python - 如何使用 Pandas 获取两个日期之间的天数

Question

我正在尝试使用以下函数获取两个日期之间的天数

df['date'] = pd.to_datetime(df.date)

# Creating a function that returns the number of days
def calculate_days(date):
    today = pd.Timestamp('today')
    return today - date

# Apply the function to the column date
df['days'] = df['date'].apply(lambda x: calculate_days(x))

结果看起来像这样

153 days 10:16:46.294037

但我想让它说 153 .我该如何处理？

Answer 1

为了性能，您可以在没有 apply 的情况下减去值为了避免循环使用 Series.rsub 从右侧减去:

df['date'] = pd.to_datetime(df.date)
df['days'] = df['date'].rsub(pd.Timestamp('today')).dt.days

工作方式:

df['days'] = (pd.Timestamp('today') - df['date']).dt.days

如果想使用您的解决方案:

df['date'] = pd.to_datetime(df.date)

def calculate_days(date):
    today = pd.Timestamp('today')
    return (today - date).days

df['days'] = df['date'].apply(lambda x: calculate_days(x))

或者:

df['date'] = pd.to_datetime(df.date)

def calculate_days(date):
    today = pd.Timestamp('today')
    return (today - date)

df['days'] = df['date'].apply(lambda x: calculate_days(x)).dt.days