Python的datetime.timedelta()函数|极客笔记

Python的datetime.timedelta()函数

Python的datetime库中存在着’timedelta()’函数，通常用于计算给定日期之间的差异。我们还可以使用它来操作Python中的日期，这个函数使得用户轻松地操纵日期变得非常容易。

语法

Datetime.timedelta(days = 0, seconds = 0, microseconds = 0, milliseconds = 0, minutes = 0, hours = 0, weeks = 0)
Return: Date

为了更好地理解，我们将在下面的示例中展示如何使用“datetime.timedelta()”函数：

示例1

在这个示例中，我们将打印三年三天后的未来日期：

from datetime import datetime as D_T, timedelta as T_D


# Using current time
initializing_time_for_now = D_T.now()

# To print initial date
print ("Initial Date: ", str(initializing_time_for_now))

# For Calculating the future dates of three years
Future_Date_After_THREE_yrs = initializing_time_for_now + \
                        T_D(days = 1095)
  # For Calculating the future dates of three days
Future_Date_After_THREE_days = initializing_time_for_now + \
                         T_D(days = 2)

# Now, we will print the calculated future dates
print('Future Date after Three years: ', str(Future_Date_After_THREE_yrs))
print('Future Date after Three days: ', str(Future_Date_After_THREE_days))

输出：

Initial Date: 2021-10-14 00:09:43.611036
Future Date after Two years: 2023-10-15 00:09:43.611036
Future Date after Two days: 2021-10-17 00:09:43.611036

示例2

在这个示例中，我们将看到如何打印出两年和两小时前的日期：

from datetime import datetime as D_T, timedelta as T_D

# Using current time
initializing_time_for_now = D_T.now()

# To print initial date
print ("Initial Date:", str(initializing_time_for_now))


# For Calculating the past dates of two year
Past_Date_Before_TWO_yrs = initializing_time_for_now - \
                       timedelta(days = 730)

# For Calculating the past dates of two hours
Past_Date_Before_TWO_hours = initializing_time_for_now - \
                        timedelta(hours = 2)


# Now, we will print the calculated Past Dates
print('Past date before two years: ', str(Past_Date_Before_TWO_yrs))
print('Past date before two hours: ', str(Past_Date_Before_TWO_hours))

输出:

Initial Date: 2021-10-14 00:19:18.449629
Past date before two years: 2019-10-15 00:19:18.449629
Past date before two hours: 2021-10-13 22:19:18.449629

示例3

在这个示例中，我们将计算两个不同日期之间的差异：

from datetime import datetime as D_T, timedelta as T_D


# Using current time
initializing_time_for_now = D_T.now()

# To print initial date
print ("Initial Date:", str(initializing_time_for_now))

# Some another datetime
New_time = initializing_time_for_now + \
                 T_D(days = 7, hours = 6, milliseconds = 55, seconds = 12)

New_time_1 = initializing_time_for_now + \
                 T_D(days = 12, hours = 64, milliseconds = 215, seconds = 90)
# We will print the new time
print ("New calculated time: ", str(New_time))


# Now, we will print the time difference between the two Dates:
print('Time difference between the given dates is:', str(New_time - \
                            initializing_time_for_now))
print('Time difference between the initial Date and New_time_1 is:', str(New_time_1 - \
                            initializing_time_for_now))

输出：

Initial Date: 2021-10-14 00:31:13.920503
New calculated time:  2021-10-21 06:31:25.975503
Time difference between the given dates is: 7 days, 6:00:12.055000
Time difference between the initial Date and New_time_1 is: 14 days, 16:01:30.215000