General Usage Examples
The following provides some sample usage of dates.
See Date Programming
for more details.
using namespace boost::gregorian;
date weekstart(2002,Feb,1);
date weekend = weekstart + week(1);
date d2 = d1 + days(5);
date today = day_clock::local_day();
if (d2 >= today) {} //date comparison operators
date_period thisWeek(d1,d2);
if (thisWeek.contains(today)) {}//do something
//iterate and print the week
day_iterator itr(weekstart);
while (itr <= weekend) {
std::cout << (*itr) << std::endl;
++itr;
}
//input streaming
std::stringstream ss("2004-Jan-1");
ss >> d3;
//date generator functions
date d5 = next_weekday(d4, Sunday); //calculate sunday following d4
//define a shorthand for the
// nth_day_of_the_week_in_month function object
typedef nth_day_of_the_week_in_month nth_dow;
//US labor day is first Monday in Sept
nth_dow labor_day(nth_dow::first,Monday, Sep);
//calculate a specific date from functor
date d6 = labor_day.get_date(2004);
The following provides some example code using times.
See Time Programming
for more details.
use namespace boost::posix_time;
date d(2002,Feb,1); //an arbitrary date
ptime t1(d, hours(5)+nanosec(100)); //date + time of day offset
ptime t2 = t1 - minutes(4)+seconds(2);
ptime now = second_clock::local_time(); //use the clock
date today = now.date(); //Get the date part out of the time
date tommorrow = today + date_duration(1);
ptime tommorrow_start(tommorrow); //midnight
//input streaming
std::stringstream ss("2004-Jan-1 05:21:33.20");
ss >> t2;
//starting at current time iterator adds by one hour
time_iterator titr(now,hours(1));
for (; titr < tommorrow_start; ++titr) {
std::cout << (*titr) << std::endl;
}