Python datetime.timedelta()用法及代码示例

Python timedelta()函数存在于datetime库中，该函数通常用于计算日期差，也可以用于Python中的日期操作。这是执行日期操作的最简单方法之一。

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

返回值：日期

代码1：

# Timedelta function demonstration  
  
from datetime import datetime, timedelta 
  
  
# Using current time 
ini_time_for_now = datetime.now() 
  
# printing initial_date 
print ("initial_date", str(ini_time_for_now)) 
  
# Calculating future dates 
# for two years 
future_date_after_2yrs = ini_time_for_now + \ 
                        timedelta(days = 730) 
  
future_date_after_2days = ini_time_for_now + \ 
                         timedelta(days = 2) 
  
# printing calculated future_dates 
print('future_date_after_2yrs:', str(future_date_after_2yrs)) 
print('future_date_after_2days:', str(future_date_after_2days))

输出：

initial_date 2019-02-27 12:41:45.018389
future_date_after_2yrs:2021-02-26 12:41:45.018389
future_date_after_2days:2019-03-01 12:41:45.018389

代码2：

# Timedelta function demonstration  
from datetime import datetime, timedelta 
  
  
# Using current time 
ini_time_for_now = datetime.now() 
  
# printing initial_date 
print ("initial_date", str(ini_time_for_now)) 
  
# Calculating past dates 
# for two years 
past_date_before_2yrs = ini_time_for_now - \ 
                       timedelta(days = 730) 
  
# for two hours 
past_date_before_2hours = ini_time_for_now - \ 
                        timedelta(hours = 2) 
  
  
# printing calculated past_dates 
print('past_date_before_2yrs:', str(past_date_before_2yrs)) 
print('past_date_after_2days:', str(past_date_before_2hours))

输出：

initial_date 2019-02-27 12:41:46.104662
past_date_before_2yrs:2017-02-27 12:41:46.104662
past_date_after_2days:2019-02-27 10:41:46.104662

代码3：

# Timedelta function demonstration  
from datetime import datetime, timedelta 
  
# Using current time 
ini_time_for_now = datetime.now() 
  
# printing initial_date 
print ("initial_date", str(ini_time_for_now)) 
  
# Some another datetime 
new_final_time = ini_time_for_now + \ 
                 timedelta(days = 2) 
  
# printing new final_date 
print ("new_final_time", str(new_final_time)) 
  
  
# printing calculated past_dates 
print('Time difference:', str(new_final_time - \ 
                             ini_time_for_now))

输出：

initial_date 2019-02-27 12:41:47.386595
new_final_time 2019-03-01 12:41:47.386595
Time difference:2 days, 0:00:00

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注：本文由纯净天空筛选整理自garg_ak0109大神的英文原创作品 Python | datetime.timedelta() function。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。