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+//
+// HtDateTime.cc
+//
+// HtDateTime: Parse, split, compare and format dates and times.
+// Uses locale.
+//
+// Part of the ht://Dig package <http://www.htdig.org/>
+// Copyright (c) 1999-2004 The ht://Dig Group
+// For copyright details, see the file COPYING in your distribution
+// or the GNU Library General Public License (LGPL) version 2 or later
+// <http://www.gnu.org/copyleft/lgpl.html>
+//
+// $Id: HtDateTime.cc,v 1.20 2004/05/28 13:15:20 lha Exp $
+//
+
+#ifdef HAVE_CONFIG_H
+#include "htconfig.h"
+#endif /* HAVE_CONFIG_H */
+
+#include "HtDateTime.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+
+#ifdef HAVE_STD
+#include <iostream>
+#ifdef HAVE_NAMESPACES
+using namespace std;
+#endif
+#else
+#include <iostream.h>
+#endif /* HAVE_STD */
+
+#ifndef HAVE_STRPTIME
+// mystrptime() declared in lib.h, defined in htlib/strptime.cc
+#define strptime(s,f,t) mystrptime(s,f,t)
+#else /* HAVE_STRPTIME */
+#ifndef HAVE_STRPTIME_DECL
+extern "C" {
+extern char *strptime(const char *__s, const char *__fmt, struct tm *__tp);
+}
+#endif /* HAVE_STRPTIME_DECL */
+#endif /* HAVE_STRPTIME */
+
+///////
+ // Static local variable : Visible only here !!!
+///////
+
+#define MAXSTRTIME 256 // Max length of my_strtime
+
+static struct tm Ht_tm;
+static char my_strtime[MAXSTRTIME];
+
+
+///////
+ // Recognized Date Formats
+///////
+
+// RFC1123: Sun, 06 Nov 1994 08:49:37 GMT
+#define RFC1123_FORMAT "%a, %d %b %Y %H:%M:%S %Z"
+#define LOOSE_RFC1123_FORMAT "%d %b %Y %H:%M:%S"
+
+// RFC850 : Sunday, 06-Nov-94 08:49:37 GMT
+#define RFC850_FORMAT "%A, %d-%b-%y %H:%M:%S %Z"
+#define LOOSE_RFC850_FORMAT "%d-%b-%y %H:%M:%S"
+
+// ANSI C's asctime() format : Sun Nov 6 08:49:37 1994
+#define ASCTIME_FORMAT "%a %b %e %H:%M:%S %Y"
+#define LOOSE_ASCTIME_FORMAT "%b %e %H:%M:%S %Y"
+
+// ISO8601 : 1994-11-06 08:49:37 GMT
+#define ISO8601_FORMAT "%Y-%m-%d %H:%M:%S %Z"
+
+// ISO8601 (short version): 1994-11-06
+#define ISO8601_SHORT_FORMAT "%Y-%m-%d"
+
+// Timestamp : 19941106084937
+#define TIMESTAMP_FORMAT "%Y%m%d%H%M%S"
+
+
+
+///////
+ // Initialization
+///////
+
+const int HtDateTime::days[] = { 31, 28, 31, 30, 31, 30,
+ 31, 31, 30, 31, 30, 31};
+
+
+/////// // Input Formats // ///////
+
+///////
+ // Generalized date/time parser for "LOOSE" formats
+ // - converts LOOSE RFC850 or RFC1123 date string into a time value
+ // - converts SHORT ISO8601 date string into a time value
+ // - autodetects which of these formats is used
+ // - assumes midnight if time portion omitted
+ // We've had problems using strptime() and timegm() on a few platforms
+ // while parsing these formats, so this is an attempt to sidestep them.
+ //
+ // Returns 0 if parsing failed, or returns number of characters parsed
+ // in date string otherwise, and sets Ht_t field to time_t value.
+///////
+#define EPOCH 1970
+
+int HtDateTime::Parse(const char *date)
+{
+ register const char *s;
+ register const char *t;
+ int day, month, year, hour, minute, second;
+
+ //
+ // Three possible time designations:
+ // Tuesday, 01-Jul-97 16:48:02 GMT (RFC850)
+ // or
+ // Thu, 01 May 1997 00:40:42 GMT (RFC1123)
+ // or
+ // 1997-05-01 00:40:42 GMT (ISO8601)
+ //
+ // We strip off the weekday because we don't need it, and
+ // because some servers send invalid weekdays!
+ // (Some don't even send a weekday, but we'll be flexible...)
+
+ s = date;
+ while (*s && *s != ',')
+ s++;
+ if (*s)
+ s++;
+ else
+ s = date;
+ while (isspace(*s))
+ s++;
+
+ // check for ISO8601 format
+ month = 0;
+ t = s;
+ while (isdigit(*t))
+ t++;
+ if (t > s && *t == '-' && isdigit(t[1]))
+ day = -1;
+ else {
+ // not ISO8601, so try RFC850 or RFC1123
+ // get day...
+ if (!isdigit(*s))
+ return 0;
+ day = 0;
+ while (isdigit(*s))
+ day = day * 10 + (*s++ - '0');
+ if (day > 31)
+ return 0;
+ while (*s == '-' || isspace(*s))
+ s++;
+
+ // get month...
+ // (it's ugly, but it works)
+ switch (*s++) {
+ case 'J': case 'j':
+ switch (*s++) {
+ case 'A': case 'a':
+ month = 1;
+ s++;
+ break;
+ case 'U': case 'u':
+ switch (*s++) {
+ case 'N': case 'n':
+ month = 6;
+ break;
+ case 'L': case 'l':
+ month = 7;
+ break;
+ default:
+ return 0;
+ }
+ break;
+ default:
+ return 0;
+ }
+ break;
+ case 'F': case 'f':
+ month = 2;
+ s += 2;
+ break;
+ case 'M': case 'm':
+ switch (*s++) {
+ case 'A': case 'a':
+ switch (*s++) {
+ case 'R': case 'r':
+ month = 3;
+ break;
+ case 'Y': case 'y':
+ month = 5;
+ break;
+ default:
+ return 0;
+ }
+ break;
+ default:
+ return 0;
+ }
+ break;
+ case 'A': case 'a':
+ switch (*s++) {
+ case 'P': case 'p':
+ month = 4;
+ s++;
+ break;
+ case 'U': case 'u':
+ month = 8;
+ s++;
+ break;
+ default:
+ return 0;
+ }
+ break;
+ case 'S': case 's':
+ month = 9;
+ s += 2;
+ break;
+ case 'O': case 'o':
+ month = 10;
+ s += 2;
+ break;
+ case 'N': case 'n':
+ month = 11;
+ s += 2;
+ break;
+ case 'D': case 'd':
+ month = 12;
+ s += 2;
+ break;
+ default:
+ return 0;
+ }
+ while (*s == '-' || isspace(*s))
+ s++;
+ }
+
+ // get year...
+ if (!isdigit(*s))
+ return 0;
+ year = 0;
+ while (isdigit(*s))
+ year = year * 10 + (*s++ - '0');
+ if (year < 69)
+ year += 2000;
+ else if (year < 1900)
+ year += 1900;
+ else if (year >= 19100) // seen some programs do it, why not check?
+ year -= (19100-2000);
+ while (*s == '-' || isspace(*s))
+ s++;
+
+ if (day < 0) { // still don't have day, so it's ISO8601 format
+ // get month...
+ if (!isdigit(*s))
+ return 0;
+ month = 0;
+ while (isdigit(*s))
+ month = month * 10 + (*s++ - '0');
+ if (month < 1 || month > 12)
+ return 0;
+ while (*s == '-' || isspace(*s))
+ s++;
+
+ // get day...
+ if (!isdigit(*s))
+ return 0;
+ day = 0;
+ while (isdigit(*s))
+ day = day * 10 + (*s++ - '0');
+ if (day < 1 || day > 31)
+ return 0;
+ while (*s == '-' || isspace(*s))
+ s++;
+ }
+
+ // optionally get hour...
+ hour = 0;
+ while (isdigit(*s))
+ hour = hour * 10 + (*s++ - '0');
+ if (hour > 23)
+ return 0;
+ while (*s == ':' || isspace(*s))
+ s++;
+
+ // optionally get minute...
+ minute = 0;
+ while (isdigit(*s))
+ minute = minute * 10 + (*s++ - '0');
+ if (minute > 59)
+ return 0;
+ while (*s == ':' || isspace(*s))
+ s++;
+
+ // optionally get second...
+ second = 0;
+ while (isdigit(*s))
+ second = second * 10 + (*s++ - '0');
+ if (second > 59)
+ return 0;
+ while (*s == ':' || isspace(*s))
+ s++;
+
+ // Assign the new value to time_t field
+ //
+ // Calculate date as seconds since 01 Jan 1970 00:00:00 GMT
+ // This is based somewhat on the date calculation code in NetBSD's
+ // cd9660_node.c code, for which I was unable to find a reference.
+ // It works, though!
+ //
+ Ht_t = (time_t) (((((367L*year - 7L*(year+(month+9)/12)/4
+ - 3L*(((year)+((month)+9)/12-1)/100+1)/4
+ + 275L*(month)/9 + day) -
+ (367L*EPOCH - 7L*(EPOCH+(1+9)/12)/4
+ - 3L*((EPOCH+(1+9)/12-1)/100+1)/4
+ + 275L*1/9 + 1))
+ * 24 + hour) * 60 + minute) * 60 + second);
+
+ // cerr << "Date string '" << date << "' converted to time_t "
+ // << (int)Ht_t << ", used " << (s-date) << " characters\n";
+
+ return s-date;
+}
+
+///////
+ // Personalized format such as C strftime function
+ // Overloaded version 1
+ // It ignores, for now, Time Zone values
+///////
+
+char *HtDateTime::SetFTime(const char *buf, const char *format)
+{
+
+ register char *p;
+ register int r;
+
+ ToGMTime(); // This must be set cos strptime always stores in GM
+
+ p = (char *) buf;
+ if (*format == '%') // skip any unexpected white space
+ while (isspace(*p))
+ p++;
+
+ // Special handling for LOOSE/SHORT formats...
+ if ((strcmp((char *) format, LOOSE_RFC850_FORMAT) == 0 ||
+ strcmp((char *) format, LOOSE_RFC1123_FORMAT) == 0 ||
+ strcmp((char *) format, ISO8601_SHORT_FORMAT) == 0) &&
+ (r = Parse(p)) > 0)
+ return p+r;
+
+ p = (char *) strptime (p, (char *) format, & Ht_tm);
+
+#ifdef TEST_HTDATETIME
+// ViewStructTM(& Ht_tm);
+#endif
+
+ // Assign the new value to time_t value
+ SetDateTime(Ht_tm);
+
+ return p;
+
+}
+
+
+///////
+ // C asctime() standard format
+///////
+
+void HtDateTime::SetAscTime(char *s)
+{
+
+ // Unfortunately, I cannot think of an easy test to
+ // see if we have a weekday *FIX*
+ SetFTime(s, ASCTIME_FORMAT);
+
+}
+
+///////
+ // RFC1123 standard Date format
+ // Sun, 06 Nov 1994 08:49:37 GMT
+///////
+
+void HtDateTime::SetRFC1123(char *s)
+{
+
+ // abbreviated weekday name;
+ // day of the month;
+ // abbreviated month name;
+ // year as ccyy;
+ // hour ( 00 - 23);
+ // minute ( 00 - 59);
+ // seconds ( 00 - 59);
+ // time zone name;
+
+ // First, if we have it, strip off the weekday
+ char *stripped;
+ stripped = strchr(s, ',');
+ if (stripped)
+ stripped++;
+ else
+ stripped = s;
+
+ SetFTime(stripped, LOOSE_RFC1123_FORMAT);
+
+}
+
+
+///////
+ // RFC850 standard Date format
+ // Sunday, 06-Nov-1994 08:49:37 GMT
+///////
+
+void HtDateTime::SetRFC850(char *s)
+{
+
+ // weekday name;
+ // day of the month;
+ // abbreviated month name;
+ // year within century;
+ // hour ( 00 - 23);
+ // minute ( 00 - 59);
+ // seconds ( 00 - 59);
+ // time zone name;
+
+ // First, if we have it, strip off the weekday
+ char *stripped;
+ stripped = strchr(s, ',');
+ if (stripped)
+ stripped++;
+ else
+ stripped = s;
+
+ SetFTime(stripped, LOOSE_RFC850_FORMAT);
+
+}
+
+
+///////
+ // ISO8601 standard Date format
+ // 1994-11-06 08:49:37 GMT
+///////
+
+void HtDateTime::SetISO8601(char *s)
+{
+
+ // year as ccyy;
+ // month ( 01 - 12)
+ // day of the month
+ // hour ( 00 - 23)
+ // minute ( 00 - 59)
+ // seconds ( 00 - 59);
+ // time zone name;
+
+ SetFTime(s, ISO8601_FORMAT);
+
+}
+
+
+///////
+ // Timestamp Date format (MySQL) without timezone
+ // 19941106084937
+///////
+
+void HtDateTime::SetTimeStamp(char *s)
+{
+
+ // year as ccyy;
+ // month ( 01 - 12)
+ // day of the month
+ // hour ( 00 - 23)
+ // minute ( 00 - 59)
+ // seconds ( 00 - 59);
+
+ SetFTime(s, TIMESTAMP_FORMAT);
+
+}
+
+
+///////
+ // Default date and time format for the locale
+///////
+
+void HtDateTime::SetDateTimeDefault(char *s)
+{
+
+ SetFTime(s, "%c");
+
+}
+
+
+
+
+/////// // Output Formats // ///////
+
+
+///////
+ // Personalized format such as C strftime function
+ // Overloaded version 1
+///////
+
+size_t HtDateTime::GetFTime(char *s, size_t max, const char *format) const
+{
+ // Refresh static struct tm variable
+
+ RefreshStructTM();
+
+ return strftime(s, max, format, & Ht_tm);
+
+}
+
+///////
+ // Personalized format such as C strftime function
+ // Overloaded version 2 - The best to be used outside
+ // for temporary uses
+///////
+
+char *HtDateTime::GetFTime(const char *format) const
+{
+
+ // Invoke GetFTime overloaded method
+
+ if(GetFTime(my_strtime, MAXSTRTIME, format))
+ return (char *)my_strtime;
+ else return 0;
+
+}
+
+///////
+ // RFC1123 standard Date format
+ // Sun, 06 Nov 1994 08:49:37 GMT
+///////
+
+char *HtDateTime::GetRFC1123() const
+{
+
+ // abbreviated weekday name;
+ // day of the month;
+ // abbreviated month name;
+ // year as ccyy;
+ // hour ( 00 - 23);
+ // minute ( 00 - 59);
+ // seconds ( 00 - 59);
+ // time zone name;
+
+ GetFTime(my_strtime, MAXSTRTIME, RFC1123_FORMAT);
+
+ return (char *)my_strtime;
+
+}
+
+///////
+ // RFC850 standard Date format
+ // Sunday, 06-Nov-94 08:49:37 GMT
+///////
+
+char *HtDateTime::GetRFC850() const
+{
+
+ // full weekday name
+ // day of the month
+ // abbreviated month name
+ // year within century ( 00 - 99 )
+ // hour ( 00 - 23)
+ // minute ( 00 - 59)
+ // seconds ( 00 - 59);
+ // time zone name;
+
+ GetFTime(my_strtime, MAXSTRTIME, RFC850_FORMAT);
+
+ return (char *)my_strtime;
+
+}
+
+///////
+ // C asctime() standard format
+///////
+
+char *HtDateTime::GetAscTime() const
+{
+
+ GetFTime(my_strtime, MAXSTRTIME, ASCTIME_FORMAT);
+ return (char *)my_strtime;
+
+}
+
+///////
+ // ISO8601 standard Date format
+ // 1994-11-06 08:49:37 GMT
+///////
+
+char *HtDateTime::GetISO8601() const
+{
+
+ // year as ccyy;
+ // month ( 01 - 12)
+ // day of the month
+ // hour ( 00 - 23)
+ // minute ( 00 - 59)
+ // seconds ( 00 - 59);
+ // time zone name;
+
+ GetFTime(my_strtime, MAXSTRTIME, ISO8601_FORMAT);
+
+ return (char *)my_strtime;
+
+}
+
+///////
+ // ISO8601 standard Date format
+ // 1994-11-06 08:49:37 GMT
+///////
+
+char *HtDateTime::GetShortISO8601() const
+{
+
+ // year as ccyy;
+ // month ( 01 - 12)
+ // day of the month
+
+ GetFTime(my_strtime, MAXSTRTIME, ISO8601_SHORT_FORMAT);
+
+ return (char *)my_strtime;
+
+}
+
+///////
+ // Timestamp Date format (MySQL) without timezone
+ // 19941106084937
+///////
+
+char *HtDateTime::GetTimeStamp() const
+{
+
+ // year as ccyy;
+ // month ( 01 - 12)
+ // day of the month
+ // hour ( 00 - 23)
+ // minute ( 00 - 59)
+ // seconds ( 00 - 59);
+
+ GetFTime(my_strtime, MAXSTRTIME, TIMESTAMP_FORMAT);
+
+ return (char *)my_strtime;
+
+}
+
+///////
+ // Default date and time format for the locale
+///////
+
+char *HtDateTime::GetDateTimeDefault() const
+{
+
+ GetFTime(my_strtime, MAXSTRTIME, "%c");
+
+ return (char *)my_strtime;
+
+}
+
+///////
+ // Default date format for the locale
+///////
+
+char *HtDateTime::GetDateDefault() const
+{
+
+ GetFTime(my_strtime, MAXSTRTIME, "%x");
+
+ return (char *)my_strtime;
+
+}
+
+///////
+ // Default time format for the locale
+///////
+
+char *HtDateTime::GetTimeDefault() const
+{
+
+ GetFTime(my_strtime, MAXSTRTIME, "%X");
+
+ return (char *)my_strtime;
+
+}
+
+
+
+///////
+ // Set the static struct tm depending on localtime status
+///////
+
+
+void HtDateTime::RefreshStructTM() const
+{
+
+ if(local_time)
+ // Setting localtime
+ memcpy(& Ht_tm, localtime(&Ht_t), sizeof(struct tm));
+ else
+ // Setting UTC or GM time
+ memcpy(& Ht_tm , gmtime(&Ht_t), sizeof(struct tm));
+
+}
+
+
+// Set the date time from a struct tm pointer
+
+void HtDateTime::SetDateTime(struct tm *ptm)
+{
+
+ if(local_time)
+ Ht_t = mktime(ptm); // Invoke mktime
+ else
+ Ht_t = HtTimeGM(ptm); // Invoke timegm alike function
+
+}
+
+
+// Set time to now
+
+void HtDateTime::SettoNow()
+{
+ Ht_t = time(0);
+}
+
+
+// Sets date by passing specific values
+// The values are reffered to the GM date time
+// Return false if failed
+
+bool HtDateTime::SetGMDateTime ( int year, int mon, int mday,
+ int hour, int min, int sec)
+{
+ struct tm tm_tmp;
+
+ // Year
+
+ if ( ! isAValidYear (year) ) return false;
+
+ if( year < 100)
+ year=Year_From2To4digits (year); // For further checks it's converted
+
+ // Assigning the year
+
+ tm_tmp.tm_year=year-1900;
+
+
+ // Month
+
+ if( ! isAValidMonth(mon) ) return false;
+
+ tm_tmp.tm_mon=mon-1; // Assigning the month to the structure
+
+
+ // Day
+
+ if ( ! isAValidDay ( mday, mon, year ) ) return false;
+
+ tm_tmp.tm_mday=mday; // Assigning the day of the month
+
+
+
+ if(hour >= 0 && hour < 24) tm_tmp.tm_hour = hour;
+ else return false;
+
+ if(min >= 0 && min < 60) tm_tmp.tm_min = min;
+ else return false;
+
+ if(sec >= 0 && sec < 60) tm_tmp.tm_sec = sec;
+ else return false;
+
+ tm_tmp.tm_yday = 0; // day of the year (to be ignored)
+ tm_tmp.tm_isdst = 0; // default for GM (to be ignored)
+
+ // Now we are going to insert the new values as time_t value
+ // This can only be done using GM Time and so ...
+
+ if (isLocalTime())
+ {
+ ToGMTime(); // Change to GM Time
+ SetDateTime(&tm_tmp); // commit it
+ ToLocalTime(); // And then return to Local Time
+ }
+ else SetDateTime(&tm_tmp); // only commit it
+
+ return true;
+
+}
+
+
+///////
+ // Gets a struct tm from the value stored in the object
+ // It's a protected method. Not visible outside the class
+///////
+
+struct tm &HtDateTime::GetStructTM() const
+{
+ RefreshStructTM(); // refresh it
+
+ return Ht_tm;
+}
+
+
+struct tm &HtDateTime::GetGMStructTM() const
+{
+ GetGMStructTM (Ht_tm);
+ return Ht_tm;
+}
+
+void HtDateTime::GetGMStructTM(struct tm & t) const
+{
+ // Directly gets gmtime value
+ memcpy(& t , gmtime(& Ht_t), sizeof(struct tm));
+}
+
+
+///////
+ // Is a leap year?
+///////
+
+bool HtDateTime::LeapYear (int y)
+{
+
+ if(y % 400 == 0 || ( y % 100 != 0 && y % 4 == 0))
+ return true; // a leap year
+ else
+ return false; // and not
+}
+
+
+///////
+ // Is a valid year number?
+///////
+
+bool HtDateTime::isAValidYear (int y)
+{
+
+ if(y >= 1970 && y < 2069) return true; // simple check and most likely
+
+ if(y >= 0 && y < 100) return true; // 2 digits year number
+
+ return false;
+
+}
+
+
+///////
+ // Is a valid month number?
+///////
+
+bool HtDateTime::isAValidMonth (int m)
+{
+
+ if( m >= 1 && m <= 12) return true;
+ else return false;
+
+}
+
+
+///////
+ // Is a valid day?
+///////
+
+bool HtDateTime::isAValidDay (int d, int m, int y)
+{
+
+ if ( ! isAValidYear (y) ) return false; // Checks for the year
+
+ if ( ! isAValidMonth (m) ) return false; // Checks for the month
+
+ if(m == 2)
+ {
+
+ // Expands the 2 digits year number
+ if ( y < 100 ) y=Year_From2To4digits(y);
+
+ if ( LeapYear (y) ) // Checks for the leap year
+ {
+ if (d >= 1 && d <= 29) return true;
+ else return false;
+ }
+ }
+
+ // Acts as default
+
+ if (d >= 1 && d <= days [m -1]) return true;
+ else return false;
+
+}
+
+
+///////
+ // Comparison methods
+///////
+
+
+int HtDateTime::DateTimeCompare (const HtDateTime & right) const
+{
+ int result;
+
+ // Let's compare the date
+
+ result=DateCompare(right);
+
+ if(result) return result;
+
+ // Same date. Let's compare the time
+
+ result=TimeCompare(right);
+
+ return result; // Nothing more to check
+
+}
+
+
+int HtDateTime::GMDateTimeCompare (const HtDateTime & right) const
+{
+ // We must compare the whole time_t value
+
+ if ( * this > right) return 1; // 1st greater than 2nd
+ if ( * this < right) return 1; // 1st lower than 2nd
+
+ return 0;
+
+}
+
+
+int HtDateTime::DateCompare (const HtDateTime & right) const
+{
+
+ // We must transform them in 2 struct tm variables
+
+ struct tm tm1, tm2;
+
+ this->GetGMStructTM (tm1);
+ right.GetGMStructTM (tm2);
+
+ // Let's compare them
+ return DateCompare (&tm1, &tm2);
+
+}
+
+
+int HtDateTime::GMDateCompare (const HtDateTime & right) const
+{
+
+ // We must transform them in 2 struct tm variables
+ // both referred to GM time
+
+ struct tm tm1, tm2;
+
+ this->GetGMStructTM (tm1);
+ right.GetGMStructTM (tm2);
+
+ // Let's compare them
+ return DateCompare (&tm1, &tm2);
+
+}
+
+
+int HtDateTime::TimeCompare (const HtDateTime & right) const
+{
+
+ // We must transform them in 2 struct tm variables
+
+ struct tm tm1, tm2;
+
+ this->GetStructTM (tm1);
+ right.GetStructTM (tm2);
+
+ return TimeCompare (&tm1, &tm2);
+
+}
+
+
+int HtDateTime::GMTimeCompare (const HtDateTime & right) const
+{
+
+ // We must transform them in 2 struct tm variables
+
+ struct tm tm1, tm2;
+
+ // We take the GM value of the time
+ this->GetGMStructTM (tm1);
+ right.GetGMStructTM (tm2);
+
+ return TimeCompare (&tm1, &tm2);
+
+}
+
+
+
+///////
+ // Static methods of comparison between 2 struct tm pointers
+///////
+
+
+///////
+ // Compares only the date (ignoring the time)
+///////
+
+int HtDateTime::DateCompare(const struct tm *tm1, const struct tm *tm2)
+{
+
+ // Let's check the year
+
+ if (tm1->tm_year < tm2->tm_year) return -1;
+ if (tm1->tm_year > tm2->tm_year) return 1;
+
+ // Same year. Let's check the month
+ if (tm1->tm_mon < tm2->tm_mon) return -1;
+ if (tm1->tm_mon > tm2->tm_mon) return 1;
+
+ // Same month. Let's check the day of the month
+
+ if (tm1->tm_mday < tm2->tm_mday) return -1;
+ if (tm1->tm_mday > tm2->tm_mday) return 1;
+
+ // They are equal for the date
+ return 0;
+}
+
+
+///////
+ // Compares only the time (ignoring the date)
+///////
+
+int HtDateTime::TimeCompare(const struct tm *tm1, const struct tm *tm2)
+{
+
+ // Let's check the hour
+
+ if (tm1->tm_hour < tm2->tm_hour) return -1;
+ if (tm1->tm_hour > tm2->tm_hour) return 1;
+
+ // Same hour . Let's check the minutes
+
+ if (tm1->tm_min < tm2->tm_min) return -1;
+ if (tm1->tm_min > tm2->tm_min) return 1;
+
+ // Ooops !!! Same minute. Let's check the seconds
+
+ if (tm1->tm_sec < tm2->tm_sec) return -1;
+ if (tm1->tm_sec > tm2->tm_sec) return 1;
+
+ // They are equal for the time
+ return 0;
+}
+
+
+///////
+ // Compares both date and time
+///////
+
+int HtDateTime::DateTimeCompare(const struct tm *tm1, const struct tm *tm2)
+{
+
+ int compare_date = DateCompare(tm1, tm2);
+
+ if(compare_date) return compare_date; // Different days
+
+ // We are in the same day. Let's check the time
+
+ int compare_time = TimeCompare(tm1, tm2);
+ if(compare_time) return compare_time; // Different time
+
+ // Equal
+ return 0;
+}
+
+time_t HtDateTime::HtTimeGM (struct tm *tm)
+{
+
+#if HAVE_TIMEGM
+ return timegm (tm);
+#else
+ return Httimegm (tm); // timegm replacement in timegm.c
+ // static time_t gmtime_offset;
+ // tm->tm_isdst = 0;
+ // return __mktime_internal (tm, gmtime, &gmtime_offset);
+#endif
+
+}
+
+
+
+// Returns the difference in seconds between two HtDateTime Objects
+
+int HtDateTime::GetDiff(const HtDateTime &d1, const HtDateTime &d2)
+{
+
+ return (int) ( d1.Ht_t - d2.Ht_t );
+
+}
+
+
+
+
+
+
+///////
+ // Only for test and debug
+///////
+
+#ifdef TEST_HTDATETIME
+
+
+///////
+ // View of struct tm fields
+///////
+
+void HtDateTime::ViewStructTM()
+{
+ // Default viewing: refresh depending on time_t value
+
+ RefreshStructTM(); // Refresh static variable
+
+ ViewStructTM(&Ht_tm);
+}
+
+void HtDateTime::ViewStructTM(struct tm *ptm)
+{
+
+ cout << "Struct TM fields" << endl;
+ cout << "================" << endl;
+ cout << "tm_sec :\t" << ptm->tm_sec << endl;
+ cout << "tm_min :\t" << ptm->tm_min << endl;
+ cout << "tm_hour :\t" << ptm->tm_hour << endl;
+ cout << "tm_mday :\t" << ptm->tm_mday << endl;
+ cout << "tm_mon :\t" << ptm->tm_mon << endl;
+ cout << "tm_year :\t" << ptm->tm_year << endl;
+ cout << "tm_wday :\t" << ptm->tm_wday << endl;
+ cout << "tm_yday :\t" << ptm->tm_yday << endl;
+ cout << "tm_isdst :\t" << ptm->tm_isdst<< endl;
+
+}
+
+
+
+
+int HtDateTime::Test(void)
+{
+
+ int ok=1;
+
+ const char *test_dates[] =
+ {
+ "1970.01.01 00:00:00",
+ "1970.01.01 00:00:01",
+ "1972.02.05 23:59:59",
+ "1972.02.28 00:59:59",
+ "1972.02.28 23:59:59",
+ "1972.02.29 00:00:00",
+ "1972.03.01 13:00:04",
+ "1973.03.01 12:00:00",
+ "1980.01.01 00:00:05",
+ "1984.12.31 23:00:00",
+ "1997.06.05 17:55:35",
+ "1999.12.31 23:00:00",
+ "2000.01.01 00:00:05",
+ "2000.02.28 23:00:05",
+ "2000.02.29 23:00:05",
+ "2000.03.01 00:00:05",
+ "2007.06.05 17:55:35",
+ "2038.01.19 03:14:07",
+ 0
+ };
+
+ const char *test_dates_ISO8601[] =
+ {
+ "1970-01-01 00:00:00 GMT",
+ "1970-01-01 00:00:00 CET",
+ "1990-02-27 23:30:20 GMT",
+ "1999-02-28 06:53:40 GMT",
+ "1975-04-27 06:53:40 CET",
+ 0
+ };
+
+ const char *test_dates_RFC1123[] =
+ {
+ "Sun, 06 Nov 1994 08:49:37 GMT",
+ "Sun, 25 Apr 1999 17:49:37 GMT",
+ "Sun, 25 Apr 1999 17:49:37 CET",
+ 0
+ };
+
+ const char *test_dates_RFC850[] =
+ {
+ "Sunday, 06-Nov-94 08:49:37 GMT",
+ "Sunday, 25-Apr-99 17:49:37 GMT",
+ "Sunday, 25-Apr-99 17:49:37 CET",
+ 0
+ };
+
+
+ const char myformat[]="%Y.%m.%d %H:%M:%S";
+
+ // Tests a personal format
+
+ cout << endl << "Beginning Test of a personal format such as "
+ << myformat << endl << endl;
+
+ if (Test((char **)test_dates, (const char *)myformat))
+ cout << "Test OK." << endl;
+ else
+ {
+ cout << "Test Failed." << endl;
+ ok=0;
+ }
+
+
+ // Tests ISO 8601 Format
+
+ cout << endl << "Beginning Test of ISO 8601 format" << endl << endl;
+
+ if(Test((char **)test_dates_ISO8601, (const char *)ISO8601_FORMAT))
+ cout << "Test OK." << endl;
+ else
+ {
+ cout << "Test Failed." << endl;
+ ok=0;
+ }
+
+
+ // Tests RFC 1123 Format
+
+ cout << endl << "Beginning Test of RFC 1123 format" << endl << endl;
+
+ if (Test((char **)test_dates_RFC1123, (const char *)RFC1123_FORMAT))
+ cout << "Test OK." << endl;
+ else
+ {
+ cout << "Test Failed." << endl;
+ ok=0;
+ }
+
+
+ // Tests RFC 850 Format
+
+ cout << endl << "Beginning Test of RFC 850 format" << endl << endl;
+
+ if (Test((char **)test_dates_RFC850, (const char *)RFC850_FORMAT))
+ cout << "Test OK." << endl;
+ else
+ {
+ cout << "Test Failed." << endl;
+ ok=0;
+ }
+
+
+ return(ok ? 1 : 0);
+
+}
+
+
+
+int HtDateTime::Test(char **test_dates, const char *format)
+{
+ int i, ok = 1;
+ HtDateTime orig, conv;
+
+ for (i = 0; (test_dates[i]); i++)
+ {
+
+ cout << "\t " << i+1 << "\tDate string parsing of:" << endl;
+ cout << "\t\t" << test_dates[i] << endl;
+ cout << "\t\tusing format: " << format << endl << endl;
+
+ orig.SetFTime(test_dates[i], format);
+
+ orig.ComparisonTest(conv);
+
+ conv=orig;
+
+ if (orig != conv)
+ {
+ cout << "HtDateTime test failed!" << endl;
+ cout << "\t Original : " << orig.GetRFC1123() << endl;
+ cout << "\t Converted: " << orig.GetRFC1123() << endl;
+ ok = 0;
+ }
+ else
+ {
+ orig.ToLocalTime();
+ cout << endl << "\t Localtime viewing" << endl;
+ orig.ViewFormats();
+ orig.ToGMTime();
+ cout << endl << "\t GMtime viewing" << endl;
+ orig.ViewFormats();
+ //orig.ViewStructTM();
+ }
+
+ cout << endl;
+
+ }
+
+ return ok;
+}
+
+
+void HtDateTime::ComparisonTest (const HtDateTime &right) const
+{
+ int result;
+
+
+ cout << "Comparison between:" << endl;
+
+ cout << " 1. " << this->GetRFC1123() << endl;
+ cout << " 2. " << right.GetRFC1123() << endl;
+ cout << endl;
+
+
+///////
+ // Complete comparison
+///////
+
+ cout << "\tComplete comparison (date and time)" << endl;
+ result = this->DateTimeCompare (right);
+
+ cout << "\t\t " << this->GetDateTimeDefault();
+
+ if (result > 0 )
+ cout << " is greater than ";
+ else if (result < 0 )
+ cout << " is lower than ";
+ else cout << " is equal to ";
+
+ cout << " " << right.GetDateTimeDefault() << endl;
+
+
+
+///////
+ // Date comparison
+///////
+
+ cout << "\tDate comparison (ignoring time)" << endl;
+ result = this->DateCompare (right);
+
+ cout << "\t\t " << this->GetDateDefault();
+
+ if (result > 0 )
+ cout << " is greater than ";
+ else if (result < 0 )
+ cout << " is lower than ";
+ else cout << " is equal to ";
+
+ cout << " " << right.GetDateDefault() << endl;
+
+
+///////
+ // Date comparison (after GM time conversion)
+///////
+
+ cout << "\tDate comparison (ignoring time) - GM time conversion" << endl;
+ result = this->GMDateCompare (right);
+
+ cout << "\t\t " << this->GetDateDefault();
+
+ if (result > 0 )
+ cout << " is greater than ";
+ else if (result < 0 )
+ cout << " is lower than ";
+ else cout << " is equal to ";
+
+ cout << " " << right.GetDateDefault() << endl;
+
+
+
+///////
+ // Time comparison
+///////
+
+ cout << "\tTime comparison (ignoring date)" << endl;
+ result = this->TimeCompare (right);
+
+ cout << "\t\t " << this->GetTimeDefault();
+
+ if (result > 0 )
+ cout << " is greater than ";
+ else if (result < 0 )
+ cout << " is lower than ";
+ else cout << " is equal to ";
+
+ cout << " " << right.GetTimeDefault() << endl;
+
+
+///////
+ // Time comparison (after GM time conversion)
+///////
+
+ cout << "\tTime comparison (ignoring date) - GM time conversion" << endl;
+ result = this->GMTimeCompare (right);
+
+ cout << "\t\t " << this->GetTimeDefault();
+
+ if (result > 0 )
+ cout << " is greater than ";
+ else if (result < 0 )
+ cout << " is lower than ";
+ else cout << " is equal to ";
+
+ cout << " " << right.GetTimeDefault() << endl;
+
+}
+
+
+
+void HtDateTime::ViewFormats()
+{
+
+ cout << "\t\t RFC 1123 Format : " << GetRFC1123() << endl;
+ cout << "\t\t RFC 850 Format : " << GetRFC850() << endl;
+ cout << "\t\t C Asctime Format: " << GetAscTime() << endl;
+ cout << "\t\t ISO 8601 Format : " << GetISO8601() << endl;
+
+}
+
+#endif
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