Parsing Date Strings to DateTime Objects

This function is used to parse different date format strings and return the corresponding datetime object.

Technology Stack : datetime, re

Code Type : Function

Code Difficulty : Intermediate

                
                    
import datetime
import re

def parse_date(date_str):
    """
    解析日期字符串，并返回datetime对象。
    """
    date_patterns = [
        (r'\d{4}-\d{2}-\d{2}', '%Y-%m-%d'),  # 年-月-日格式
        (r'\d{2}/\d{2}/\d{4}', '%m/%d/%Y'),  # 月/日/年格式
        (r'\d{2}-\d{2}-\d{2}', '%d-%m-%d'),  # 日-月-日格式
    ]
    
    for pattern, format in date_patterns:
        if re.match(pattern, date_str):
            return datetime.datetime.strptime(date_str, format)
    raise ValueError("No valid date format found for: " + date_str)