'localtime': This function or variable may be unsafe. Consider using localtime

Question：

大家好！
C++ 在程序中进行类型转换时，编译提示告警：DWORD 与结构指针转换时提示
警告8 warning C4312: “reinterpret_cast”: 从“DWORD”转换到更大的“HISDATAREC *”。 HISDATAREC是结构

使用localtime告警：
time_t ttNow;
ttNow = time(NULL); tm *pTime = localtime(&ttNow);
提示：
警告 14 warning C4996: 'localtime': This function or variable may be unsafe. Consider using localtime_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

请专家指教，怎样避免这种警告？

Answer：

1, 在项目设置的C/C++选项中，把检查64位移植性去掉。
2, 方案a：使用_localtime_s, _localtime32_s, _localtime64_s这3个函数代替localtime
方案b：去掉C4996警告，比如按照提示所说
#define _CRT_SECURE_NO_WARNINGS 1
或者直接#pragma warning( disable : 4996 )

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