SimpleDate for C++

SimpleDate is a small C++ library that gives you an implementation of Date type in readable format - YYYYMMDD.

It's important when you need to see dates in a debugger without extra converting, logging, printing, etc.

It uses int to store a date. For example, date 26 January 1980 be stored in a number 19800126.

Relational and arithmetic operators have been overloaded and you can compare and assign values using standard operators (= == != >= <= ++ -- += -=).

There are some extra methods for date manipulating, like begin or end of a month, begin or end of a quarter, begin or end of a year.

Examples of usage

Get current date

#include "date.h"
...
Date now = Date::now();

Initialize

Date date(1980, 12, 31);

Set date

Date date;
date.setDate(1980, 11, 30);

Get year, month, day from date

int year = date.year();
int month = date.month();
int day = date.day();

Get size of a month

int monthSize = Date::monthSize(2018, 2); // 28

Check date

if (date.isValid())
    ...

Shift date

date++;                 // next day
date += 7;              // over week
date.shift(0, 1, 0);    // shift for 1 month
date.shift(1, 0, 0);    // shift for 1 year
date--;                 // prior day
date.shift(-1,0,0);     // shift for -1 year

Begin of a month

date.setDate(1980, 12, 31);
date.monthBegin();      // 31.12.1980 -> 01.12.1980

End of a month

date.setDate(1980, 12, 15);
date.monthEnd();        // 15.12.1980 -> 31.12.1980

Some extra functions

Date date(2010, 8, 25);
date.quarterBegin();    // 01.07.2010
date.quarterEnd();      // 30.09.2010
date.yearBegin();       // 01.01.2010
date.yearEnd();         // 31.12.2010

Interval between 2 dates

Date begin(1980, 1, 1);
Date end(1981, 2, 2);
Date interval = Date::diff(begin, end); // 010101 = 1 year 1 month 1 day

interval = Date::diff(end, begin); // -10101 = -1 year -1 month -1 day
if (interval < 0)
    ...

Convert date to string

Date date(2010, 8, 25);
date.toString('-');     // "2010-08-25"