Higher precision logging module time format?

Question

I am using the logging module from Python and I need to get information about the starting and ending time of different functions calls. For this, I am currently using

formatter = logging.Formatter('%(message)s %(asctime)s.%(msecs)03d %(levelname)s',
                              datefmt='%H:%M:%S')

Since the calls of a particular function do not last more than a few milliseconds, I would like to get a better precision and have more decimal digits. How can I do this?

I nice solution at: Python logging: use milliseconds in time format

If you're looking for a **working example down to nano-second precision**, I have posted one [here](https://stackoverflow.com/a/55612356/1672565). The answer below this question is not really helpful. — s-m-e, Apr 10 '19 at 12:30

score 4 · Accepted Answer · edited Jun 10 '21 at 14:19

4

For showing milliseconds:

logging.Formatter(fmt='%(asctime)s.%(msecs)03d',datefmt='%Y-%m-%d,%H:%M:%S')

An extensive example so you can compare:

def formatTime(self, record, datefmt=None):
    ct = self.converter(record.created)
    if datefmt:
        s = time.strftime(datefmt, ct)
    else:
        t = time.strftime("%Y-%m-%d %H:%M:%S", ct)
        s = "%s,%03d" % (t, record.msecs)
    return s

Check this answer and also this doc to see all the milliseconds you can use:

import time

current_milli_time = lambda: int(round(time.time() * 1000))

Remember, 1000 milliseconds = 1 second, so you will be able to see 3 digits of milliseconds after the last second

edited Jun 10 '21 at 14:19

lospejos

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answered May 22 '17 at 18:08

developer_hatch

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1

But what's the difference with what I am currently using? – wrong_path May 22 '17 at 18:11
I will update the answer so you can compare an extensive example – developer_hatch May 22 '17 at 18:13
now you can call the second if you understand it better – developer_hatch May 22 '17 at 18:15
But I can already see milliseconds, I just want more digits. Does this change it? Thanks. – wrong_path May 22 '17 at 18:19
Updated the anwer again, remember that you only can see 3 digits of milliseconds, and thats because 1000 milliseconds = 1 seconds, so, for example, 12:25:999 is followed by 12:26:000 – developer_hatch May 22 '17 at 18:23
If you found the answer useful, mark it as accepted :) – developer_hatch May 22 '17 at 18:52

Higher precision logging module time format?

1 Answers1