Python: convert datetime format to another

Question

So i have this kind f format:

'%Y-%m-%d %H:%M:%S.%f'

date_time = datetime.now()

Ouput

'2019-04-15 07:52:14.211697'

And i want to change is into this format: '%Y-%m-%d %H:%M:%S,%f'

This is what i have try:

time = datetime.strptime(str(date_time), '%Y-%m-%d %H:%M:%S,%f')

And this is the error:

ValueError: time data '2019-04-15 07:52:14.211697' does not match format '%Y-%m-%d %H:%M:%S,%f'

Edit

So i have this string:

    maches = regex.findall(
        '[0-9]{4}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[1-2][0-9]|3[0-1]) (?:2[0-3]|[01][0-9]):[0-5][0-9]:[0-5][0-9],[0-9][0-9][0-9]',
        line)

match[0] = '2019-03-13 17:35:35,855'

And i want to convert it to Datetime:

time = datetime.strptime(maches[0], '%Y-%m-%d %H:%M:%S,%f')

And this returned another format:

2019-03-13 17:35:35.855000

Why ?

Community · Accepted Answer · 2020-06-20 09:12:55Z

6

You want to use strftime:

str_time = datetime.strftime(date_time, '%Y-%m-%d %H:%M:%S,%f')

A quick comparison of strftime and strptime:

strftime() is used to convert a datetime object to a string

strptime() is used to convert a date string to a datetime object

Also here's a good resource in the documentation describing the differences: strftime() and strptime() Behavior

Response to Question Edit

In response to your edit strptime takes a string date and converts it into a datetime object. The format you pass to it just tells it how to parse the string to datetime. It does not dictate it's print format. You are calling print on a datetime object in this case so the output is dictated by the __str__ method on the datetime object.

If you want to print it in a certain way pass it to strftime with the format you want to output it as:

obj_time = datetime.strptime(maches[0], '%Y-%m-%d %H:%M:%S,%f')
print(datetime.strftime(obj_time , '%Y-%m-%d %H:%M:%S,%f'))

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Apr 15, 2019 at 4:57

cullzie

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5 Comments

falukky Over a year ago

Can i have simple code example ? i did not understand what i did wrong

cullzie Over a year ago

Your maches[0] is already in the string format you want. You don't need to pass it to strptime.

falukky Over a year ago

TypeError: strptime() takes exactly 2 arguments (1 given)

falukky Over a year ago

i dont want to print but return datetime object with this format

cullzie Over a year ago

@falukky this isn't possible. We cannot store the output format we want in the datetime object. You will need to call strftime on your datetime object to get your string output. Or use @Arunkumar answer to format the string you desire from the datetime object: '{:%Y-%m-%d %H:%M:%S.%f}'.format(date_time)

Shehan Ishanka · Accepted Answer · 2019-04-15 04:56:41Z

1

Use strftime.

date_time = datetime.now()
print(date_time)
print(datetime.strftime(date_time, '%Y-%m-%d %H:%M:%S,%f'))

2019-04-15 10:26:08.637630
2019-04-15 10:26:08,637630

answered Apr 15, 2019 at 4:56

Shehan Ishanka

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Comments

Arun Kumar · Accepted Answer · 2019-04-15 05:05:34Z

0

Use this you get this format '%Y-%m-%d %H:%M:%S,%f'

print '{:%Y-%m-%d %H:%M:%S.%f}'.format(date_time)

answered Apr 15, 2019 at 5:05

Arun Kumar

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