Days between dates: Difference between revisions
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https://stackoverflow.com/questions/12862226/the-implementation-of-calculating-the-number-of-days-between-2-dates |
https://stackoverflow.com/questions/12862226/the-implementation-of-calculating-the-number-of-days-between-2-dates |
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This example is |
This example is similar to one described on the following page as the origin based algorithm, there implemented in c: http://www.sunshine2k.de/articles/coding/datediffindays/calcdiffofdatesindates.html. |
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def days( y,m,d ): |
def days( y,m,d ): |
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''' |
''' input year and month are shifted to begin the year in march''' |
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m = (m + 9) % 12 |
m = (m + 9) % 12 |
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y = y - m/10 |
y = y - m/10 |
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''' with (m*306 + 5)/10 the number of days from march 1 to the current 'm' month ''' |
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result = 365*y + y/4 - y/100 + y/400 + (m*306 + 5)/10 + ( d - 1 ) |
result = 365*y + y/4 - y/100 + y/400 + (m*306 + 5)/10 + ( d - 1 ) |
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return result |
return result |
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Revision as of 11:37, 30 September 2019
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 similar to one described on the following page as the origin based algorithm, there 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 ):
input year and month are shifted to begin the year in march m = (m + 9) % 12 y = y - m/10
with (m*306 + 5)/10 the number of days from march 1 to the current 'm' month 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