Days between dates
Calculate the number of days between two dates. Date input should be in the form YYYY-MM-DD.
You are encouraged to solve this task according to the task description, using any language you may know.
- Task
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
Several examples in C including an origin based algorithm can be foud here: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)
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