How to truncate the time on a DateTime object in Python

Question

What is a classy way to way truncate a python datetime object    In this particular case  to the day  So basically setting hour  minute  seconds  and microseconds to 0   I would like the output to also be a datetime object  not a string

User · Answer

6 years later    I found this post and I liked more the numpy aproach   import numpy as np dates array   np array   2013-01-01    2013-01-15    2013-01-30    astype  datetime64 ns    truncated dates   dates array astype  datetime64 D      cheers

User · Answer

To get a midnight corresponding to a given datetime object  you could use datetime combine   method    gt  gt  gt  from datetime import datetime  time  gt  gt  gt  dt   datetime utcnow    gt  gt  gt  dt date   datetime date 2015  2  3   gt  gt  gt  datetime combine dt  time min  datetime datetime 2015  2  3  0  0    The advantage compared to the  replace   method is that datetime combine  -based solution will continue to work even if datetime module introduces the nanoseconds support   tzinfo can be preserved if necessary but the utc offset may be different at midnight e g   due to a DST transition and therefore a naive solution  setting tzinfo time attribute  may fail  See How do I get the UTC time of    midnight    for a given timezone

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gt  gt  gt  import datetime  gt  gt  gt  dt   datetime datetime now    gt  gt  gt  datetime datetime date dt  datetime date 2019  4  2

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Use a date not a datetime if you dont care about the time    gt  gt  gt  now   datetime now    gt  gt  gt  now date   datetime date 2011  3  29    You can update a datetime like this    gt  gt  gt  now replace minute 0  hour 0  second 0  microsecond 0  datetime datetime 2011  3  29  0  0

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You can just use datetime date today    It s light and returns exactly what you want

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You can use datetime strftime to extract the day  the month  the year     Example    from datetime import datetime d   datetime today      Retrieves the day and the year print d strftime   d- Y     Output  for today    29-2011   If you just want to retrieve the day  you can use day attribute like    from datetime import datetime d   datetime today      Retrieves the day print d day   Ouput  for today    29

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Here is yet another way which fits in one line but is not particularly elegant   dt   datetime datetime fromordinal datetime date today   toordinal

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See more at https   pandas pydata org pandas-docs stable reference api pandas Series dt floor html  It s now 2019  I think the most efficient way to do it is   df  truncate date     df  timestamp   dt floor  d

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What does truncate mean   You have full control over the formatting by using the strftime   method and using an appropriate format string   http   docs python org library datetime html strftime-strptime-behavior

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If you are dealing with a Series of type DateTime there is a more efficient way to truncate them  specially when the Series object has a lot of rows    You can use the floor function   For example  if you want to truncate it to hours    Generate a range of dates  times   pd Series pd date range start  1 1 2018 04 00 00   end  1 1 2018 22 00 00   freq  s      We can check it comparing the running time between the replace and the floor functions    timeit times apply lambda x   x replace minute 0  second 0  microsecond 0    gt  gt  gt  341 ms    18 2 ms per loop  mean    std  dev  of 7 runs  1 loop each    timeit times dt floor  h    gt  gt  gt  gt 2 26 ms    451   s per loop  mean    std  dev  of 7 runs  100 loops each

User · Answer

There is a module datetime truncate which handlers this for you  It just calls datetime replace

User · Answer

Four years later  another way  avoiding replace  I know the accepted answer from four years ago works  but this seems a tad lighter than using replace   dt   datetime date today   dt   datetime datetime dt year  dt month  dt day    Notes   When you create a datetime object without passing time properties to the constructor  you get midnight  As others have noted  this assumes you want a datetime object for later use with timedeltas   You can  of course  substitute this for the first line  dt   datetime datetime now

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There is a great library used to manipulate dates  Delorean  import datetime from delorean import Delorean now   datetime datetime now   d   Delorean now  timezone  US Pacific     gt  gt  gt  now     datetime datetime 2015  3  26  19  46  40  525703    gt  gt  gt  d truncate  second   Delorean datetime 2015-03-26 19 46 40-07 00  timezone  US Pacific     gt  gt  gt  d truncate  minute   Delorean datetime 2015-03-26 19 46 00-07 00  timezone  US Pacific     gt  gt  gt  d truncate  hour   Delorean datetime 2015-03-26 19 00 00-07 00  timezone  US Pacific     gt  gt  gt  d truncate  day   Delorean datetime 2015-03-26 00 00 00-07 00  timezone  US Pacific     gt  gt  gt  d truncate  month   Delorean datetime 2015-03-01 00 00 00-07 00  timezone  US Pacific     gt  gt  gt  d truncate  year   Delorean datetime 2015-01-01 00 00 00-07 00  timezone  US Pacific     and if you want to get datetime value back    gt  gt  gt  d truncate  year   datetime datetime datetime 2015  1  1  0  0  tzinfo  lt DstTzInfo  US Pacific  PDT-1 day  17 00 00 DST gt

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You could use pandas for that  although it could be overhead for that task   You could use round  floor and ceil like for usual numbers and any pandas frequency from offset-aliases   import pandas as pd import datetime as dt  now   dt datetime now   pd now   pd Timestamp now   freq    1d  pd round   pd now round freq  dt round   pd round to pydatetime    print now  print dt round       2018-06-15 09 33 44 102292 2018-06-15 00 00 00

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I think this is what you re looking for      gt  gt  gt  import datetime  gt  gt  gt  dt   datetime datetime now    gt  gt  gt  dt   dt replace hour 0  minute 0  second 0  microsecond 0    Returns a copy  gt  gt  gt  dt datetime datetime 2011  3  29  0  0    But if you really don t care about the time aspect of things  then you should really only be passing around date objects      gt  gt  gt  d truncated   datetime date dt year  dt month  dt day   gt  gt  gt  d truncated datetime date 2011  3  29

User · Answer

You cannot truncate a datetime object because it is immutable   However  here is one way to construct a new datetime with 0 hour  minute  second  and microsecond fields  without throwing away the original date or tzinfo   newdatetime   now replace hour 0  minute 0  second 0  microsecond 0

[python] How to truncate the time on a DateTime object in Python?

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