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Timestamps.cpp
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Timestamps.cpp
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/*
Timestamps.cpp - Library for getting both UNIX and NTP timestamps.
Created by Stefan Herzog, April 16 2020.
Released into the public domain.
*/
#include "Timestamps.h"
Timestamps::Timestamps(int timeZoneOffset) {
_timeZoneOffset = timeZoneOffset;
}
bool Timestamps::isLeapYear(unsigned int year) {
if (year % 4 == 0) {
if (year % 100 == 0) {
if (year % 400 == 0) {
return true;
}
else {
return false;
}
}
else {
return true;
}
}
else {
return false;
}
}
unsigned int Timestamps::getTimestamp(int referenceYear, int year, int month, int day, int hour, int minute, int second, int timeZoneOffset) {
unsigned int timestamp=0;
// Either use the time zone offset value from instantiating or the given paramter
/*
1. _timeZoneOffset is set AND timeZoneOffset is set -> use timeZoneOffset
2. _timeZoneOffset is set AND timeZoneOffset is NOT set -> use _timeZoneOffset
3. _timeZoneOffset is NOT set AND timeZoneOffset is set -> use timeZoneOffset
4. _timeZoneOffset is NOT set AND timeZoneOffset is NOT set -> use timeZoneOffset
*/
if(_timeZoneOffset != 0 && timeZoneOffset != 0) {
timeZoneOffset = timeZoneOffset;
}
else if(_timeZoneOffset != 0 && timeZoneOffset == 0) {
timeZoneOffset = _timeZoneOffset;
}
else if(_timeZoneOffset == 0 && timeZoneOffset != 0) {
timeZoneOffset = _timeZoneOffset;
}
else if(_timeZoneOffset == 0 && timeZoneOffset == 0) {
timeZoneOffset = timeZoneOffset;
}
else {
// ERROR
}
timestamp += timeZoneOffset;
//day <= 0 ? day=0 : day=day-1;
day <= 0 ? day=0 : day=day-1;
hour <= 0 ? hour=0 : hour=hour-1;
for(int y=referenceYear; y<year; y++) {
timestamp += 365*secondsPerDay;
if(isLeapYear(y)) {
// Year is leap year -> add one day to timestamp
timestamp += secondsPerDay;
}
}
for(int m=1; m<month; m++) {
timestamp += daysPerMonth[m-1] * secondsPerDay; // last month
}
if(isLeapYear(year) && month >= 3) {
// current year is leap year, so 29.02. exists
// Since we're in March now, add the 29.02. to the timestamp
timestamp += secondsPerDay; // 29.02.
}
timestamp += day * secondsPerDay; // time until yesterday evening / tonight 0:00
timestamp += hour * secondsPerHour;
timestamp += minute*60;
timestamp += second;
return timestamp;
}
unsigned int Timestamps::getTimestampUNIX(int year, int month, int day, int hour, int minute, int second, int timeZoneOffset) {
if(timeZoneOffset == 0) {
timeZoneOffset = _timeZoneOffset;
}
return getTimestamp(1970, year, month, day, hour, minute, second, timeZoneOffset);
}
unsigned int Timestamps::getTimestampNTP(int year, int month, int day, int hour, int minute, int second, int timeZoneOffset) {
if(timeZoneOffset == 0) {
timeZoneOffset = _timeZoneOffset;
}
return getTimestamp(1900, year, month, day, hour, minute, second, timeZoneOffset);
}
int* Timestamps::getDateFromTimestamp(int timestamp, int timeOffset, int referenceYear) {
int y = referenceYear; // this returns the current year. Default is referenceYear, which will be incremented.
int month = 0; // this returns the current month
timestamp += timeOffset;
while(timestamp/(365*secondsPerDay) > 0) {
timestamp -= 365*secondsPerDay;
if(isLeapYear(y)) {
// Year is leap year -> substract one more day
timestamp -= secondsPerDay;
}
y++;
}
formattedDate[0] = y;
for(int m=1; m<=12; m++) {
timestamp = timestamp - (daysPerMonth[m-1]*secondsPerDay);
if(timestamp - (daysPerMonth[m]*secondsPerDay) < 0) {
month = m+1;
break;
}
}
formattedDate[1] = month;
int d = timestamp/secondsPerDay;
timestamp = timestamp - d*secondsPerDay;
formattedDate[2] = d;
int h = timestamp/3600;
timestamp = timestamp - h*3600;
formattedDate[3] = h;
int m = timestamp / 60;
timestamp = timestamp - m*60;
formattedDate[4] = m;
int s = timestamp % 60;
formattedDate[5] = s;
return formattedDate;
}
// Returns year of given timestamp
int Timestamps::getYears(int timestamp, int timeOffset, int referenceYear) {
return getDateFromTimestamp(timestamp, timeOffset, referenceYear)[0];
}
// Returns month of given timestamp
int Timestamps::getMonths(int timestamp, int timeOffset, int referenceYear) {
return getDateFromTimestamp(timestamp, timeOffset, referenceYear)[1];
}
// Returns day of given timestamp
int Timestamps::getDays(int timestamp, int timeOffset, int referenceYear) {
return getDateFromTimestamp(timestamp, timeOffset, referenceYear)[2];
}
// Returns hours of given timestamp
int Timestamps::getHours(int timestamp, int timeOffset, int referenceYear) {
return getDateFromTimestamp(timestamp, timeOffset, referenceYear)[3];
}
// Returns minutes of given timestamp
int Timestamps::getMinutes(int timestamp, int timeOffset, int referenceYear) {
return getDateFromTimestamp(timestamp, timeOffset, referenceYear)[4];
}
// Returns seconds of given timestamp
int Timestamps::getSeconds(int timestamp, int timeOffset, int referenceYear) {
return getDateFromTimestamp(timestamp, timeOffset, referenceYear)[5];
}