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Date and time handling example code

Basics: general date and time handling

Example code

Found in: examples\Base\DateAndTime\Basics

The files reproduced here are the main files contained in the examples directory. Some extra files may be needed to run the examples, and these will be found in the appropriate examples directory.

//
// Copyright (C) Symbian Software Ltd 2000-2005.  All rights reserved.
//
// NOTE, to aid clarity, all literal text constructed using the _LIT macro
//       is declared immediately before use.
//       In production code, it may be more efficient for _LIT macros to be
//       declared at file scope. 
//       

#include "CommonFramework.h" // standard example stuff


// advance declarations
void printDateTime(TTime);
void showDateProperties(TTime);
void showFormatting(TTime);
void printDifferences(TTime, TTime);


void WaitForKey()
    {
    _LIT(KMsgPressAnyKey,"Press any key to continue\n\n");
    console->Printf(KMsgPressAnyKey);
    console->Getch();
    }


LOCAL_C void doExampleL()
    {
    TTime time;         // time in microseconds since 0AD nominal Gregorian
    TDateTime dateTime; // year-month-day-hour-minute-second-microsecond


        //
        // set and print current date/time
        //
    time.HomeTime(); // set time to home time

    _LIT(KTxt1,"Current date and time in fields (locale independent):\n");
    console->Printf(KTxt1);


        //
        // print all seven fields
        //
    dateTime=time.DateTime();    // convert to fields
    _LIT(KFormat1,"%d %d %d %d:%d:%d.%d\n");
    console->Printf(KFormat1,
        dateTime.Year(),
        TInt(dateTime.Month()+1),// <-- Print month as a TInt to preserve
                                 //     locale independence
        dateTime.Day()+1,        // <-- Day and month ranges begin 
                                 //     at zero (0-30 and 0-11), 
                                 //     so add one when printing
        dateTime.Hour(), dateTime.Minute(), dateTime.Second(),
        dateTime.MicroSecond());
        

        //
        // reset date to 31st December 1996
        //
    TInt year=1996, month=12, day=31; // date, as if from text input
    TInt error=dateTime.Set(year,TMonth(month-1),day-1,23,59,59,999999);// note: month and 
                                                                        // day are 
                                                                        // zero-offset!
    User::LeaveIfError(error);        // check date/time set ok
    time=dateTime;                    // Time = 31st December 1996 23:59 

    _LIT(KTxt2,"Resetting date and time...\n");
    console->Printf(KTxt2);
    printDateTime(time); 
    WaitForKey();

        //
        // Add intervals to time
        //
    TTimeIntervalMonths timeIntervalMonths(2);
    time+=timeIntervalMonths;         // Add two months 
    _LIT(KTxt3,"Adding 2 months to date...\n");
    console->Printf(KTxt3);
    printDateTime(time); 

    time-=timeIntervalMonths;         // Subtract two months 
    _LIT(KTxt4,"Subtracting 2 months from date...\n");
    console->Printf(KTxt4);
    printDateTime(time); 

    WaitForKey();

    TTimeIntervalSeconds timeIntervalSeconds(2147483647);
    time+=timeIntervalSeconds;        // Add max. seconds +1 to time to show overflow
    _LIT(KTxt5,"Adding 2147483648 seconds to date/time - should overflow...\n");
    console->Printf(KTxt5);
    printDateTime(time); 

    timeIntervalSeconds=2147483647;
    time+=timeIntervalSeconds;        // Add max. seconds to time
    _LIT(KTxt6,"Adding 2147483647 seconds to date/time...\n");
    console->Printf(KTxt6);
    printDateTime(time); 

    WaitForKey();

        //
        // Set date to Monday 6th Jan 1997 
        //
    day=5, month=1, year=1997; 
    dateTime.SetMonth(TMonth(month-1));
    dateTime.SetDay(day);
    dateTime.SetYear(year);
    time=dateTime;
    
    _LIT(KTxt7,"Resetting date ...\n");
    console->Printf(KTxt7);
    printDateTime(time); 

    showDateProperties(time);         // Date property functions for Mon 6 Jan 1997 
    WaitForKey();
    showFormatting(time);             // Date and time formatting
    WaitForKey();

        
        //
        // Create a new date, set it to 6th Jan 1996 to
        // show TTime::MonthsFrom()
        //
    TDateTime newDateTime(1996,EJanuary,5,23,59,59,999999);
    TTime newTime(newDateTime);
    printDifferences(time, newTime);

        //
        // Set newTime to 7th January 1996 00:00:00:000000
        // and print difference in months again
        //
    TTimeIntervalMicroSeconds timeIntervalMicroSeconds(1);
    newTime+=timeIntervalMicroSeconds;
    printDifferences(time, newTime);
    
        //
        // Set newTime to 6th January 1998 23:23:59:999999
        //
    newDateTime.SetYear(1998);
    newTime=newDateTime;
    printDifferences(time, newTime);
        //
        // Set newTime to 7th January 1998 00:00:00:000000
        //
    newTime+=timeIntervalMicroSeconds;
    printDifferences(time, newTime);
    }

void printDateTime(TTime aTime)
    {
    TBuf<40> dateTimeString;

    _LIT(KFormat2,"%D%M%Y%/0%1%/1%2%/2%3%/3 %:0%H%:1%T%:2%S.%C%:3");
    aTime.FormatL(dateTimeString,KFormat2);

    _LIT(KFormat3,"new date and time: %S \n");
    console->Printf(KFormat3,&dateTimeString);
    }

void showDateProperties(TTime aTime)
    {
    //
    // Demonstrate date property functions
    //
    TBuf<10> nameString;

    _LIT(KFormat4,"%F%N");
    aTime.FormatL(nameString,KFormat4); // Get month name

    _LIT(KFormat5,"Days in month (%S) = %d\n");
    console->Printf(KFormat5,&nameString,aTime.DaysInMonth());

    _LIT(KFormat6,"%E");
    aTime.FormatL(nameString,KFormat6); // Get day name

    _LIT(KFormat7,"Day number in year is %d\n");
    console->Printf(KFormat7,aTime.DayNoInYear());   

    _LIT(KFormat8,"Day number in week = %d (%S)\n");
    console->Printf(KFormat8,aTime.DayNoInWeek(),&nameString);

        //
        // Demonstrate first week in year rules
        //
    _LIT(KFormat9,"Week number in year = %d\n");
    console->Printf(KFormat9,aTime.WeekNoInYear());
    
        //
        // Change week number in year rule
        //
    _LIT(KFormat10,"Counting first full week as week 1,\nweek number in year = %d\n");
    console->Printf(KFormat10,aTime.WeekNoInYear(EFirstFullWeek));
    }


void showFormatting(TTime aTime)
    {
    //
    // Format date and time, using system default locale settings
    //
    _LIT(KTxt8,"Formatting the date and time\n");
    console->Printf(KTxt8);

        //
        // Print full day name, day number in month with leading zeros, 
        // date suffix, month name, year
        //  
    TBuf<40> dateString; // This holds the formatted date and time string
    
    _LIT(KFormat11,"%E%D%X%N%Y %1 %2 %3");
    aTime.FormatL(dateString,KFormat11); 

    _LIT(KFormat12,"Full date with date suffix = %S\n");
    console->Printf(KFormat12,&dateString);

        //
        // Print abbreviated day name, day number in month, 
        // date suffix, abbreviated month name, year
        //
    _LIT(KFormat13,"%*E%*D%X%*N%Y %1 %2 %3");
    aTime.FormatL(dateString,KFormat13); 

    _LIT(KFormat14,"Full date with abbreviated names= %S\n");
    console->Printf(KFormat14,&dateString);

        //
        // Print date in numeric form with leading zeros, using default 
        // date ordering (European) and default date separator characters
        //
    _LIT(KFormat15,"%D%M%Y%/0%1%/1%2%/2%3%/3");
    aTime.FormatL(dateString,KFormat15); 

    _LIT(KFormat16,"dd/mm/yyyy = %S\n");
    console->Printf(KFormat16,&dateString);

    
        //
        // Print time using default time separator characters 
        // in 12 and 24 hour clock formats
        //
    _LIT(KFormat17,"%:0%H%:1%T%:2%S.%*C3%:3");
    aTime.FormatL(dateString,KFormat17);

    _LIT(KFormat18,"Hour, minute, second, microsecond (24 hr clock) = %S\n");
    console->Printf(KFormat18,&dateString);

    _LIT(KFormat19,"%:0%I%:1%T%:2%S.%*C3%:3%A");
    aTime.FormatL(dateString,KFormat19);

    _LIT(KFormat20,"Hour, minute, second, microsecond (12 hr clock) = %S\n");
    console->Printf(KFormat20,&dateString);
    }

void printDifferences(TTime aTime, TTime aNewTime)
    {
    //
    // Print number of months difference between two dates
    //
    TBuf<40> dateString;
    TBuf<40> newDateString;
    TInt     numberOfMonths;
    
    _LIT(KFormat21,"%D%M%Y%/0%1%/1%2%/2%3%/3 %:0%H%:1%T%:2%S.%C%:3");
    aTime.FormatL(dateString,KFormat21);

    _LIT(KFormat22,"%D%M%Y%/0%1%/1%2%/2%3%/3 %:0%H%:1%T%:2%S.%C%:3");
    aNewTime.FormatL(newDateString,KFormat22);

    _LIT(KFormat23,"Number of months between:\n%S and\n%S = %d\n");
    numberOfMonths = (aTime.MonthsFrom(aNewTime)).Int();
    console->Printf(KFormat23,&dateString,&newDateString,numberOfMonths);    
    }

// Basics.mmp
//
// Copyright (C) Symbian Software Ltd 2000-2005.  All rights reserved.

// using relative paths for source and userinclude directories

// No explicit capabilities required to run this.

TARGET        DateAndTimeBasics.exe
TARGETTYPE    exe
UID           0
VENDORID 0x70000001

SOURCEPATH    .
SOURCE        Basics.cpp

USERINCLUDE   .
USERINCLUDE   ..\..\CommonFramework
SYSTEMINCLUDE \Epoc32\include

LIBRARY       euser.lib

CAPABILITY    None

// BLD.INF
// Component description file
//
// Copyright (C) Symbian Software Ltd 2000-2005.  All rights reserved.

PRJ_MMPFILES

Basics.mmp

"CommonFramework.h" is found in examples/Base/CommonFramework

Description

This example demonstrates date and time handling.

Classes used

Security issues

The example requires no specific capabilities in order to run - and does not demonstrate any security issues.

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