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/********************************************************************************
* *
* N T P - T i m e *
* *
*********************************************************************************
* Copyright (C) 2019,2022 by Jeroen van der Zijp. All Rights Reserved. *
*********************************************************************************
* This library is free software; you can redistribute it and/or modify *
* it under the terms of the GNU Lesser General Public License as published by *
* the Free Software Foundation; either version 3 of the License, or *
* (at your option) any later version. *
* *
* This library 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 Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public License *
* along with this program. If not, see <http://www.gnu.org/licenses/> *
********************************************************************************/
#include "xincs.h"
#include "fxver.h"
#include "fxdefs.h"
#include "fxmath.h"
#include "fxascii.h"
#include "FXString.h"
#include "FXSystem.h"
/*
Notes:
- Conversions between Network Time Protocol (NTP) time and Unix Epoch Time.
*/
using namespace FX;
/*******************************************************************************/
namespace FX {
// Offset from Epoch to 1-Jan-1900 @ 00:00:00 UTC
const FXTime JANUARY1900=-FXLONG(2208988800000000000);
// Offset from Epoch to 7-Feb-2036 @ 06:28:16 UTC
const FXTime FEBRUARY2036=+FXLONG(2085978496000000000);
// Convert NTP format (ssss:ffff) to nanoseconds since Unix Epoch
FXTime FXSystem::timeFromNTPTime(FXulong ntptime){
FXTime secs=(ntptime>>32)&0xFFFFFFFF;
FXTime frac=ntptime-(secs<<32);
FXTime nano=(frac*1000000000+2147483647)>>32;
return (secs&0x80000000) ? (secs*1000000000+nano+JANUARY1900) : (secs*1000000000+nano+FEBRUARY2036);
}
// Convert utc in nanoseconds since Unix Epoch to NTP (ssss:ffff)
FXulong FXSystem::ntpTimeFromTime(FXTime utc){
FXlong base=utc-FEBRUARY2036;
FXlong secs=(0<=base ? base : base-999999999)/1000000000;
FXlong nano=base-secs*1000000000;
FXlong frac=((nano<<32)+500000000)/1000000000;
return (secs<<32)+frac;
}
}
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