Tutorial Part 1- A Portable Date Library for C++

Introduction

How do we work with dates and times in C++? One way is to use the C date and time library. This library has functions for manipulating times, such as time, clock and difftime; functions for converting formats of times and dates, e.g., gmtime, localtime, mktime; and various types, such as tm for calendar time, time_t for the time since the epoch, and clock_t, which denotes a process running time. In addition, since C++11 we’ve had a nice library for dealing with points in and durations of time, namely, chrono.

These libraries do have their problems though. The C library (not surprisingly) looks like just that – a C library, and not like C++ code. For example, it has no classes, there are no operators for performing such useful functions as determining the amount of time between two dates or whether one date comes before or after another date, and the internals of the library are exposed and often clumsy to work with. The chrono library overcomes these deficiencies because it was designed from the ground up to be in C++. Unfortunately, chrono has no facilities for working with calendar dates.

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