dev-notes/Python/Standard Library/time_datetime.md

Time & Datetime Modules Cheatsheet

Time

# epoch: tempo in secondi trascorso (in UNIX parte da 01-010-1970)
import time  # UNIX time
variabile = time.time()  # restituisce il tempo (In secondi) trascorso da 01-01-1970
variabile = time.ctime(epochseconds)  # traforma l'epoca in data

var = time.perf_counter()  # ritorna il tempo di esecuzione attuale
# tempo di esecuzione = tempo inizio - tempo fine

time.srtfrime() format

Format	Data
%a	Locale’s abbreviated weekday name.
%A	Locale’s full weekday name.
%b	Locale’s abbreviated month name.
%B	Locale’s full month name.
%c	Locale’s appropriate date and time representation.
%d	Day of the month as a decimal number [01,31].
%H	Hour (24-hour clock) as a decimal number [00,23].
%I	Hour (12-hour clock) as a decimal number [01,12].
%j	Day of the year as a decimal number [001,366].
%m	Month as a decimal number [01,12].
%M	Minute as a decimal number [00,59].
%p	Locale’s equivalent of either AM or PM.
%S	Second as a decimal number [00,61].
%U	Week number of the year (Sunday as the first day of the week) as a decimal number [00,53].
%w	Weekday as a decimal number [0(Sunday),6].
%W	Week number of the year (Monday as the first day of the week) as a decimal number [00,53].
%x	Locale’s appropriate date representation.
%X	Locale’s appropriate time representation.
%y	Year without century as a decimal number [00,99].
%Y	Year with century as a decimal number.
%z	Time zone offset indicating a positive or negative time difference from UTC/GMT of the form +HHMM or -HHMM
%Z	Time zone name (no characters if no time zone exists).
%%	A literal % character.

Datetime

import datetime
today = datetime.date.today()   # restituisce data corrente
today = datetime.datetime.today()  # restituisce la data e l'ora corrente

# esempio di formattazione
print('Curent Date: {}-{}-{}' .format(today.day, today.month, today.year))
print('Current Time: {}:{}.{}' .format(today.hour, today.minute, today.second))

var_1 = datetime.date(anno, mese, giorno)  # crea oggetto data
var_2 = datetime.time(ora, minuti, secondi, micro-secondi)  # crea oggetto tempo
dt = datetime.combine(var_1, var_2)  # combina gli oggetti data e tempo in un unico oggetto

date_1 = datetieme.date('year', 'month', 'day')
date_2 = date_1.replace(year = 'new_year')

#DATETIME ARITHMETIC
date_1 - date_2  # -> datetime.timedelta(num_of_days)
datetime.timedelta  # durata esprimente differenza tra due oggetti date, time o datetime