Date types are immutable, apart from assignment, so you need to make a new date:
date1 = boost::gregorian::date(date1.year(), date1.month(), 1);
Вопрос
For example I have a date object:
boost::gregorian::date date1(2013,1,31);
Now I want to change the day to 1. How to set day to 1?
Решение
Date types are immutable, apart from assignment, so you need to make a new date:
date1 = boost::gregorian::date(date1.year(), date1.month(), 1);