Set the desired date format to file name in Python

Question

I want to specify the date of the desired format as a file name in this way ;

During [2019-10-01 09:00 ~ 2019-10-02 08:59:59] Save data to 191001-09.txt

I have no idea about this. I could only follow simple code. Please let me know how to fix it :

def timeStamped (fname, fmt = '19% m% d-% H {fname} '):
    return datetime.datetime.now (). strftime (fmt) .format (fname = fname)
with open (timeStamped ('. txt'), 'a') as f_last:
    f_last.write ('data')

Thanks for your link. but there seems to be no way to set a specific time range. It's too hard for me to have an application. — Wl Dl
– Wl Dl, Commented Oct 1, 2019 at 5:31
Thank you for letting me know the bypass method, but it's also difficult. I should think more. Thank you both. — Wl Dl
– Wl Dl, Commented Oct 1, 2019 at 5:32

stovfl · Accepted Answer · 2019-10-01 09:11:57Z

Question: Conditional file name from datetime.now()

Import the required objects
- datetime
- timedelta
```
from datetime import datetime, timedelta
```

Define a function that gets the desired file name from a datetime.date object:

def fname_from_date(date):
    # Rule  09:00:00 ~ day + 1 08:59:59 
    midnight = date.replace(hour=0, minute=0, second=0)
    begin_of_day = date.replace(hour=9, minute=0, second=0)
    end_of_day = date.replace(hour=8, minute=59, second=59)

    # Are we between 'midnight' and 'end_of_day'
    if date >= midnight and date <= end_of_day:
        date = date - timedelta(days=1)
        print('\tNext day -1: {}'.format(date))

    # 191001-09.txt
    fname = date.strftime('%Y%m%d-09')
    return fname

Test the function def fname_from_date(... with static dates.
This requires to create a datetime.date object from datestr.

for datestr in ['2019-10-01 09:00:00', 
                '2019-10-01 11:01:11', 
                '2019-10-02 07:07:07', 
                '2019-10-02 08:59:59']:
    date = datetime.strptime(datestr, '%Y-%m-%d %H:%M:%S')
    print(date)
    fname = '{}.txt'.format(fname_from_date(date))
    print('\t{}'.format(fname))

Output:

2019-10-01 09:00:00
    20191001-09.txt
2019-10-01 11:01:11
    20191001-09.txt
2019-10-02 07:07:07
    Next day -1: 2019-10-01 07:07:07
    20191001-09.txt
2019-10-02 08:59:59
    Next day -1: 2019-10-01 08:59:59
    20191001-09.txt

Usage:

fname = '{}.txt'.format(fname_from_date(datetime.now()))

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