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import {LeapSecondInterface} from "../interfaces/leap.second.interface";
import {GorahyanInterface} from "../interfaces/gorahyan.interface";
export const leapProcessingConstants: LeapSecondInterface = {
// List of leap second timestamps from 1972-01-01 to 2017-01-01.
// These timestamps are in units of seconds since the NTP epoch, which is 1900-01-01 00:00:00,
// and it is assumed that the number of leap seconds always increases by 1 for each entry.
// Must be converted to JavaScript / Unix timestamps! deprecated source: https://www.ietf.org/timezones/data/leap-seconds.list
// New Source List: https://data.iana.org/time-zones/data/leap-seconds.list
leapSecondList: [
2272060800, 2287785600, 2303683200, 2335219200, 2366755200, 2398291200, 2429913600, 2461449600,
2492985600, 2524521600, 2571782400, 2603318400, 2634854400, 2698012800, 2776982400, 2840140800,
2871676800, 2918937600, 2950473600, 2982009600, 3029443200, 3076704000, 3124137600, 3345062400,
3439756800, 3550089600, 3644697600, 3692217600
],
leapSecondListEpoch: [],
leapSecondOffset: 10, // Ten Second Offset
leapDelta: "1900-01-01"
};
export function attachLeapSecondData() {
// convert LeapSecTimeStamps from NTP epoch (number of seconds since 1900-01-01 00:00:00)
// to JavaScript / Unix (number of milliseconds since 1970-01-01 00:00:00)
const { leapDelta, leapSecondList } = leapProcessingConstants;
let
buildList = leapProcessingConstants.leapSecondListEpoch.length === 0,
delta = Date.parse(leapDelta),
arrayLen = leapSecondList.length;
if(buildList) {
for (let i = 0; i < arrayLen; i += 1) {
let
epochConversion = Big(leapSecondList[i]).times(1000).plus(delta),
epochConversionAsNumber = epochConversion.toNumber(),
addEpochConversion = !leapProcessingConstants
.leapSecondListEpoch
.includes(epochConversionAsNumber);
if(addEpochConversion) {
leapProcessingConstants.leapSecondListEpoch
.push(epochConversionAsNumber);
}
}
}
return leapProcessingConstants;
}
export function adjustForLeapSeconds(timestampInMS: Big, gorahyan: GorahyanInterface) {
const { leapSecondListEpoch, leapSecondOffset } = gorahyan._leapSeconds;
let leapSecs = 0;
let arrayLen = leapSecondListEpoch.length;
const timestamp = timestampInMS.toNumber();
for(let i = 0; i < arrayLen && timestamp >= leapSecondListEpoch[i]; i++) {
leapSecs++;
}
if(leapSecs > 0) leapSecs += leapSecondOffset - 1;
let
adjustBy = Big(leapSecs).times(1000),
adjustedTimestamp = timestampInMS.plus(adjustBy);
return adjustedTimestamp.toNumber();
}
export function deAdjustForLeapSeconds(timestampInMS: Big, gorahyan: GorahyanInterface) {
// adjust a JavaScript timestamp for leap seconds
const { leapSecondListEpoch, leapSecondOffset } = gorahyan._leapSeconds;
let leapSecs = 0;
let arrayLen = leapSecondListEpoch.length;
const timestamp = timestampInMS.toNumber();
for(let i = 0; i < arrayLen && timestamp >= leapSecondListEpoch[i]; i++) {
leapSecs++;
}
if(leapSecs > 0) leapSecs += leapSecondOffset - 1;
let
adjustBy = Big(leapSecs).times(1000),
adjustedTimestamp = timestampInMS.minus(adjustBy);
return adjustedTimestamp.toNumber();
} |