Python的datetime模塊能滿足基本的日期和時間處理需求。 1. 可通過datetime.now()獲取當前日期和時間，也可分別提取.date()和.time()。 2. 能手動創(chuàng)建特定日期時間對象，如datetime(year=2025, month=12, day=25, hour=18, minute=30)。 3. 使用.strftime()按格式輸出字符串，常見代碼包括%Y、%m、%d、%H、%M、%S；用strptime()將字符串解析為datetime對象。 4. 利用timedelta進行日期運算，如加減天數(shù)或小時?？傊?，datetime模塊提供了獲取、創(chuàng)建、格式化及計算日期時間的功能，適用於大多數(shù)基礎(chǔ)場景。

Working with dates and times in Python is straightforward thanks to the built-in datetime module. Whether you're logging events, scheduling tasks, or just displaying time-based information, datetime gives you the tools you need without having to install anything extra.

Getting the Current Date and Time

The most common use of the datetime module is probably fetching the current date and time. You can do that using datetime.now() :

 from datetime import datetime

current_time = datetime.now()
print(current_time)

This will output something like:

 2025-04-05 13:45:30.123456

If you only need the date or the time part separately, you can extract them:

• .date() for just the date
• .time() for just the time

You can also format this output if you want it in a specific string format (more on that later).

Creating Specific Dates and Times

Sometimes you don't want the current time — you might want to represent a specific moment, like an event or a birthday. For that, you can create a datetime object manually:

 from datetime import datetime

event = datetime(year=2025, month=12, day=25, hour=18, minute=30)
print(event)

That would give you:

 2025-12-25 18:30:00

Just make sure the values are valid — for example, months should be between 1–12, and hours follow a 24-hour format unless you handle AM/PM manually.

You can also create date-only objects using date() or time-only using time() , depending on your needs.

Formatting and Parsing Dates

When showing dates to users or reading from logs/files, you often need to convert between strings and datetime objects.

To turn a datetime object into a nicely formatted string, use .strftime() :

 formatted = current_time.strftime("%Y-%m-%d %H:%M")
print(formatted) # eg, "2025-04-05 13:45"

Here are some common formatting codes:

• %Y : 4-digit year
• %m : 2-digit month
• %d : 2-digit day
• %H : hour (24-hour format)
• %M : minute
• %S : second

And if you have a string and want to parse it back into a datetime object, use strptime() :

 date_str = "2025-04-05 13:45"
parsed = datetime.strptime(date_str, "%Y-%m-%d %H:%M")

Mismatched formats will raise errors, so double-check the pattern you're using.

Doing Basic Date Math

Need to calculate how many days until a deadline? Or find out what time it was 3 hours ago?

Use the timedelta class:

 from datetime import datetime, timedelta

now = datetime.now()
tomorrow = now timedelta(days=1)
three_hours_ago = now - timedelta(hours=3)

print("Tomorrow:", tomorrow)
print("Three hours ago:", three_hours_ago)

You can add or subtract timedelta objects to/from datetime objects to move forward or backward in time.

Some things to keep in mind:

• Arithmetic between two datetime objects returns a timedelta
• You can't directly multiply or divide timedelta objects, but you can do basic addition/subtraction

So yes, the datetime module does cover most basic date and time needs in Python. It's not overly fancy, but once you know the core parts — getting current time, creating custom dates, formatting, and doing simple math — you'll find yourself reaching for it often.

基本上就這些。

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