Year 2038 Problem

Czech Post has extended the default duration of the PDZ credit from 5 to 99 years.

The data structure struct timeval still exerts the 2038 problem.

More detailed description:

Windows 32-bit:

• sizeof(time_t) == 4; mktime() doesn't work past year 2038.
• When using CPPFLAGS=-D__MINGW_USE_VC2005_COMPAT: sizeof(time_t) == 8; mktime() works past year 2038.

• struct timeval {
  	long tv_sec;
  	long tv_usec;
  };

• Qt-based mktime() alternative works past year 2038.

Windows 64-bit:

• sizeof(time_t) == 8; mktime() works past year 2038.

• struct timeval {
  	long tv_sec;
  	long tv_usec;
  };

  64-bit Mingw uses a 4-byte wide long int because of MSVC. Struct timeval cannot be used on 64-bit Windows.
• Qt-based mktime() alternative works past year 2038.

FeeBSD 13.0 i386:

• sizeof(time_t) == 4; mktime() doesn't work past year 2038.

• struct timeval {
  	time_t tv_sec;
  	suseconds_t tv_usec;
  };

• Qt-based mktime() alternative works past year 2038.

FeeBSD 13.0 amd64:

• sizeof(time_t) == 8; mktime() doesn't work past year 2038.

• struct timeval {
  	time_t tv_sec;
  	suseconds_t tv_usec;
  };

• Qt-based mktime() alternative works past year 2038.

OpenSUSE Tumbleweed i586:

• sizeof(time_t) == 4; mktime() doesn't work past year 2038.

• struct timeval {
  	__time_t tv_sec;
  	__suseconds_t tv_usec;
  };

• Qt-based mktime() alternative works past year 2038.

Mac OS X 10.11.6 (32-bit app):

• sizeof(time_t) == 4; mktime() doesn't work past year 2038.

• #define _STRUCT_TIMEVAL         struct timeval
  _STRUCT_TIMEVAL {
  	__darwin_time_t         tv_sec;
  	__darwin_suseconds_t    tv_usec;
  };

• Qt-based mktime() alternative works past year 2038.

Mac OS X 10.11.6 (64-bit app):

• sizeof(time_t) == 8; mktime() works past year 2038.

• #define _STRUCT_TIMEVAL         struct timeval
  _STRUCT_TIMEVAL {
  	__darwin_time_t         tv_sec;
  	__darwin_suseconds_t    tv_usec;
  };

macOS 10.14 (64-bit app):

• sizeof(time_t) == 8; mktime() doesn't work past year 2038.

• #define _STRUCT_TIMEVAL         struct timeval
  _STRUCT_TIMEVAL {
  	__darwin_time_t         tv_sec;
  	__darwin_suseconds_t    tv_usec;
  };

• Qt-based mktime() alternative works past year 2038.

Conclusion:

Add a callback-function to provide a functional mktime() alternative for the library.

Explicitly define a struct timeval replacement and enforce a 64-bit-wide integer to hold the tv_sec values.