Add working/business days to a date

[brucealdridge]

Add the ability to calculate business days. Ie 'Expect your parcel to arrive in 7 business days'

$sevenBusinessDays = Yasumi::addWorkingDays('USA', 7, new \DateTime('2016-07-01', new \DateTimeZone('America/New_York')))
$sevenBusinessDays->format('Y-m-d');

[stelgenhof]

@brucealdridge Thanks for this one! I like it :) If I understand correctly this feature returns the first coming business in the next ## days, right? In that case, I prefer the function name to represent what it returns rather than the action ('adding days').

For completeness sake, we should also then have the possibility to look at past business days. Can't think of a use case right now, however would be good to have too.

[brucealdridge]

An example would be customer service. Instead of

echo "We will get back to you within 2 business days";

echo "We will get back to you by ".
  Yasumi::addWorkingDays(
      'USA', 
      2, 
      new \DateTime('2016-07-01', new \DateTimeZone('America/New_York'))
   )->format('Y-m-d');

Fairly trivial to add removeBusinessDays, nextWorkingDay and previousWorkingDay but I see less of a use case for those

[stelgenhof]

Yes, that makes sense. I was talking more semantically as for the function names. I think nextWorkingDay and previousWorkingDay make more sense. The functions then return either the next or previous working day based on the number of days given (as you coded). The default could be 1 day.

[brucealdridge]

Sounds good, I'll adjust the naming