Boost date_time usage

1 posix_time

Boost: posix_time: ptime ptime1 = boost: posix_time: time_from_string (STD: string (str1 )));

Boost: posix_time: ptime ptime2 = boost: posix_time: time_from_string (STD: string (str2 )));

Determine equal functions

(Ptime1 = ptime2 )? True: false

Greaterthan Function

(Ptime1> ptime2 )? True: false

Lessthan Function

(Ptime1 <ptime2 )? True: false

When time1 = 00:00:00

Time2 = 2011-01-11

Test results:

Time1 and time2 are not equal

Time1 is not greater than time2

Time1 is smaller than time2

2 calculate the number of days of time difference

Date day1 = from_simple_string ("2001-10-9 ");
Date today = day_clock: local_day ();
Days days_limint = today-day1;
Struct stat stinfo;
Time_t tt;
Stat ("F: \ yuj \ test_env \ 11.txt", & stinfo );
Tt = stInfo. st_ctime;
Ptime pt = boost: posix_time: from_time_t (tt );
Date fileDate = pt. date ();
Days days_limint2 = fileDate-today;
Printf ("difference % d day \ n", days_limint.days ());
Printf ("difference % d day \ n", days_limint2.days ());