Python 的datetime.timedelta()函数

Python 的“timedelta()”函数存在于 datetime 库中，通常用于计算给定日期的差异。我们也可以用它在 Python 中操作日期，这个函数让用户操作日期变得非常容易。

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，我们将展示如何使用“datetime.timedelta()”函数下面的例子:

例 1:

在本例中，我们将打印三年零三天的未来日期:

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

例 2:

在本例中，我们将看到如何打印过去两年零两个小时的日期:

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

例 3:

在本例中，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

结论

在本教程中，我们学习了 Python 中 datetime 库的“datetime.timedelta()”函数。我们还讨论了各种示例，以更好地理解操作日期和计算两个日期之间的差异的概念。