Python datetime 模块概述及应用场景

from datetime import date
today = date.today()          # 获取当前日期
custom_date = date(2023, 10, 1)  # 创建指定日期
print(today.year, today.month, today.day)  # 输出：2023 10 1

from datetime import time
t = time(14, 30, 15)  # 14:30:15
print(t.hour, t.minute)  # 输出：14 30

from datetime import datetime
now = datetime.now()  # 当前本地时间
utc_now = datetime.utcnow()  # 当前UTC时间
dt = datetime(2023, 10, 1, 9, 30)  # 2023-10-01 09:30:00
# 时间戳转换
timestamp = dt.timestamp()  # 转为Unix时间戳
dt_from_ts = datetime.fromtimestamp(1633068600)

from datetime import datetime, timedelta
now = datetime.now()
future = now + timedelta(days=7, hours=3)  # 7天3小时后
delta = future - now  # 计算时间差
print(delta.days)  # 输出：7

from datetime import datetime, timezone
import pytz
# 本地时间转UTC
local_dt = datetime(2023, 10, 1, 10, 0)
utc_dt = local_dt.astimezone(timezone.utc)
# 使用pytz处理时区
tz_shanghai = pytz.timezone('Asia/Shanghai')
dt_with_tz = tz_shanghai.localize(datetime(2023, 10, 1, 10, 0))

dt = datetime(2023, 10, 1, 14, 30)
formatted = dt.strftime("%Y-%m-%d %H:%M:%S")  # 输出：2023-10-01 14:30:00

date_str = "2023-10-01"
dt = datetime.strptime(date_str, "%Y-%m-%d")  # 解析为datetime对象

end_date = datetime(2023, 12, 31)
days_left = (end_date - datetime.now()).days

log_time = datetime.now().strftime("[%Y-%m-%d %H:%M:%S]")

user_input = "2023-10-01"
try:
    dt = datetime.strptime(user_input, "%Y-%m-%d")
except ValueError:
    print("日期格式错误！")