.route('/myform', methods=['GET', 'POST'])
def myform():
    form = MyForm(request.form)
    if request.method == 'POST' and form.validate():
        # 处理表单提交
        # ...
    return render_template('myform.html', form=form)