from datetime import date, time, datetime, timedelta
# 純日期操作
project_start = date(2024, 2, 1)
current_date = date.today()
print(f"項目已進行{(current_date - project_start).days}天")  # 輸出間隔天數(shù)
# 精準時間控制
meeting_time = time(14, 30, tzinfo=pytz.timezone('Asia/Shanghai'))
print(meeting_time.isoformat())  # 14:30:00+08:00
# 完整日期時間
launch_time = datetime(2024, 12, 31, 23, 59, 59, tzinfo=pytz.utc)
print(launch_time.astimezone(pytz.timezone('America/New_York')))  # 2024-12-31 18:59:59-05:00
# 時間跨度計算
development_cycle = timedelta(weeks=6, days=3)
bug_fix_window = timedelta(hours=72)

import pytz
from dateutil import tz
# 創(chuàng)建時區(qū)aware對象
utc_time = datetime.now(pytz.utc)
local_zone = tz.gettz('Asia/Shanghai')
# 時區(qū)轉換最佳實踐
def convert_timezone(src_time, target_zone):
    if src_time.tzinfo is None:
        raise ValueError("必須使用時區(qū)aware對象")
    return src_time.astimezone(target_zone)
# 處理夏令時敏感日期
paris_tz = pytz.timezone('Europe/Paris')
dt = paris_tz.localize(datetime(2024, 3, 31, 2, 30))  # 自動處理夏令時跳變

def parse_log_timestamp(log_str):
    # 統(tǒng)一處理各種格式的日志時間戳
    formats = [
        '%Y-%m-%dT%H:%M:%S.%fZ',    # ISO UTC格式
        '%d/%b/%Y:%H:%M:%S %z',     # Nginx日志格式
        '%Y%m%d-%H%M%S'             # 自定義壓縮格式
    ]
    for fmt in formats:
        try:
            return datetime.strptime(log_str, fmt).astimezone(pytz.utc)
        except ValueError:
            continue
    raise InvalidTimestampException(f"無法解析的時間格式: {log_str}")

def validate_trade_time(trade_dt):
    # 校驗是否在交易所營業(yè)時間
    nyse_tz = pytz.timezone('America/New_York')
    ny_time = trade_dt.astimezone(nyse_tz)
    # 排除周末
    if ny_time.weekday() >= 5:
        return False
    # 美東時間9:30-16:00
    open_time = ny_time.replace(hour=9, minute=30, second=0)
    close_time = ny_time.replace(hour=16, minute=0, second=0)
    # 處理節(jié)假日（需接入第三方API）
    if ny_time.date() in get_nyse_holidays():
        return False
    return open_time <= ny_time <= close_time

# 錯誤示范
naive_time = datetime.now()  
# 正確做法
aware_time = datetime.now(pytz.timezone('Asia/Tokyo'))

# 獲取毫秒級時間戳
ts_ms = int(datetime.now().timestamp() * 1000)

# 安全創(chuàng)建含夏令時的時間
dt = datetime(2024, 3, 10, 2, 30)
pacific = pytz.timezone('US/Pacific')
localized = pacific.localize(dt, is_dst=None)  # 禁止模糊時間