Python DateTime - Timedelta 类

Timedelta类用于计算日期之间的差异并表示持续时间。这种差异既可以是正的，也可以是负的。

句法：

class datetime.timedelta(days=0, seconds=0, microseconds=0, milliseconds=0, minutes=0, hours=0, weeks=0)

例子：

Python3

# Timedelta function demonstration
 
from datetime import datetime, timedelta
 
# creating dateime objects
date1 = datetime(2020, 1, 3)
date2 = datetime(2020, 2, 3)
 
# difference between dates
diff = date2 - date1
print("Difference in dates:", diff)
 
# Adding days to date1
date1 += timedelta(days = 4)
print("Date1 after 4 days:", date1)
 
# Sutracting days from date1
date1 -= timedelta(15)
print("Date1 before 15 days:", date1)

输出

Difference in dates: 31 days, 0:00:00
Date1 after 4 days: 2020-01-07 00:00:00
Date1 before 15 days: 2019-12-23 00:00:00

类属性：

让我们看看这个类提供的属性——

Attribute Name	Description
min	minimum value of timedelta object is -999999999
max	maximum value of timedelta object is 999999999
resolution	The minimum possible difference between timedelta objects

示例：获取 timedelta 对象的最小值和最大值

蟒蛇3

from datetime import timedelta
 
# Getting minimum value
Min = timedelta.min
print("Minimum value of timedelta object", Min)
 
# Getting minimum value
Max = timedelta.max
print("Maximum value of timedelta object", Max)

输出

Minimum value of timedelta object -999999999 days, 0:00:00
Maximum value of timedelta object 999999999 days, 23:59:59.999999

输出

Minimum value of timedelta object -999999999 days, 0:00:00

Maximum value of timedelta object 999999999 days, 23:59:59.999999

类函数

Timedelta 类仅提供一个函数，即total_seconds()。此方法返回 timedelta 对象提供的持续时间（以秒为单位）。

注意：对于超过 270 年的持续时间，此方法将精确到微秒。

示例：以秒为单位获取各种持续时间

蟒蛇3

from datetime import timedelta
 
# Getting minimum value
obj = timedelta(hours=1)
print(obj.total_seconds())
 
obj = timedelta(minutes=1)
print(obj.total_seconds())
 
obj = timedelta(days=1)
print(obj.total_seconds())

输出

3600.0
60.0
86400.0

Timedelta 类支持的操作

Operator	Description
Addition (+)	Adds and returns two timedelta objects
Subtraction (-)	Subtracts and returns two timedelta objects
Multiplication (*)	Multiplies timedelta object with float or int
Division (/)	Divides the timedelta object with float or int
Floor division (//)	Divides the timedelta object with float or int and return the int of floor value of the output
Modulo (%)	Divides two timedelta object and returns the remainder
+(timedelta)	Returns the same timedelta object
-(timedelta)	Returns the resultant of -1*timedelta
abs(timedelta)	Returns the +(timedelta) if timedelta.days > 1=0 else returns -(timedelta)
str(timedelta)	Returns a string in the form (+/-) day[s],  HH:MM:SS.UUUUUU
repr(timedelta)	Returns the string representation in the form of the constructor call

示例 1：对 timedelta 对象执行基本算术运算。

蟒蛇3

from datetime import timedelta
 
# creating the timedelta object
t1 = timedelta(days=1)
print("Original timedelta:", t1)
 
# multiplication
t2 = t1*5.5
print("After Multiplication:", t2)
 
# Subtraction
res = t2 - t1
print("After Subtraction:", res)
 
# addition
res += t2
print("After Addition:", res)
 
# division
res = t2/2.5
print("After division:", res)
 
# floor division
res = t2 //2
print("After floor division:", res)
 
# Modulo
res = t2%timedelta(days=3)
print("After Modulo:", res)

输出

Original timedelta: 1 day, 0:00:00
After Multiplication: 5 days, 12:00:00
After Subtraction: 4 days, 12:00:00
After Addition: 10 days, 0:00:00
After division: 2 days, 4:48:00
After floor division: 2 days, 18:00:00
After Modulo: 2 days, 12:00:00

示例 2：获取绝对值和 timedelta 对象的字符串表示

蟒蛇3

from datetime import timedelta
 
# creating the timedelta object
t1 = timedelta(days=1)
print("Original timedelta:", t1)
 
# Negatiob of timedelta object
t1 = -(t1)
print("After Negation:", t1)
 
# Getting Absolute value
t1 = abs(t1)
print("Absolute Value:", t1)
 
# Getting string representation
print("String representation:", str(t1))
 
# Getting Constructor call
print("Constructor call:", repr(t1))

输出

Original timedelta: 1 day, 0:00:00
After Negation: -1 day, 0:00:00
Absolute Value: 1 day, 0:00:00
String representation: 1 day, 0:00:00
Constructor call: datetime.timedelta(1)

注意：有关Python日期时间的更多信息，请参阅Python日期时间教程