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between date pandas

df[df.some_date.between(start_date, end_date)]
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pandas diff between dates

df[['A','B']] = df[['A','B']].apply(pd.to_datetime) #if conversion required
df['C'] = (df['B'] - df['A']).dt.days
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pandas difference between dates

# credit to Stack Overflow user in the source link
import pandas as pd 
# df is your pandas dataframe
# if already datetime64 you don't need to use to_datetime

df['A'] = pd.to_datetime(df['A'])
df['B'] = pd.to_datetime(df['B']) 

df['diff'] =  df['A'] - df['B'] # difference in days
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pandas difference between dates in hours

import pandas
df = pandas.DataFrame(columns=['to','fr','ans'])
df.to = [pandas.Timestamp('2014-01-24 13:03:12.050000'), pandas.Timestamp('2014-01-27 11:57:18.240000'), pandas.Timestamp('2014-01-23 10:07:47.660000')]
df.fr = [pandas.Timestamp('2014-01-26 23:41:21.870000'), pandas.Timestamp('2014-01-27 15:38:22.540000'), pandas.Timestamp('2014-01-23 18:50:41.420000')]
(df.fr-df.to).astype('timedelta64[h]')
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