Section 5.14 - Exercise 1

[AlJohri]

Exercise 1
The time module provides a function, also named time, that returns the current Greenwich Mean Time in “the epoch”, which is an arbitrary time used as a reference point. On UNIX systems, the epoch is 1 January 1970.

>> import time
>> time.time()
1437746094.5735958

Write a script that reads the current time and converts it to a time of day in hours, minutes, and seconds, plus the number of days since the epoch.

---

I think asking a student to convert the epoch into time of day might be a little too complicated for Exercise 1 of the chapter. Dates aren't the easiest subject to deal with this early into python. I was trying to use ThinkPython 2 to tutor a student today and found it to be far too advanced having just learned conditionals and floor division in the same chapter.

>>> # Part 1

>>> mydate = int(1437746094.5735958)
>>> num_days = mydate // 3600 // 24
>>> print(num_days, "days since epoch")

16640 days since epoch

>>> # Part 2

>>> midnight_on_mydate = num_days * 24 * 3600
>>>
>>> seconds_since_midnight = mydate - midnight_on_mydate
>>>
>>> hours = seconds_since_midnight // 3600
>>> minutes = (seconds_since_midnight - (hours * 3600)) // 60
>>> seconds = seconds_since_midnight - (hours * 3600 + minutes * 60)
>>>
>>> time_of_day = "%s:%s:%s" % (hours, minutes, seconds)
>>>
>>> print(time_of_day, "on", num_days, "days since epoch")

13:54:54 on 16640 days since epoch

[JCWDFCS]

import time

epoch = time.time()
seconds_in_a_day = 24 * 60 * 60
seconds_in_an_hour = 60 * 60
seconds_in_a_minute = 60

days = epoch // seconds_in_a_day
hours = (epoch % seconds_in_a_day) // seconds_in_an_hour + 8
minutes = (epoch % seconds_in_a_day) % seconds_in_an_hour // seconds_in_a_minute
seconds = (epoch % seconds_in_a_day) % seconds_in_an_hour % seconds_in_a_minute
print("%s: %s: %s: %s" %(days, hours, minutes, seconds))
print("Beijing Current time is %d: %d: %d: %d" %(days, hours, minutes, seconds")) 

[AndrewReifel]

Looks like the extra closing quote is not needed on final print statement.

[Janardanchorat]

import time mytime=time.time() seconds=mytime mins=mytime/60 hrs=mins/60 days=hrs/24 weeks=days/7 months=weeks/4 years=months/12 print(seconds,mins,hrs,days,weeks,months,years)

[neo-shruti-ghosh]

import time

epoch=time.time()

#606024=86400
total_sec = epoch % 86400
#60*60
hours = int(total_sec/3600)
total_minutes = int(total_sec/60)
mins = total_minutes % 60
sec = int(total_sec % 60)

days=int(epoch/86400)

print("The Current time is",hours,':',mins,':',sec)
print("Days since epoch:", days)