from datetime import datetime
获取当前完整时间
now = datetime.now()
print(now)  # 输出：2025-04-05 14:30:25.123456
只获取当前日期
today = datetime.today()
print(today.date())  # 输出：2025-04-05

from datetime import datetime
将datetime转为字符串
now = datetime.now()
formatted = now.strftime("%Y年%m月%d日 %H:%M")
print(formatted)  # 输出：2025年04月05日 14:30
将字符串转为datetime对象
date_str = "2025-03-20 09:15"
parsed = datetime.strptime(date_str, "%Y-%m-%d %H:%M")
print(parsed)  # 输出：2025-03-20 09:15:00

from datetime import datetime, timedelta
当前时间
now = datetime.now()
3天后的时间
future = now + timedelta(days=3)
print(future)
1小时前的时间
past = now - timedelta(hours=1)
print(past)
计算两个时间的差
start = datetime(2025, 3, 1)
end = datetime(2025, 3, 10)
diff = end - start
print(diff.days)  # 输出：9

from datetime import datetime
from zoneinfo import ZoneInfo
设置不同时区的时间
beijing_time = datetime.now(ZoneInfo("Asia/Shanghai"))
newyork_time = datetime.now(ZoneInfo("America/New_York"))
print("北京：", beijing_time)
print("纽约：", newyork_time)