Python3时间差计算完全指南 - datetime模块使用教程

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from datetime import datetime, timedelta

# 创建两个datetime对象
start_time = datetime(2023, 5, 10, 9, 30, 0)
end_time = datetime(2023, 5, 12, 15, 45, 30)

# 计算时间差
time_difference = end_time - start_time

print(f"时间差: {time_difference}")
print(f"天数: {time_difference.days}")
print(f"秒数: {time_difference.seconds}")
print(f"总秒数: {time_difference.total_seconds():.2f}")

import time
from datetime import datetime

start = datetime.now()

# 模拟耗时操作
time.sleep(2.5)  # 休眠2.5秒

end = datetime.now()
elapsed = end - start

print(f"程序执行时间: {elapsed.total_seconds():.3f}秒")

now = datetime.now()

# 计算10天后的日期
future_date = now + timedelta(days=10)
print(f"10天后: {future_date.strftime('%Y-%m-%d')}")

# 计算3周前的日期
past_date = now - timedelta(weeks=3)
print(f"3周前: {past_date.strftime('%Y-%m-%d')}")

# 计算精确时间偏移
future_time = now + timedelta(days=2, hours=5, minutes=30)
print(f"2天5小时30分钟后: {future_time.strftime('%Y-%m-%d %H:%M:%S')}")

def format_timedelta(delta):
    total_seconds = int(delta.total_seconds())
    days, remainder = divmod(total_seconds, 86400)
    hours, remainder = divmod(remainder, 3600)
    minutes, seconds = divmod(remainder, 60)
    
    parts = []
    if days: parts.append(f"{days}天")
    if hours: parts.append(f"{hours}小时")
    if minutes: parts.append(f"{minutes}分")
    if seconds or not parts: parts.append(f"{seconds}秒")
    
    return "".join(parts)

# 测试函数
delta1 = timedelta(days=1, hours=5, minutes=42, seconds=15)
delta2 = timedelta(minutes=45, seconds=30)

print(format_timedelta(delta1))  # 输出: 1天5小时42分15秒
print(format_timedelta(delta2))  # 输出: 45分30秒

import time

# 获取当前时间戳
start_timestamp = time.time()

# 执行操作
time.sleep(1.5)  # 休眠1.5秒

# 获取结束时间戳
end_timestamp = time.time()

# 计算时间差（秒）
time_diff = end_timestamp - start_timestamp

print(f"操作耗时: {time_diff:.3f}秒")
print(f"等价于 {time_diff * 1000:.2f} 毫秒")