Format a datetime into a string with milliseconds

Question

I want to have a datetime string from the date with milliseconds  This code is typical for me and I m eager to learn how to shorten it   from datetime import datetime  timeformatted  str datetime utcnow    semiformatted  timeformatted replace  -      almostformatted  semiformatted replace         formatted almostformatted replace         withspacegoaway formatted replace         formattedstripped withspacegoaway strip   print formattedstripped

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With Python 3 6 you can use   from datetime import datetime datetime utcnow   isoformat sep      timespec  milliseconds     Output    2019-05-10 09 08 53 155    More info here  https   docs python org 3 library datetime html datetime datetime isoformat

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To get a date string with milliseconds  3 decimal places behind seconds   use this   from datetime import datetime  print datetime utcnow   strftime   Y- m- d  H  M  S  f    -3    gt  gt  gt  gt  OUTPUT  gt  gt  gt  gt  2020-05-04 10 18 32 926   Note  For Python3  print requires parentheses   print datetime utcnow   strftime   Y- m- d  H  M  S  f    -3

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import datetime    convert string into date time format   str date    2016-10-06 15 14 54 322989  d date   datetime datetime strptime str date     Y- m- d  H  M  S  f   print d date  print type d date     check d date type      convert date time to regular format   reg format date   d date strftime   d  B  Y  I  M  S  p   print reg format date     some other date formats  reg format date   d date strftime   Y- m- d  I  M  S  p   print reg format date  reg format date   d date strftime   Y- m- d  H  M  S   print reg format date        lt  lt  lt  lt  lt  lt  OUTPUT           2016-10-06 15 14 54 322989      lt class  datetime datetime  gt      06 October 2016 03 14 54 PM     2016-10-06 03 14 54 PM     2016-10-06 15 14 54

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datetime t   datetime datetime now   ms     s  i     t strftime   H  M  S    t microsecond 1000  print ms  14 44 37 134

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I assume you mean you re looking for something that is faster than datetime datetime strftime    and are essentially stripping the non-alpha characters from a utc timestamp   You re approach is marginally faster  and I think you can speed things up even more by slicing the string    gt  gt  gt  import timeit  gt  gt  gt  t timeit Timer  datetime utcnow   strftime   Y m d H M S f            from datetime import datetime      gt  gt  gt  t timeit number 10000000  116 15451288223267   gt  gt  gt  def replaceutc s           return s               replace  -                     replace                        replace                        replace                        strip         gt  gt  gt  t timeit Timer  replaceutc str datetime datetime utcnow              from   main   import replaceutc     import datetime      gt  gt  gt  t timeit number 10000000  77 96774983406067   gt  gt  gt  def sliceutc s           return s  4    s 5 7    s 8 10    s 11 13    s 14 16    s 17 19    s 20         gt  gt  gt  t timeit Timer  sliceutc str datetime utcnow              from   main   import sliceutc     from datetime import datetime      gt  gt  gt  t timeit number 10000000  62 378515005111694

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I dealt with the same problem but in my case it was important that the millisecond was rounded and not truncated  from datetime import datetime  timedelta  def strftime ms datetime obj       y m d H M S   datetime obj timetuple    6      ms   timedelta microseconds   round datetime obj microsecond 1000 0  1000      ms date   datetime y m d H M S    ms     return ms date strftime   Y- m- d  H  M  S  f    -3

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Cabbi raised the issue that on some systems  the microseconds format  f may give  0   so it s not portable to simply chop off the last three characters   The following code carefully formats a timestamp with milliseconds   from datetime import datetime  dt  micro    datetime utcnow   strftime   Y- m- d  H  M  S  f   split      dt     s  03d     dt  int micro    1000  print dt   Example Output   2016-02-26 04 37 53 133   To get the exact output that the OP wanted  we have to strip punctuation characters   from datetime import datetime  dt  micro    datetime utcnow   strftime   Y m d H M S  f   split      dt     s 03d     dt  int micro    1000  print dt   Example Output   20160226043839901

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print datetime utcnow   strftime   Y m d H M S f     http   docs python org library datetime html strftime-strptime-behavior

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from datetime import datetime from time import clock  t   datetime utcnow   print  t     s     s n n     t type t    n   100000  te   clock   for i in xrange 1       t stripped   t strftime   Y m d H M S f   print clock  -te print t stripped   t strftime   Y m d H M S f     print  te   clock   for i in xrange 1       t stripped   str t  replace  -      replace         replace         replace         print clock  -te print t stripped   str t  replace  -      replace         replace         replace           print  te   clock   for i in xrange n       t stripped   str t  translate None   -     print clock  -te print t stripped   str t  translate None   -       print  te   clock   for i in xrange n       s   str t      t stripped   s  4    s 5 7    s 8 10    s 11 13    s 14 16    s 17 19    s 20    print clock  -te print t stripped   s  4    s 5 7    s 8 10    s 11 13    s 14 16    s 17 19    s 20       result  t    2011-09-28 21 31 45 562000     lt type  datetime datetime  gt    3 33410112179 20110928212155046000  t strftime   Y m d H M S f    1 17067364707 20110928212130453000 str t  replace  -      replace         replace         replace          0 658806915404 20110928212130453000 str t  translate None   -      0 645189262881 20110928212130453000 s  4    s 5 7    s 8 10    s 11 13    s 14 16    s 17 19    s 20     Use of translate   and slicing method run in same time translate   presents the advantage to be usable in one line  Comparing the times on the basis of the first one      1 000   t strftime   Y m d H M S f        0 351   str t  replace  -      replace         replace         replace                0 198   str t  translate None   -          0 194   s  4    s 5 7    s 8 10    s 11 13    s 14 16    s 17 19      s 20

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Probably like this    import datetime now   datetime datetime now   now strftime   Y  m  d  H  M  S  f    -3        -3    gt  Removing the 3 last characters as  f is for microsecs

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In python 3 6 and above using python f-strings  from datetime import datetime   i   datetime utcnow    print f quot  quot  quot  i  Y- m- d  H  M  S    quot   03d  quot  format i microsecond    1000   quot  quot  quot     The code specific to format milliseconds is    quot   03d  quot  format i microsecond    1000    The format string   03d  and microsecond to millisecond conversion    1000 is from def  format time in https   github com python cpython blob master Lib datetime py that is used for datetime datetime isoformat

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python -c  from datetime import datetime  print str datetime now     -3   2017-02-09 10 06 37 006

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The problem with datetime utcnow   and other such solutions is that they are slow   More efficient solution may look like this one   def  timestamp prec 0       t   time time       s   time strftime   H  M  S   time localtime t       if prec  gt  0          s        9f     t   1    1 2 prec      return s   Where prec would be 3 in your case  milliseconds    The function works up to 9 decimal places  please note number 9 in the 2nd formatting string    If you d like to round the fractional part  I d suggest building    9f  dynamically with desired number of decimal places

[python] Format a datetime into a string with milliseconds

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