(i) The date and time of the boost library

(i) The date and time of the boost libraryFirst, the timer

Timers, it is often useful to count the execution time of a function in a project.

#include <boost/timer.hpp>

voidprintusertime() 

{

    Boost::timer T;  //Define a timing class to start timing

    std::" maximum measurable time:" << T.elapsed_max ()/"hstd::endl;     

    std::" maximum time measurable:"sstd::endl;    

    std::" use time:" <<  Std::endl;   

}

Second, get the current date

D (day_clock::local_day ()); 

Iii. converting a string into a date

Date fmtdt1 = from_string ("2013-04-21");  

Date FMTDT2 = date_from_iso_string ("20140320");  

Date FMTDT3 = from_us_string ("1-25-2003")  

Iv. converting dates to strings

To_iso_string

To_simple_string

Five, date length, in days units

Date_duration dur = End-beg;    

cout << dur.days () << Endl;

Vi. Date Range

Receive two time points to determine the intersection of the time interval, the set, the interval, the interval translation, and so on the operation of the interval

End);

Seven, date arithmetic

Provides days, months, years three time classes that can be mixed with date classes

m (1);

M

Viii. date, date and string conversions, date plus subtraction operations

#include <boost/date_time/gregorian/gregorian.hpp>

PrintDate()

{

    namespace Boost::gregorian;

    Std

    Get current time

    DateD(Day_clock::local_day ()); 

    The date class supports IO stream output

    cout << D << Endl;

    Convert date to string  20140320

    cout << to_iso_string (d) << Endl;

    Convert a string to a date

    Date fmtdt1 = from_string ("2013-04-21");  

    Date FMTDT2 = from_string ("2013/04/21");  

    "<< fmtdt2 << Endl;

    Day(1);

    M(1);

    Y(1);

    Date Beg = d + day-y;

    Date end = d + M;

    "Yes"No") << Endl;   

    Date Date = date_duration, and date +/-Date_duration is also supported 

    Date length

    Date_duration dur = End-beg;    

    cout << dur.days () << Endl;

    Date Range

    P(Beg, dur);

    cout << p << Endl;

}

Nine, time, time and string conversion, time plus subtraction operation

and date similar, also provide time length: time_duration, Time range: time_period, timely Operation class hours, minutes, seconds, milliseconds, microseconds

#include <boost/date_time/posix_time/posix_time.hpp>

Printtime()

{

    Namespace boost::p osix_time;

    Std

    namespace Boost::gregorian;

    Get local time

    T1(Second_clock::local_time ());

    Get UTC time

    T2(Second_clock::universal_time ());

    cout << T1 << T2 << Endl;

    Time 8:30

    Dur(8,30,0);

    H(1);

    M(1);

    s(1);

    Mi(1);   //MS 

    Mic(1);  //μs 

    Nanoseconds na (1);    Nanosecond   requires system support

    T3(date(2013,4,20)); 

    T4(date(2013,4,20), dur); 

    T5(date(2013,4,20), mic); 

    cout << to_simple_string (T3) <<<<  to_simple_string (T5) << Endl; 

    The operation of time, similar to the date, is very simple.

    cout << t2-t1 << Endl;

}

Ten, the format of time

Mainly used for two classes, input: Date_input_facet, Output: Date_facet
The time format class is: Time_input_facet time_facet boost::p osix_time::time_facet *timefmt = new boost::p Osix_time::time_facet ("%Y-% m-%d%h:%m:%s ");

#include <boost/date_time/gregorian/gregorian.hpp>

FormatDateTime()

{

    namespace Boost::gregorian;

    Std

    Input

    Date D;

    std::"140320";  

    New Boost::gregorian::d ate_input_facet ("%y%m%d   

    std::ss1(teststring); 

    Ss1.imbue (Locale (Ss1.getloc (), FMT));

    SS1 >> D;

    cout << D << Endl;

    Output

    Boost::gregorian::d ateD2  

    New Boost::gregorian::d ate_facet ("%A,%d%B%Y   

    std::cout.imbue (std::locale (std::    

    STD::

    Custom

    Std::locale::global (std::locale ("German    

    STD::String months[12] = {"Januar","Februar","März", "april "mai"  " Juni "juli  "august ", " september "oktober"  " November "dezember"};  

 std::string weekdays[7] = { "sonntag"  "montag"  " Dienstag "mittwoch", donnerstag", Span class= "hljs-string" > "freitag",  "samstag"};      

    Boost::gregorian::d ateD3  

    New Boost::gregorian::d ate_facet ("%A,%d.%B%Y   

    Df->long_month_names (std::vector<std::    

    Df->long_weekday_names (std::vector<std::    

    std::cout.imbue (std::locale (std::    

    STD::

}

(i) The date and time of the boost library