Days between dates
Days between dates
You are encouraged to solve this task according to the task description, using any language you may know.
You are encouraged to solve this task according to the task description, using any language you may know.
- Task
Calculate the number of days between two dates. Date input should be in the form YYYY-MM-DD.
The initial example in python is derived from discussion at: https://stackoverflow.com/questions/12862226/the-implementation-of-calculating-the-number-of-days-between-2-dates
This example is also described on the following page as the origin based algorithm implemented in c:http://www.sunshine2k.de/articles/coding/datediffindays/calcdiffofdatesindates.html.
Python
<lang python>
- !/usr/bin/python
import sys
Difference between two dates = g(y2,m2,d2) - g(y1,m1,d1)
Where g() gives us the Gregorian Calendar Day
def days( y,m,d ):
we shift to march with (m*306 + 5)/10
m = (m + 9) % 12 y = y - m/10 result = 365*y + y/4 - y/100 + y/400 + (m*306 + 5)/10 + ( d - 1 ) return result
def diff(one,two):
[y1,m1,d1] = one.split('-') [y2,m2,d2] = two.split('-') # strings to integers year2 = days( int(y2),int(m2),int(d2)) year1 = days( int(y1), int(m1), int(d1) ) return year2 - year1
if __name__ == "__main__":
one = sys.argv[1] two = sys.argv[2] print diff(one,two)
</lang>
- Output:
python days-between.py 2019-01-01 2019-09-30 272