dates.add-days
Shift an ISO date by a whole number of days, forwards or backwards, with exact calendar arithmetic.
add_days in PythonTagged arithmetic
3 capabilities
math.rational
Exact fraction arithmetic, always reduced, for rates and ratios that must not drift.
A group of 8:
calculate_rational, rational, add_rational, subtract_rational, multiply_rational, divide_rational, compare_rational, rational_to_integer
money.add
Add, subtract and negate monetary amounts, refusing to mix currencies.
add_money in Python