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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>date.h Source File</title><link href="doxygen.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.2.18 --><center><a class="qindex" href="index.html">Main Page</a> <a class="qindex" href="hierarchy.html">Class Hierarchy</a> <a class="qindex" href="annotated.html">Compound List</a> <a class="qindex" href="files.html">File List</a> <a class="qindex" href="functions.html">Compound Members</a> </center><hr><h1>date.h</h1><div class="fragment"><pre>00001 <span class="comment">//-< DATE.H >--------------------------------------------------------*--------*</span>00002 <span class="comment">// FastDB Version 1.0 (c) 1999 GARRET * ? *</span>00003 <span class="comment">// (Main Memory Database Management System) * /\| *</span>00004 <span class="comment">// * / \ *</span>00005 <span class="comment">// Created: 30-Apr-2000 K.A. Knizhnik * / [] \ *</span>00006 <span class="comment">// Last update: 30-Apr-2000 K.A. Knizhnik * GARRET *</span>00007 <span class="comment">//-------------------------------------------------------------------*--------*</span>00008 <span class="comment">// Date field type</span>00009 <span class="comment">//-------------------------------------------------------------------*--------*</span>00010 00011 <span class="preprocessor">#ifndef __DATE_H__</span>00012 <span class="preprocessor"></span><span class="preprocessor">#define __DATE_H__</span>00013 <span class="preprocessor"></span>00014 <span class="preprocessor">#include "stdtp.h"</span>00015 <span class="preprocessor">#include "class.h"</span>00016 00017 BEGIN_FASTDB_NAMESPACE00018 00019 <span class="preprocessor">#if !defined(NO_PTHREADS) && !defined(_WIN32)</span>00020 <span class="preprocessor"></span><span class="preprocessor">#define USE_REENTRANT_LIBRARY</span>00021 <span class="preprocessor"></span><span class="preprocessor">#endif</span>00022 <span class="preprocessor"></span>00023 <span class="keyword">class </span>FASTDB_DLL_ENTRY dbDate { 00024 int4 jday;00025 <span class="keyword">public</span>:00026 <span class="keywordtype">bool</span> operator == (dbDate <span class="keyword">const</span>& dt) { 00027 <span class="keywordflow">return</span> jday == dt.jday;00028 }00029 <span class="keywordtype">bool</span> operator != (dbDate <span class="keyword">const</span>& dt) { 00030 <span class="keywordflow">return</span> jday != dt.jday;00031 }00032 <span class="keywordtype">bool</span> operator > (dbDate <span class="keyword">const</span>& dt) { 00033 <span class="keywordflow">return</span> jday > dt.jday;00034 }00035 <span class="keywordtype">bool</span> operator >= (dbDate <span class="keyword">const</span>& dt) { 00036 <span class="keywordflow">return</span> jday >= dt.jday;00037 }00038 <span class="keywordtype">bool</span> operator < (dbDate <span class="keyword">const</span>& dt) { 00039 <span class="keywordflow">return</span> jday < dt.jday;00040 }00041 <span class="keywordtype">bool</span> operator <= (dbDate <span class="keyword">const</span>& dt) { 00042 <span class="keywordflow">return</span> jday <= dt.jday;00043 }00044 <span class="keywordtype">int</span> operator - (dbDate <span class="keyword">const</span>& dt) { 00045 <span class="keywordflow">return</span> jday - dt.jday;00046 }00047 <span class="keywordtype">int</span> operator + (<span class="keywordtype">int</span> days) { 00048 <span class="keywordflow">return</span> jday + days;00049 }00050 dbDate& operator += (<span class="keywordtype">int</span> days) { 00051 jday += days;00052 <span class="keywordflow">return</span> *<span class="keyword">this</span>;00053 }00054 dbDate& operator -= (<span class="keywordtype">int</span> days) { 00055 jday -= days;00056 <span class="keywordflow">return</span> *<span class="keyword">this</span>;00057 }00058 <span class="keyword">static</span> dbDate current() { 00059 time_t now = time(NULL);00060 <span class="keyword">struct </span>tm* tp;00061 <span class="preprocessor">#ifdef USE_REENTRANT_LIBRARY</span>00062 <span class="preprocessor"></span> <span class="keyword">struct </span>tm t;00063 tp = localtime_r(&now, &t);00064 <span class="preprocessor">#else </span>00065 <span class="preprocessor"></span> tp = localtime(&now);00066 <span class="preprocessor">#endif</span>00067 <span class="preprocessor"></span> <span class="keywordflow">return</span> dbDate(tp->tm_year + 1900, tp->tm_mon + 1, tp->tm_mday);00068 }00069 00070 dbDate() { 00071 jday = -1;00072 } 00073 <span class="keywordtype">bool</span> isValid()<span class="keyword">const</span> { 00074 <span class="keywordflow">return</span> jday != -1;00075 }00076 00077 <span class="keywordtype">unsigned</span> JulianDay() { <span class="keywordflow">return</span> jday; }00078 00079 <span class="keywordtype">void</span> clear() { jday = -1; }00080 00081 dbDate(<span class="keywordtype">int</span> year, <span class="keywordtype">int</span> month, <span class="keywordtype">int</span> day) {00082 <span class="comment">/*</span>00083 <span class="comment"> Convert Gregorian calendar date to the corresponding Julian day number</span>00084 <span class="comment"> j. Algorithm 199 from Communications of the ACM, Volume 6, No. 8,</span>00085 <span class="comment"> (Aug. 1963), p. 444. Gregorian calendar started on Sep. 14, 1752.</span>00086 <span class="comment"> This function not valid before that.</span>00087 <span class="comment"> */</span>00088 nat4 c, ya;00089 <span class="keywordflow">if</span> (month > 2)00090 month -= 3;00091 <span class="keywordflow">else</span> {00092 month += 9;00093 year--;00094 } <span class="comment">/* else */</span>00095 c = year / 100;00096 ya = year - 100*c;00097 jday = ((146097*c)>>2) + ((1461*ya)>>2) + (153*month + 2)/5 + day + 1721119;00098 } <span class="comment">/* jday */</span>00099 00100 <span class="keywordtype">void</span> MDY(<span class="keywordtype">int</span>& year, <span class="keywordtype">int</span>& month, <span class="keywordtype">int</span>& day)<span class="keyword"> const </span>{ 00101 <span class="comment">/*</span>00102 <span class="comment"> Convert a Julian day number to its corresponding Gregorian calendar</span>00103 <span class="comment"> date. Algorithm 199 from Communications of the ACM, Volume 6, No. 8,</span>00104 <span class="comment"> (Aug. 1963), p. 444. Gregorian calendar started on Sep. 14, 1752.</span>00105 <span class="comment"> This function not valid before that.</span>00106 <span class="comment"> */</span>00107 nat4 j = jday - 1721119;00108 <span class="keywordtype">int</span> m, d, y;00109 y = (((j<<2) - 1) / 146097);00110 j = (j<<2) - 1 - 146097*y;00111 d = (j>>2);00112 j = ((d<<2) + 3) / 1461;00113 d = ((d<<2) + 3 - 1461*j);00114 d = (d + 4)>>2;00115 m = (5*d - 3)/153;00116 d = 5*d - 3 - 153*m;00117 d = (d + 5)/5;00118 y = (100*y + j);⌨️ 快捷键说明
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