两个日期函数之间的差异不起作用 Python

Question

Difference between two date function taken from Python difference between two dates

def days_between(d1, d2):
    d1 = datetime.strptime(d1, "%Y-%m-%d")
    d2 = datetime.strptime(d2, "%Y-%m-%d")
    return abs((d2 - d1).days)

Trying to return a String as strptime() argument 1 must be str, not Series

date1 = list(map(lambda x: datetime.datetime(x,'%Y-%m-%d').strftime('%Y-%m-%d'), df['Date Created']))
date2 = list(map(lambda x: datetime.datetime(x,'%Y-%m-%d').strftime('%Y-%m-%d'), df['Date Completed']))

Result to print into new column of DateFrame

result1 = days_between(date1, date2)

df['Days to Completion'] = result1
print(df.head())

Error given:

Traceback (most recent call last):
  File "C:\Users\ljvw6z\PycharmProjects\AnalysisTest1\dataset.py", line 54, in <module>
    date1 = list(map(lambda x: datetime.datetime(x,'%Y-%m-%d').strftime('%Y-%m-%d'), df['Date Created']))
  File "C:\Users\ljvw6z\PycharmProjects\AnalysisTest1\dataset.py", line 54, in <lambda>
    date1 = list(map(lambda x: datetime.datetime(x,'%Y-%m-%d').strftime('%Y-%m-%d'), df['Date Created']))
TypeError: an integer is required (got type Timestamp)

Answer 1

Based on the error you are getting, the map function requires an integer input instead of the timestamp format, what effectively needs to be done is you converting the datetime to integer first...

You can convert the datetime object to a timetuple, and then use the time.mktime function

import time
from datetime import datetime
timestamp = int(time.mktime(datetime.now().timetuple()))

Then, Convert it back with:

now = datetime.fromtimestamp(timestamp)