Date Conversion

Date Conversion

Can you point me at or come up with a generic class that allows date manipulation and storage without running into OS-specific or February 29 or Y2K issues?

The Standard Library’s date and time functions are declared in the header. All these functions are Y2K ready. C and C++ represent time as a signed integer that has at least 32 bits (64-bit environments often use a 64-bit datatype) and holds the number of seconds elapsed since the “epoch” (e.g., 1/1/1970 00:00:00). A 32-bit unit can safely represent any date between the epoch and January 18, 2038 10:14:08.

If you’re relying on the Standard Library’s functions, your code is immune to OS-specific, time-related bugs such as Feb29 or Y2K.

If you wish to compare two dates, use the difftime() function. For example:

#include time_t now = time(0); // get current time time_t yestderday = now-(24*60*60);double diff_in_sec = difftime(now, yesterday);

You can either write a class that wraps these functions or use them directly. My advice is to avoid any non-standard date and time functions and classes because they tend to be inefficient and buggy.

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