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date-time.md

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Date and Time



datetime

from datetime import date 
from datetime import time
from datetime import datetime

>>> today = date.today()
>>> print(today)
2019-03-04

>>> print(today.day, today.month, today.year)
(4, 3, 2019)

>>> print(today.weekday()) ## returns an integers in the range 0 to 6, where 0 represents Monday and 6 represents Sunday.
0

>>> today = datetime.now()
>>> print(today)
2019-03-04 21:55:56.228000

>>> time = datetime.time(datetime.now())
>>> print(time) 
21:56:16.040000

Time Delta

This module is used to perform date and time calculations.

from datetime import date 
from datetime import time
from datetime import datetime
from datetime import timedelta

print(timedelta(days=365, hours=5, minutes=1)) # 365 days, 5:01:00
today  = datetime.now()
print(today + timedelta(days=60)) # 2019-03-29 18:41:46.720811
print(today - timedelta(days=57)) # 2018-12-02 18:42:36.774421

timedelta object takes the following parameters: days, seconds, microseconds, milliseconds, minutes, hours, weeks. To find past or future dates, simply use plus or minus sign with the required difference from current date.

Calendar

Calendar related operations and displaying in formatted way.

import calendar

c = calendar.TextCalendar(calendar.MONDAY)
st = c.formatmonth(2017, 1, 0,0)
print(st)

hc = calendar.HTMLCalendar(calendar.MONDAY)
st = hc.formatmonth(2017, 1)
print(st)

#Output
'''
    January 2017
Mo Tu We Th Fr Sa Su
                   1
 2  3  4  5  6  7  8
 9 10 11 12 13 14 15
16 17 18 19 20 21 22
23 24 25 26 27 28 29
30 31

<table border="0" cellpadding="0" cellspacing="0" class="month">
<tr><th colspan="7" class="month">January 2017</th></tr>
<tr><th class="mon">Mon</th><th class="tue">Tue</th><th class="wed">Wed</th><th class="thu">Thu</th><th class="fri">Fri</th><th class="sat">Sat</th><th class="sun">Sun</th></tr>
<tr><td class="noday">&nbsp;</td><td class="noday">&nbsp;</td><td class="noday">&nbsp;</td><td class="noday">&nbsp;</td><td class="noday">&nbsp;</td><td class="noday">&nbsp;</td><td class="sun">1</td></tr>
<tr><td class="mon">2</td><td class="tue">3</td><td class="wed">4</td><td class="thu">5</td><td class="fri">6</td><td class="sat">7</td><td class="sun">8</td></tr>
<tr><td class="mon">9</td><td class="tue">10</td><td class="wed">11</td><td class="thu">12</td><td class="fri">13</td><td class="sat">14</td><td class="sun">15</td></tr>
<tr><td class="mon">16</td><td class="tue">17</td><td class="wed">18</td><td class="thu">19</td><td class="fri">20</td><td class="sat">21</td><td class="sun">22</td></tr>
<tr><td class="mon">23</td><td class="tue">24</td><td class="wed">25</td><td class="thu">26</td><td class="fri">27</td><td class="sat">28</td><td class="sun">29</td></tr>
<tr><td class="mon">30</td><td class="tue">31</td><td class="noday">&nbsp;</td><td class="noday">&nbsp;</td><td class="noday">&nbsp;</td><td class="noday">&nbsp;</td><td class="noday">&nbsp;</td></tr>
</table>
'''

.HTMLCalendar return HTML code for the calendar in table format. Calendar.SUNDAY indicates that the first day in the formatted calendar will be Sunday. In the above example, Calendar.MONDAY is used. Hence, we can see in the output that the first day in the representation is Monday.

Iterating through dates of a month

import calendar

c = calendar.TextCalendar(calendar.MONDAY)
for i in c.itermonthdays(2017, 8):
    print(i, end = ' ')
print('')
for name in calendar.month_name:
    print(name, end = ' ')
print('')
for day in calendar.day_name:
    print(day, end = ' ')
'''
Output:
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 0 0 0
 January February March April May June July August September October November December
Monday Tuesday Wednesday Thursday Friday Saturday Sunday
'''

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