Python datetime replace()用法及代码示例

Python datetime.replace() 方法

datetime.replace() 方法用于操作模块 datetime 的 datetime 类的对象。

它用于用相同的值替换日期和时间，除了那些由括号中指定的关键字参数赋予新值的参数。它是一个实例方法，这意味着它适用于类的实例。

模块：

    import datetime

类：

    from datetime import datetime

用法:

    replace(
        year=self.year, 
        month=self.month, 
        day=self.day, 
        hour=self.hour, 
        minute=self.minute, 
        second=self.second, 
        microsecond=self.microsecond, 
        tzinfo=self.tzinfo, 
        * fold=0)

参数：

• year：实例的新年份值(范围：1 <= 年份 <= 9999)
• month：实例的新月份值(范围：1 <= 月份 <= 12)
• day：实例的新日期(范围：1<= 天 <= 31)
• hour:在范围内(24)
• minute:在范围内(60)
• second:在范围内(60)
• microsecond：在范围内(1000000)
• tzinfo:object 作为 tzinfo 参数传递给 datetime 构造函数，或者 None 如果没有传递。
• fold:[0,1]

返回值：

该方法的返回类型是替换参数后的日期时间类对象。

如果值不在给定范围内，则会引发 ValueError。

例：

## Python program explaining the 
## use of datetime class instance methods

from datetime import datetime
import pytz

## Creating an instance
x = datetime(2019, 9, 25,4,54,23)
print("Datetime entered was:", x)
print()

x = datetime.now()
print("Today's date and time:", x)

## Using replace() method 
d = x.replace(year = 2022)
print("New date after changing the year:", d)
print()

d = x.replace(month=1)
print("The date after changing the month:", d)
print()

d = x.replace(day=3)
print("The date after changing the day:", d)
print()

d = x.replace(year=2025, day=30)
print("The date after changing the day and year:", d)
print()

d = x.replace(year= 1999, month =12, day=3)
print("The date after changing the year, month and day:", d)
print()

d = x.replace(hour = 12)
print("The date after changing the hour:",d)
print()

d = x.replace(minute= 4)
print("The date after changing the minute attribute:",d)
print()

d = x.replace(year=2220, month=10, day=28, hour=21, minute =5, second = 20)
print("The date after the changes:",d)
print()

timezone = pytz.timezone("Asia/Kolkata")
d = x.replace(tzinfo=timezone)
print("The date after changing the tzinfo:",d)

输出

Datetime entered was:2019-09-25 04:54:23

Today's date and time:2020-04-30 19:11:10.683769
New date after changing the year:2022-04-30 19:11:10.683769

The date after changing the month:2020-01-30 19:11:10.683769

The date after changing the day:2020-04-03 19:11:10.683769
The date after changing the day and year:2025-04-30 19:11:
10.683769
The date after changing the year, month and day:1999-12-03
 19:11:10.683769

The date after changing the hour:2020-04-30 12:11:10.683769

The date after changing the minute attribute:2020-04-30 19
:04:10.683769

The date after the changes:2220-10-28 21:05:20.683769

The date after changing the tzinfo:2020-04-30 19:11:10.683
769+05:53