Python datetime utcoffset()用法及代碼示例

Python datetime.utcoffset() 方法

datetime.utcoffset() 方法用於 datetime 模塊的 datetime 類。

它使用該類的一個實例並返回一個 timedelta 實例，該實例對應於給定實例中指定的 tzinfo 的 UTC 偏移量。

模塊：

    import datetime

類：

    from datetime import datetime

用法:

    utcoffset()

參數：

• None

返回值：

返回類型是一個 timedelta 對象，表示本地時間和 UTC 時間之間的差異。

utcoffset 的範圍：-timedelta(hours=24) <= offset <= timedelta(hours=24)

如果偏移量在 UTC 以東，那麽它被認為是正的，如果它在 UTC 以西，那麽它就是負的。由於一天有 24 小時，因此 -timedelta(24) 和 timedelta(24) 是可能的最大值。

例：

from datetime import datetime
import pytz

naive= datetime.now()
## Tzinfo is missing from the time object 
## which is naive 
print(naive)
print(naive.tzinfo)
print(naive.utcoffset())
print()

## Adding a timezone
timezone = pytz.timezone("Asia/Kolkata")
aware1 = timezone.localize(naive)
print(aware1)
print(aware1.tzinfo)
print("Time ahead of UTC by:", aware1.utcoffset())
print()

## After adding the timezone info, 
## the object it becomes aware
timezone = pytz.timezone("Asia/Tokyo")
aware2 = timezone.localize(naive)
print(aware2)
print(aware2.tzinfo)
print("Time ahead of UTC by:", aware2.utcoffset())
print()

timezone = pytz.timezone("America/New_York")
aware3 = timezone.localize(naive)
print(aware3)
print(aware3.tzinfo)

## timedelta comes as -1 day 20 hrs 
## which is equal to -4 hrs 
print("Time behind to UTC by:", aware3.utcoffset())
print()

## You can also use the astimezone 
## function of  datetime to 
timezone = pytz.timezone("Europe/Berlin")
aware4 = naive.astimezone(timezone)
print(aware4)
print(aware4.tzinfo)
print("Time ahead of UTC by:", aware4.utcoffset())

輸出

2020-04-30 20:35:51.516509
None
None

2020-04-30 20:35:51.516509+05:30
Asia/Kolkata
Time ahead of UTC by:5:30:00

2020-04-30 20:35:51.516509+09:00
Asia/Tokyo
Time ahead of UTC by:9:00:00

2020-04-30 20:35:51.516509-04:00
America/New_York
Time behind to UTC by:-1 day, 20:00:00

2020-04-30 22:35:51.516509+02:00
Europe/Berlin
Time ahead of UTC by:2:00:00