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CWE-ou-minkata/Sources/Plasma/PubUtilLib/plUnifiedTime/plUnifiedTime.cpp

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/*==LICENSE==*
CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011 Cyan Worlds, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
You can contact Cyan Worlds, Inc. by email legal@cyan.com
or by snail mail at:
Cyan Worlds, Inc.
14617 N Newport Hwy
Mead, WA 99021
*==LICENSE==*/
#include <float.h>
#include "plUnifiedTime.h"
#include "hsStlUtils.h"
#include "hsWindows.h"
#if HS_BUILD_FOR_UNIX
#include <sys/time.h>
#include <unistd.h>
#endif
#if HS_BUILD_FOR_WIN32
#include <sys/timeb.h> // for timeb
#endif
#include "hsUtils.h"
#include <time.h>
#include "hsStream.h"
#if HS_BUILD_FOR_WIN32
//
// Converts Windows Time to Unified Time
//
#define MAGICWINDOWSOFFSET ((__int64)11644473600) // magic number, taken from Python Source
//
hsBool plUnifiedTime::SetFromWinFileTime(const FILETIME ft)
{
// FILETIME resolution seems to be 0.01 sec
__int64 ff,ffsecs;
ff = *(__int64*)(&ft);
ffsecs = ff/(__int64)10000000;
if (ffsecs >= MAGICWINDOWSOFFSET) // make sure we won't end up negatice
{
fSecs = (time_t)(ffsecs-MAGICWINDOWSOFFSET);
fMicros = (UInt32)(ff % 10000000)/10;
return true;
}
else
// before the UNIX Epoch
return false;
}
//
// Sets the unified time to the current UTC time
//
hsBool plUnifiedTime::SetToUTC()
{
FILETIME ft;
GetSystemTimeAsFileTime(&ft); /* 100 ns blocks since 01-Jan-1641 */
return SetFromWinFileTime(ft);
}
#elif HS_BUILD_FOR_UNIX
//
// Sets the unified time to the current UTC time
//
hsBool plUnifiedTime::SetToUTC()
{
struct timeval tv;
// get the secs and micros from Jan 1, 1970
int ret = gettimeofday(&tv, nil);
if (ret == 0)
{
fSecs = tv.tv_sec;
fMicros = tv.tv_usec;
return true;
}
else
{
return false;
}
}
#else
#error "Unified Time Not Implemented on this platform!"
#endif
struct tm * plUnifiedTime::IGetTime(const time_t * timer) const
{
struct tm * tm = nil;
switch (fMode)
{
case kGmt:
tm = gmtime(timer);
break;
default:
tm = localtime(timer);
}
if ( tm )
tm->tm_isdst = -1;
return tm;
}
plUnifiedTime::plUnifiedTime(plUnifiedTime_CtorNow,int mode)
{
SetMode((Mode)mode);
ToCurrentTime();
}
plUnifiedTime::plUnifiedTime(const timeval & tv)
: fMode(kGmt)
{
*this = tv;
}
plUnifiedTime::plUnifiedTime(int mode, const struct tm & src)
: fMode((Mode)mode)
{
*this = src;
}
plUnifiedTime::plUnifiedTime(time_t t)
: fMode(kGmt)
{
*this = t;
}
plUnifiedTime::plUnifiedTime(unsigned long t)
: fMode(kGmt)
{
*this = t;
}
plUnifiedTime::plUnifiedTime(int year, int month, int day, int hour, int min, int sec, unsigned long usec, int dst)
: fMode(kGmt)
{
SetTime(year,month,day,hour,min,sec,usec,dst);
}
plUnifiedTime::plUnifiedTime(int mode, const char * buf, const char * fmt)
: fMode((Mode)mode)
{
FromString(buf,fmt);
}
plUnifiedTime::plUnifiedTime(const plUnifiedTime & src)
: fMode(src.fMode)
{
*this = src;
}
plUnifiedTime::plUnifiedTime(const plUnifiedTime * src)
: fMode(src->fMode)
{
*this = *src;
}
plUnifiedTime plUnifiedTime::GetCurrentTime(Mode mode)
{
plUnifiedTime t;
t.SetMode(mode);
t.ToCurrentTime();
return t;
}
const plUnifiedTime & plUnifiedTime::operator=(const plUnifiedTime & src)
{
fSecs = src.fSecs;
fMicros = src.fMicros;
fMode = src.fMode;
return *this;
}
const plUnifiedTime & plUnifiedTime::operator=(const plUnifiedTime * src)
{
return operator=(*src);
}
const plUnifiedTime & plUnifiedTime::operator=(time_t src)
{
fSecs = src;
fMicros = 0;
return *this;
}
const plUnifiedTime & plUnifiedTime::operator=(unsigned long src)
{
fSecs = (time_t)src;
fMicros = 0;
return *this;
}
const plUnifiedTime & plUnifiedTime::operator=(const struct timeval & src)
{
fSecs = src.tv_sec;
fMicros = src.tv_usec;
return *this;
}
const plUnifiedTime & plUnifiedTime::operator=(const struct tm & src)
{
struct tm atm = src;
fSecs = mktime(&atm);
return *this;
}
void plUnifiedTime::SetSecsDouble(double secs)
{
hsAssert(secs>=0, "plUnifiedTime::SetSecsDouble negative time");
double x,y;
x = modf(secs,&y);
fSecs = (time_t)y;
fMicros = (UInt32)(x*1000000);
}
void plUnifiedTime::ToCurrentTime()
{
SetToUTC();
}
hsBool plUnifiedTime::SetGMTime(short year, short month, short day, short hour, short minute, short second, unsigned long usec, int dst)
{
if( !SetTime( year, month, day, hour, minute, second, usec, dst ) )
return false;
fSecs -= IGetLocalTimeZoneOffset();
fMode = kGmt;
return true;
}
hsBool plUnifiedTime::SetTime(short year, short month, short day, short hour, short minute, short second, unsigned long usec, int dst)
{
struct tm atm;
atm.tm_sec = second;
atm.tm_min = minute;
atm.tm_hour = hour;
atm.tm_mday = day;
atm.tm_mon = month - 1;
atm.tm_year = year - 1900;
atm.tm_isdst = dst;
fSecs = mktime(&atm);
if (fSecs == -1)
return false;
if (fMicros >= 1000000)
return false;
fMicros = usec;
fMode = kLocal;
return true;
}
hsBool plUnifiedTime::GetTime(short &year, short &month, short &day, short &hour, short &minute, short &second) const
{
struct tm* time = IGetTime(&fSecs);
if (!time)
return false;
year = time->tm_year+1900;
month = time->tm_mon+1;
day = time->tm_mday;
hour = time->tm_hour;
minute = time->tm_min;
second = time->tm_sec;
return true;
}
const char* plUnifiedTime::Print() const
{
static std::string s;
// short year, month, day, hour, minute, second;
// GetTime(year, month, day, hour, minute, second);
//
// xtl::format(s,"yr %d mo %d day %d hour %d min %d sec %d",
// year, month, day, hour, minute, second);
s = Format("%c");
return s.c_str();
}
const char* plUnifiedTime::PrintWMillis() const
{
static std::string s;
xtl::format(s,"%s,s:%lu,ms:%d",
Print(), (unsigned long)GetSecs(), GetMillis() );
return s.c_str();
}
struct tm * plUnifiedTime::GetTm(struct tm * ptm) const
{
if (ptm != nil)
{
*ptm = *IGetTime(&fSecs);
return ptm;
}
else
return IGetTime(&fSecs);
}
int plUnifiedTime::GetYear() const
{
return GetTm() ? GetTm()->tm_year + 1900 : 0;
}
int plUnifiedTime::GetMonth() const
{
return GetTm() ? GetTm()->tm_mon + 1 : 0;
}
int plUnifiedTime::GetDay() const
{
return GetTm() ? GetTm()->tm_mday : 0;
}
int plUnifiedTime::GetHour() const
{
return GetTm() ? GetTm()->tm_hour : 0;
}
int plUnifiedTime::GetMinute() const
{
return GetTm() ? GetTm()->tm_min : 0;
}
int plUnifiedTime::GetSecond() const
{
return GetTm() ? GetTm()->tm_sec : 0;
}
int plUnifiedTime::GetDayOfWeek() const
{
return GetTm() ? GetTm()->tm_wday : 0;
}
int plUnifiedTime::GetMillis() const
{
return fMicros/1000;
}
#pragma optimize( "g", off ) // disable global optimizations
double plUnifiedTime::GetSecsDouble() const
{
hsDoublePrecBegin
double ret = GetSecs() + GetMicros() / 1000000.0;
hsDoublePrecEnd
return ret;
}
#pragma optimize( "", on ) // restore optimizations to their defaults
void plUnifiedTime::Read(hsStream* s)
{
s->LogSubStreamStart("UnifiedTime");
UInt32 secs;
s->LogReadSwap(&secs,"Seconds");
fSecs = (time_t)secs;
s->LogReadSwap(&fMicros,"MicroSeconds");
s->LogSubStreamEnd();
// preserve fMode
}
void plUnifiedTime::Write(hsStream* s) const
{
s->WriteSwap((UInt32)fSecs);
s->WriteSwap(fMicros);
// preserve fMode
}
const plUnifiedTime & plUnifiedTime::operator-=(const plUnifiedTime & rhs)
{
// carry if needed
if ((*this).fMicros < rhs.fMicros)
{
(*this).fSecs--;
(*this).fMicros += 1000000;
}
(*this).fMicros -= rhs.fMicros;
(*this).fSecs -= rhs.fSecs;
return *this;
}
const plUnifiedTime & plUnifiedTime::operator+=(const plUnifiedTime & rhs)
{
(*this).fMicros += rhs.fMicros;
// carry if needed
if ((*this).fMicros >= 1000000)
{
(*this).fSecs++;
(*this).fMicros -= 1000000;
}
(*this).fSecs += rhs.fSecs;
return *this;
}
bool plUnifiedTime::operator==(const plUnifiedTime & rhs) const
{
return ((fSecs == rhs.fSecs) && (fMicros == rhs.fMicros));
}
bool plUnifiedTime::operator!=(const plUnifiedTime & rhs) const
{
return ((fSecs != rhs.fSecs) || (fMicros != rhs.fMicros));
}
bool plUnifiedTime::operator <(const plUnifiedTime & rhs) const
{
return ((fSecs < rhs.fSecs) || ((fSecs == rhs.fSecs) && (fMicros < rhs.fMicros)));
}
bool plUnifiedTime::operator >(const plUnifiedTime & rhs) const
{
return ((fSecs > rhs.fSecs) || ((fSecs == rhs.fSecs) && (fMicros > rhs.fMicros)));
}
bool plUnifiedTime::operator<=(const plUnifiedTime & rhs) const
{
return (*this<rhs) || (*this==rhs);
}
bool plUnifiedTime::operator>=(const plUnifiedTime & rhs) const
{
return (*this>rhs) || (*this==rhs);
}
plUnifiedTime::operator timeval() const
{
#if HS_BUILD_FOR_WIN32
// tv_secs should be a time_t, but on Windows it is a long
struct timeval t = {(long)fSecs, (long)fMicros};
#else
struct timeval t = {fSecs, fMicros};
#endif
return t;
}
plUnifiedTime::operator struct tm() const
{
return *GetTm();
}
std::string plUnifiedTime::Format(const char * fmt) const
{
char buf[128];
struct tm * t = IGetTime(&fSecs);
if (t == nil ||
!strftime(buf, sizeof(buf), fmt, t))
buf[0] = '\0';
return std::string(buf);
}
plUnifiedTime operator -(const plUnifiedTime & left, const plUnifiedTime & right)
{
plUnifiedTime ans = left;
ans -= right;
return ans;
}
plUnifiedTime operator +(const plUnifiedTime & left, const plUnifiedTime & right)
{
plUnifiedTime ans = left;
ans += right;
return ans;
}
bool operator <(const plUnifiedTime & time, int secs)
{
return (time.GetSecs()<secs);
}
////////////////////////////////////////////////////////////////////
// FromString
#if !defined(HS_BUILD_FOR_UNIX)
namespace pvt_strptime
{
//
// based on glibc's strptime
//
#define __isleap(year) \
((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
#define match_char(ch1, ch2) if (ch1 != ch2) return NULL
#define match_string(cs1, s2) \
(strnicmp((cs1), (s2), strlen (cs1)) ? 0 : ((s2) += strlen (cs1), 1))
#define get_number(from, to, n) \
do { \
int __n = n; \
val = 0; \
while (*rp == ' ') \
++rp; \
if (*rp < '0' || *rp > '9') \
return NULL; \
do { \
val *= 10; \
val += *rp++ - '0'; \
} while (--__n > 0 && val * 10 <= to && *rp >= '0' && *rp <= '9'); \
if (val < from || val > to) \
return NULL; \
} while (0)
#define recursive(new_fmt) \
(*(new_fmt) != '\0' \
&& (rp = strptime_internal (rp, (new_fmt), tm, mode)) != NULL)
static char const weekday_name[][10] =
{
"Sunday", "Monday", "Tuesday", "Wednesday",
"Thursday", "Friday", "Saturday"
};
static char const ab_weekday_name[][4] =
{
"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
};
static char const month_name[][10] =
{
"January", "February", "March", "April", "May", "June",
"July", "August", "September", "October", "November", "December"
};
static char const ab_month_name[][4] =
{
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
#define HERE_D_T_FMT "%m/%d/%y %H:%M:%S"
#define HERE_D_FMT "%m/%d/%y"
#define HERE_AM_STR "AM"
#define HERE_PM_STR "PM"
#define HERE_T_FMT_AMPM "%I:%M:%S %p"
#define HERE_T_FMT "%H:%M:%S"
const unsigned short int __mon_yday[2][13] =
{
/* Normal years. */
{ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
/* Leap years. */
{ 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
};
static struct tm *
time_r(
const time_t *t,
struct tm *tp,
int mode)
{
struct tm *l = 0;
switch (mode)
{
case plUnifiedTime::kGmt:
l = gmtime(t);
break;
default:
l = localtime(t);
}
if (! l)
return 0;
*tp = *l;
tp->tm_isdst = -1;
return tp;
}
/* Compute the day of the week. */
static void
day_of_the_week (struct tm *tm)
{
/* We know that January 1st 1970 was a Thursday (= 4). Compute the
the difference between this data in the one on TM and so determine
the weekday. */
int corr_year = 1900 + tm->tm_year - (tm->tm_mon < 2);
int wday = (-473
+ (365 * (tm->tm_year - 70))
+ (corr_year / 4)
- ((corr_year / 4) / 25) + ((corr_year / 4) % 25 < 0)
+ (((corr_year / 4) / 25) / 4)
+ __mon_yday[0][tm->tm_mon]
+ tm->tm_mday - 1);
tm->tm_wday = ((wday % 7) + 7) % 7;
}
/* Compute the day of the year. */
static void
day_of_the_year (struct tm *tm)
{
tm->tm_yday = (__mon_yday[__isleap (1900 + tm->tm_year)][tm->tm_mon]
+ (tm->tm_mday - 1));
}
static char * strptime_internal(
const char * rp,
const char * fmt,
struct tm * tm,
int mode)
{
const char *rp_backup;
int cnt;
size_t val;
int have_I, is_pm;
int century, want_century;
int have_wday, want_xday;
int have_yday;
int have_mon, have_mday;
have_I = is_pm = 0;
century = -1;
want_century = 0;
have_wday = want_xday = have_yday = have_mon = have_mday = 0;
while (*fmt != '\0')
{
/* A white space in the format string matches 0 more or white
space in the input string. */
if (isspace (*fmt))
{
while (isspace (*rp))
++rp;
++fmt;
continue;
}
/* Any character but `%' must be matched by the same character
in the iput string. */
if (*fmt != '%')
{
match_char (*fmt++, *rp++);
continue;
}
++fmt;
/* We need this for handling the `E' modifier. */
start_over:
/* Make back up of current processing pointer. */
rp_backup = rp;
switch (*fmt++)
{
case '%':
/* Match the `%' character itself. */
match_char ('%', *rp++);
break;
case 'a':
case 'A':
/* Match day of week. */
for (cnt = 0; cnt < 7; ++cnt)
{
if (match_string (weekday_name[cnt], rp)
|| match_string (ab_weekday_name[cnt], rp))
{
break;
}
}
if (cnt == 7)
/* Does not match a weekday name. */
return NULL;
tm->tm_wday = cnt;
have_wday = 1;
break;
case 'b':
case 'B':
case 'h':
/* Match month name. */
for (cnt = 0; cnt < 12; ++cnt)
{
if (match_string (month_name[cnt], rp)
|| match_string (ab_month_name[cnt], rp))
{
break;
}
}
if (cnt == 12)
/* Does not match a month name. */
return NULL;
tm->tm_mon = cnt;
want_xday = 1;
break;
case 'c':
/* Match locale's date and time format. */
if (!recursive (HERE_D_T_FMT))
return NULL;
want_xday = 1;
break;
case 'C':
/* Match century number. */
get_number (0, 99, 2);
century = val;
want_xday = 1;
break;
case 'd':
case 'e':
/* Match day of month. */
get_number (1, 31, 2);
tm->tm_mday = val;
have_mday = 1;
want_xday = 1;
break;
case 'F':
if (!recursive ("%Y-%m-%d"))
return NULL;
want_xday = 1;
break;
case 'x':
/* Fall through. */
case 'D':
/* Match standard day format. */
if (!recursive (HERE_D_FMT))
return NULL;
want_xday = 1;
break;
case 'k':
case 'H':
/* Match hour in 24-hour clock. */
get_number (0, 23, 2);
tm->tm_hour = val;
have_I = 0;
break;
case 'I':
/* Match hour in 12-hour clock. */
get_number (1, 12, 2);
tm->tm_hour = val % 12;
have_I = 1;
break;
case 'j':
/* Match day number of year. */
get_number (1, 366, 3);
tm->tm_yday = val - 1;
have_yday = 1;
break;
case 'm':
/* Match number of month. */
get_number (1, 12, 2);
tm->tm_mon = val - 1;
have_mon = 1;
want_xday = 1;
break;
case 'M':
/* Match minute. */
get_number (0, 59, 2);
tm->tm_min = val;
break;
case 'n':
case 't':
/* Match any white space. */
while (isspace (*rp))
++rp;
break;
case 'p':
/* Match locale's equivalent of AM/PM. */
if (!match_string (HERE_AM_STR, rp))
if (match_string (HERE_PM_STR, rp))
is_pm = 1;
else
return NULL;
break;
case 'r':
if (!recursive (HERE_T_FMT_AMPM))
return NULL;
break;
case 'R':
if (!recursive ("%H:%M"))
return NULL;
break;
case 's':
{
/* The number of seconds may be very high so we cannot use
the `get_number' macro. Instead read the number
character for character and construct the result while
doing this. */
time_t secs = 0;
if (*rp < '0' || *rp > '9')
/* We need at least one digit. */
return NULL;
do
{
secs *= 10;
secs += *rp++ - '0';
}
while (*rp >= '0' && *rp <= '9');
if (time_r (&secs, tm, mode) == NULL)
/* Error in function. */
return NULL;
}
break;
case 'S':
get_number (0, 61, 2);
tm->tm_sec = val;
break;
case 'X':
/* Fall through. */
case 'T':
if (!recursive (HERE_T_FMT))
return NULL;
break;
case 'u':
get_number (1, 7, 1);
tm->tm_wday = val % 7;
have_wday = 1;
break;
case 'g':
get_number (0, 99, 2);
/* XXX This cannot determine any field in TM. */
break;
case 'G':
if (*rp < '0' || *rp > '9')
return NULL;
/* XXX Ignore the number since we would need some more
information to compute a real date. */
do
++rp;
while (*rp >= '0' && *rp <= '9');
break;
case 'U':
case 'V':
case 'W':
get_number (0, 53, 2);
/* XXX This cannot determine any field in TM without some
information. */
break;
case 'w':
/* Match number of weekday. */
get_number (0, 6, 1);
tm->tm_wday = val;
have_wday = 1;
break;
case 'y':
/* Match year within century. */
get_number (0, 99, 2);
/* The "Year 2000: The Millennium Rollover" paper suggests that
values in the range 69-99 refer to the twentieth century. */
tm->tm_year = val >= 69 ? val : val + 100;
/* Indicate that we want to use the century, if specified. */
want_century = 1;
want_xday = 1;
break;
case 'Y':
/* Match year including century number. */
get_number (0, 9999, 4);
tm->tm_year = val - 1900;
want_century = 0;
want_xday = 1;
break;
goto start_over;
case 'O':
switch (*fmt++)
{
case 'd':
case 'e':
/* Match day of month using alternate numeric symbols. */
get_number (1, 31, 2);
tm->tm_mday = val;
have_mday = 1;
want_xday = 1;
break;
case 'H':
/* Match hour in 24-hour clock using alternate numeric
symbols. */
get_number (0, 23, 2);
tm->tm_hour = val;
have_I = 0;
break;
case 'I':
/* Match hour in 12-hour clock using alternate numeric
symbols. */
get_number (1, 12, 2);
tm->tm_hour = val - 1;
have_I = 1;
break;
case 'm':
/* Match month using alternate numeric symbols. */
get_number (1, 12, 2);
tm->tm_mon = val - 1;
have_mon = 1;
want_xday = 1;
break;
case 'M':
/* Match minutes using alternate numeric symbols. */
get_number (0, 59, 2);
tm->tm_min = val;
break;
case 'S':
/* Match seconds using alternate numeric symbols. */
get_number (0, 61, 2);
tm->tm_sec = val;
break;
case 'U':
case 'V':
case 'W':
get_number (0, 53, 2);
/* XXX This cannot determine any field in TM without
further information. */
break;
case 'w':
/* Match number of weekday using alternate numeric symbols. */
get_number (0, 6, 1);
tm->tm_wday = val;
have_wday = 1;
break;
case 'y':
/* Match year within century using alternate numeric symbols. */
get_number (0, 99, 2);
tm->tm_year = val >= 69 ? val : val + 100;
want_xday = 1;
break;
default:
return NULL;
}
break;
default:
return NULL;
}
}
if (have_I && is_pm)
tm->tm_hour += 12;
if (century != -1)
{
if (want_century)
tm->tm_year = tm->tm_year % 100 + (century - 19) * 100;
else
/* Only the century, but not the year. Strange, but so be it. */
tm->tm_year = (century - 19) * 100;
}
if (want_xday && !have_wday)
{
if ( !(have_mon && have_mday) && have_yday)
{
/* We don't have tm_mon and/or tm_mday, compute them. */
int t_mon = 0;
while (__mon_yday[__isleap(1900 + tm->tm_year)][t_mon] <= tm->tm_yday)
t_mon++;
if (!have_mon)
tm->tm_mon = t_mon - 1;
if (!have_mday)
tm->tm_mday =
(tm->tm_yday
- __mon_yday[__isleap(1900 + tm->tm_year)][t_mon - 1] + 1);
}
day_of_the_week (tm);
}
if (want_xday && !have_yday)
day_of_the_year (tm);
return (char *) rp;
}
} // namespace pvt_strptime
#endif
bool plUnifiedTime::FromString(const char * buf, const char * fmt)
{
struct tm tm;
tm.tm_isdst = -1;
#if !defined(HS_BUILD_FOR_UNIX)
bool result = (pvt_strptime::strptime_internal(buf, fmt, &tm, fMode)!=nil);
#else
bool result = (strptime(buf, fmt, &tm)!=nil);
#endif
if (result)
*this = tm;
return result;
}
/// Local time zone offset stuff
Int32 plUnifiedTime::fLocalTimeZoneOffset = -1;
Int32 plUnifiedTime::IGetLocalTimeZoneOffset( void )
{
static bool inited = false;
if( !inited )
{
inited = true;
// Calculate the difference between local time and GMT for this system currently
// Taken from devx.com from an article written by Danny Kalev
// http://gethelp.devx.com/techtips/cpp_pro/10min/2001/10min1200-3.asp
time_t currLocalTime = time( 0 ); // current local time
struct tm local = *gmtime( &currLocalTime ); // convert curr to GMT, store as tm
time_t utc = mktime( &local ); // convert GMT tm to GMT time_t
double diffInSecs = difftime( utc, currLocalTime );
fLocalTimeZoneOffset = (Int32)diffInSecs;
}
return fLocalTimeZoneOffset;
}
//
// static helper, return difference timeA-timeB, may be negative
//
double plUnifiedTime::GetTimeDifference(const plUnifiedTime& timeA, const plUnifiedTime& timeB)
{
bool neg = (timeB > timeA);
plUnifiedTime timeDiff = neg ? (timeB - timeA) : (timeA - timeB); // always positive
double t = (float)(neg ? timeDiff.GetSecsDouble() * -1. : timeDiff.GetSecsDouble());
return t;
}