How to round the minute of a datetime object

Question

I have a datetime object produced using strptime     gt  gt  gt  tm datetime datetime 2010  6  10  3  56  23   What I need to do is round the minute to the closest 10th minute  What I have been doing up to this point was taking the minute value and using round   on it  min   round tm minute  -1   However  as with the above example  it gives an invalid time when the minute value is greater than 56  i e   3 60 What is a better way to do this  Does datetime support this

User · Answer

General function to round a datetime at any time lapse in seconds:

def roundTime(dt=None, roundTo=60):
   """Round a datetime object to any time lapse in seconds
   dt : datetime.datetime object, default now.
   roundTo : Closest number of seconds to round to, default 1 minute.
   Author: Thierry Husson 2012 - Use it as you want but don't blame me.
   """
   if dt == None : dt = datetime.datetime.now()
   seconds = (dt.replace(tzinfo=None) - dt.min).seconds
   rounding = (seconds+roundTo/2) // roundTo * roundTo
   return dt + datetime.timedelta(0,rounding-seconds,-dt.microsecond)

Samples with 1 hour rounding & 30 minutes rounding:

print roundTime(datetime.datetime(2012,12,31,23,44,59,1234),roundTo=60*60)
2013-01-01 00:00:00

print roundTime(datetime.datetime(2012,12,31,23,44,59,1234),roundTo=30*60)
2012-12-31 23:30:00

User · Answer

From the best answer I modified to an adapted version using only datetime objects  this avoids having to do the conversion to seconds and makes the calling code more readable   def roundTime dt None  dateDelta datetime timedelta minutes 1           Round a datetime object to a multiple of a timedelta     dt   datetime datetime object  default now      dateDelta   timedelta object  we round to a multiple of this  default 1 minute      Author  Thierry Husson 2012 - Use it as you want but don t blame me              Stijn Nevens 2014 - Changed to use only datetime objects as variables             roundTo   dateDelta total seconds        if dt    None   dt   datetime datetime now       seconds    dt - dt min  seconds          is a floor division  not a comment on following line      rounding    seconds roundTo 2     roundTo   roundTo     return dt   datetime timedelta 0 rounding-seconds -dt microsecond    Samples with 1 hour rounding  amp  15 minutes rounding   print roundTime datetime datetime 2012 12 31 23 44 59  datetime timedelta hour 1   2013-01-01 00 00 00  print roundTime datetime datetime 2012 12 31 23 44 49  datetime timedelta minutes 15   2012-12-31 23 30 00

User · Answer

A two line intuitive solution to round to a given time unit  here seconds  for a datetime object t   format str     Y- m- d  H  M  S  t rounded   datetime strptime datetime strftime t  format str   format str    If you wish to round to a different unit simply alter format str    This approach does not round to arbitrary time amounts as above methods  but is a nicely Pythonic way to round to a given hour  minute or second

User · Answer

Other solution   def round time timestamp None  lapse 0               Round a timestamp to a lapse according to specified minutes      Usage        gt  gt  gt  import datetime  math      gt  gt  gt  round time datetime datetime 2010  6  10  3  56  23   0      datetime datetime 2010  6  10  3  56       gt  gt  gt  round time datetime datetime 2010  6  10  3  56  23   1      datetime datetime 2010  6  10  3  57       gt  gt  gt  round time datetime datetime 2010  6  10  3  56  23   -1      datetime datetime 2010  6  10  3  55       gt  gt  gt  round time datetime datetime 2019  3  11  9  22  11   3      datetime datetime 2019  3  11  9  24       gt  gt  gt  round time datetime datetime 2019  3  11  9  22  11   3 60      datetime datetime 2019  3  11  12  0       gt  gt  gt  round time datetime datetime 2019  3  11  10  0  0   3      datetime datetime 2019  3  11  10  0        param timestamp  Timestamp to round  default  now       param lapse  Lapse to round in minutes  default  0              t   timestamp or datetime datetime now      type  Union datetime  Any      surplus   datetime timedelta seconds t second  microseconds t microsecond      t -  surplus     try          mod   t minute   lapse     except ZeroDivisionError          return t     if mod     minutes   lapse    0         t    datetime timedelta minutes math ceil t minute   lapse    lapse - t minute      elif surplus    datetime timedelta   or lapse  lt  0          t    datetime timedelta minutes  t minute   lapse   1    lapse - t minute      return t   Hope this helps

User · Answer

yes  if your data belongs to a DateTime column in a pandas series  you can round it up using the built-in pandas Series dt round function  See documentation here on pandas Series dt round  In your case of rounding to 10min it will be Series dt round  10min   or Series dt round  600s   like so  pandas Series tm  dt round  10min    Edit to add Example code  import datetime import pandas  tm   datetime datetime 2010  6  10  3  56  23  tm rounded   pandas Series tm  dt round  10min   print tm rounded    gt  gt  gt  0   2010-06-10 04 00 00 dtype  datetime64 ns

User · Answer

Not the best for speed when the exception is caught  however this would work   def  minute10 dt datetime utcnow         try          return dt replace minute round dt minute  -1       except ValueError          return dt replace minute 0    timedelta hours 1    Timings   timeit  minute10 datetime 2016  12  31  23  55   100000 loops  best of 3  5 12   s per loop   timeit  minute10 datetime 2016  12  31  23  31   100000 loops  best of 3  2 21   s per loop

User · Answer

Based on Stijn Nevens and modified for Django use to round current time to the nearest 15 minute   from datetime import date  timedelta  datetime  time      def roundTime dt None  dateDelta timedelta minutes 1             roundTo   dateDelta total seconds            if dt    None   dt   datetime now           seconds    dt - dt min  seconds              is a floor division  not a comment on following line          rounding    seconds roundTo 2     roundTo   roundTo         return dt   timedelta 0 rounding-seconds -dt microsecond       dt   roundTime datetime now   timedelta minutes 15   strftime   H  M  S     dt   11 45 00   if you need full date and time just remove the  strftime   H  M  S

User · Answer

Here is a simpler generalized solution without floating point precision issues and external library dependencies  import datetime  def time mod time  delta  epoch None       if epoch is None          epoch   datetime datetime 1970  1  1  tzinfo time tzinfo      return  time - epoch    delta  def time round time  delta  epoch None       mod   time mod time  delta  epoch      if mod  lt   delta   2          return time - mod     return time    delta - mod   In your case   gt  gt  gt  tm   datetime datetime 2010  6  10  3  56  23   gt  gt  gt  time round tm  datetime timedelta minutes 10   datetime datetime 2010  6  10  4  0

User · Answer

Those seem overly complex  def round down to        num   int datetime utcnow   replace second 0  microsecond 0  minute      return num -  num 10

User · Answer

I used Stijn Nevens code  thank you Stijn  and have a little add-on to share  Rounding up  down and rounding to nearest   update 2019-03-09   comment Spinxz incorporated  thank you   update 2019-12-27   comment Bart incorporated  thank you   Tested for date delta of  X hours  or  X minutes  or  X seconds    import datetime  def round time dt None  date delta datetime timedelta minutes 1   to  average                Round a datetime object to a multiple of a timedelta     dt   datetime datetime object  default now      dateDelta   timedelta object  we round to a multiple of this  default 1 minute      from   http   stackoverflow com questions 3463930 how-to-round-the-minute-of-a-datetime-object-python             round to   date delta total seconds       if dt is None          dt   datetime now       seconds    dt - dt min  seconds      if seconds   round to    0 and dt microsecond    0          rounding    seconds   round to   2     round to   round to     else          if to     up                    is a floor division  not a comment on following line  like in javascript               rounding    seconds   dt microsecond 1000000   round to     round to   round to         elif to     down               rounding   seconds    round to   round to         else              rounding    seconds   round to   2     round to   round to      return dt   datetime timedelta 0  rounding - seconds  - dt microsecond     test data print round time datetime datetime 2019 11 1 14 39 00   date delta datetime timedelta seconds 30   to  up    print round time datetime datetime 2019 11 2 14 39 00 1   date delta datetime timedelta seconds 30   to  up    print round time datetime datetime 2019 11 3 14 39 00 776980   date delta datetime timedelta seconds 30   to  up    print round time datetime datetime 2019 11 4 14 39 29 776980   date delta datetime timedelta seconds 30   to  up    print round time datetime datetime 2018 11 5 14 39 00 776980   date delta datetime timedelta seconds 30   to  down    print round time datetime datetime 2018 11 6 14 38 59 776980   date delta datetime timedelta seconds 30   to  down    print round time datetime datetime 2017 11 7 14 39 15   date delta datetime timedelta seconds 30   to  average    print round time datetime datetime 2017 11 8 14 39 14 999999   date delta datetime timedelta seconds 30   to  average    print round time datetime datetime 2019 11 9 14 39 14 999999   date delta datetime timedelta seconds 30   to  up    print round time datetime datetime 2012 12 10 23 44 59 7769  to  average    print round time datetime datetime 2012 12 11 23 44 59 7769  to  up    print round time datetime datetime 2010 12 12 23 44 59 7769  to  down  date delta datetime timedelta seconds 1    print round time datetime datetime 2011 12 13 23 44 59 7769  to  up  date delta datetime timedelta seconds 1    print round time datetime datetime 2012 12 14 23 44 59  date delta datetime timedelta hours 1  to  down    print round time datetime datetime 2012 12 15 23 44 59  date delta datetime timedelta hours 1  to  up    print round time datetime datetime 2012 12 16 23 44 59  date delta datetime timedelta hours 1    print round time datetime datetime 2012 12 17 23 00 00  date delta datetime timedelta hours 1  to  down    print round time datetime datetime 2012 12 18 23 00 00  date delta datetime timedelta hours 1  to  up    print round time datetime datetime 2012 12 19 23 00 00  date delta datetime timedelta hours 1

User · Answer

i m using this   it has the advantage of working with tz aware datetimes   def round minutes some datetime  datetime  step  int           round up to nearest step-minutes         if step  gt  60          raise AttrbuteError  step must be less than 60        change   timedelta          minutes  some datetime minute   step          seconds some datetime second          microseconds some datetime microsecond            if change  gt  timedelta            change -  timedelta minutes step       return some datetime - change   it has the disadvantage of only working for timeslices less than an hour

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def get rounded datetime self  dt  freq  nearest type  inf         if freq lower       1h           round to   3600     elif freq lower       3h           round to   3   3600     elif freq lower       6h           round to   6   3600     else          raise NotImplementedError  Freq  s is not handled yet    freq            is a floor division  not a comment on following line      seconds from midnight   dt hour   3600   dt minute   60   dt second     if nearest type     inf           rounded sec   int seconds from midnight   round to    round to     elif nearest type     sup           rounded sec    int seconds from midnight   round to    1    round to     else          raise IllegalArgumentException  nearest type should be   inf  or  sup         dt midnight   datetime datetime dt year  dt month  dt day       return dt midnight   datetime timedelta 0  rounded sec

User · Answer

This will get the  floor  of a datetime object stored in tm rounded to the 10 minute mark before tm   tm   tm - datetime timedelta minutes tm minute   10                               seconds tm second                               microseconds tm microsecond    If you want classic rounding to the nearest 10 minute mark  do this   discard   datetime timedelta minutes tm minute   10                               seconds tm second                               microseconds tm microsecond  tm -  discard if discard  gt   datetime timedelta minutes 5       tm    datetime timedelta minutes 10    or this   tm    datetime timedelta minutes 5  tm -  datetime timedelta minutes tm minute   10                           seconds tm second                           microseconds tm microsecond

User · Answer

Pandas has a datetime round feature  but as with most things in Pandas it needs to be in Series format   gt  gt  gt  ts   pd Series pd date range Dt 2019 1 1 1 1  Dt 2019 1 1 1 4  periods 8    gt  gt  gt  print ts  0   2019-01-01 01 01 00 000000000 1   2019-01-01 01 01 25 714285714 2   2019-01-01 01 01 51 428571428 3   2019-01-01 01 02 17 142857142 4   2019-01-01 01 02 42 857142857 5   2019-01-01 01 03 08 571428571 6   2019-01-01 01 03 34 285714285 7   2019-01-01 01 04 00 000000000 dtype  datetime64 ns    gt  gt  gt  ts dt round  1min   0   2019-01-01 01 01 00 1   2019-01-01 01 01 00 2   2019-01-01 01 02 00 3   2019-01-01 01 02 00 4   2019-01-01 01 03 00 5   2019-01-01 01 03 00 6   2019-01-01 01 04 00 7   2019-01-01 01 04 00 dtype  datetime64 ns   Docs - Change the frequency string as needed

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if you don t want to use condition  you can use modulo operator   minutes   int round tm minute  -1     60   UPDATE  did you want something like this   def timeround10 dt       a  b   divmod round dt minute  -1   60      return   i  02i      dt hour   a    24  b   timeround10 datetime datetime 2010  1  1  0  56  0     0 56   - gt  1 00  timeround10 datetime datetime 2010  1  1  23  56  0     23 56   - gt  0 00      if you want result as string  for obtaining datetime result  it s better to use timedelta - see other responses

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The shortest way I know     min   tm minute    10   10

User · Answer

A straightforward approach   def round time dt  round to seconds 60          Round a datetime object to any number of seconds     dt  datetime datetime object     round to seconds  closest number of seconds for rounding  Default 1 minute              rounded epoch   round dt timestamp     round to seconds    round to seconds     rounded dt   datetime datetime fromtimestamp rounded epoch  astimezone dt tzinfo      return rounded dt

[python] How to round the minute of a datetime object

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