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Code: Alles auswählen

def strftime_(datetime_obj):
    if hasattr(datetime_obj, 'hour'):
        template = ('{d.year:=04}{d.month:=02}{d.day:=02}'
                    '{d.hour:=02}{d.minute:=02}')
    else:
        template = '{d.year:=04}{d.month:=02}{d.day:=02}'
    return template.format(d=datetime_obj)

Code: Alles auswählen

import datetime, time
from ctypes import Structure, c_int, CDLL, create_string_buffer, byref

CLIB = CDLL('libc.so.6')

# time struct                               c     python
# tm_sec  int     seconds after the minute  0-61  
# tm_min  int     minutes after the hour    0-59  
# tm_hour int     hours since midnight      0-23  
# tm_mday int     day of the month          1-31
# tm_mon  int     months since January      0-11  1-12
# tm_year int     years since 1900                absolute (x-1900)
# tm_wday int     days since Sunday         0-6   0-6 from Monday
# tm_yday int     days since January 1      0-365 day in year
# tm_isdst int    Daylight Saving Time flag

class Time(Structure):
    _fields_ = [
        ('tm_sec',   c_int),
        ('tm_min',   c_int),
        ('tm_hour',  c_int),
        ('tm_mday',  c_int),
        ('tm_mon',   c_int),
        ('tm_year',  c_int),
        ('tm_wday',  c_int),
        ('tm_yday',  c_int),
        ('tm_isdst', c_int)]
    def __init__(self, t):
        self.tm_year = t.tm_year - 1900
        self.tm_mon = t.tm_mon - 1
        self.tm_yday = t.tm_yday - 1
        self.tm_wday = (t.tm_wday + 1) % 7
        for attr in ['tm_sec', 'tm_min', 'tm_hour', 'tm_mday', 'tm_isdst']:
            setattr(self, attr, getattr(t, attr))

def my_strftime(t, fmt_str):
    out_len = len(fmt_str) + 100 # magic number for room of entry output
    c_string = create_string_buffer(out_len)
    fmt = create_string_buffer(fmt_str)
    ts = Time(t)
    CLIB.strftime(c_string, out_len, fmt, byref(ts))
    return c_string.value

if __name__ == '__main__':
    date = datetime.datetime.now()
    print my_strftime(date.timetuple(), '%c %D %U %j %e')
    print date.strftime('%c %D %U %j %e')
    bastille = datetime.datetime(year=1789,month=7, day=14, hour=5, minute=45)
    print my_strftime(bastille.timetuple(), '%c %D %U %j %e')