/proc/self/root/proc/thread-self/root/proc/self/task/15/root/usr/share/zoneinfo
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# ATOMIC TIME# Coordinated Universal Time (UTC) is the reference time scale derived# from The "Temps Atomique International" (TAI) calculated by the Bureau# International des Poids et Mesures (BIPM) using a worldwide network of atomic# clocks. UTC differs from TAI by an integer number of seconds; it is the basis# of all activities in the world.### ASTRONOMICAL TIME (UT1) is the time scale based on the rate of rotation of the earth.# It is now mainly derived from Very Long Baseline Interferometry (VLBI). The various# irregular fluctuations progressively detected in the rotation rate of the Earth led# in 1972 to the replacement of UT1 by UTC as the reference time scale.### LEAP SECOND# Atomic clocks are more stable than the rate of the earth's rotation since the latter# undergoes a full range of geophysical perturbations at various time scales: lunisolar# and core-mantle torques, atmospheric and oceanic effects, etc.# Leap seconds are needed to keep the two time scales in agreement, i.e. UT1-UTC smaller# than 0.9 seconds. Therefore, when necessary a "leap second" is applied to UTC.# Since the adoption of this system in 1972 it has been necessary to add a number of seconds to UTC,# firstly due to the initial choice of the value of the second (1/86400 mean solar day of# the year 1820) and secondly to the general slowing down of the Earth's rotation. It is# theoretically possible to have a negative leap second (a second removed from UTC), but so far,# all leap seconds have been positive (a second has been added to UTC). Based on what we know about# the earth's rotation, it is unlikely that we will ever have a negative leap second.### HISTORY# The first leap second was added on June 30, 1972. Until the year 2000, it was necessary in average to add a# leap second at a rate of 1 to 2 years. Since the year 2000 leap seconds are introduced with an# average interval of 3 to 4 years due to the acceleration of the Earth's rotation speed.### RESPONSIBILITY OF THE DECISION TO INTRODUCE A LEAP SECOND IN UTC# The decision to introduce a leap second in UTC is the responsibility of the Earth Orientation Center of# the International Earth Rotation and reference System Service (IERS). This center is located at Paris# Observatory. According to international agreements, leap seconds should be scheduled only for certain dates:# first preference is given to the end of December and June, and second preference at the end of March# and September. Since the introduction of leap seconds in 1972, only dates in June and December were used.## Questions or comments to:# Christian Bizouard: christian.bizouard@obspm.fr# Earth orientation Center of the IERS# Paris Observatory, France#### COPYRIGHT STATUS OF THIS FILE# This file is in the public domain.### VALIDITY OF THE FILE# It is important to express the validity of the file. These next two dates are# given in units of seconds since 1900.0.## 1) Last update of the file.## Updated through IERS Bulletin C (https://hpiers.obspm.fr/iers/bul/bulc/bulletinc.dat)## The following line shows the last update of this file in NTP timestamp:##$ 3976686858## 2) Expiration date of the file given on a semi-annual basis: last June or last December## File expires on 28 December 2026## Expire date in NTP timestamp:##@ 4007404800### LIST OF LEAP SECONDS# NTP timestamp (X parameter) is the number of seconds since 1900.0## MJD: The Modified Julian Day number. MJD = X/86400 + 15020## DTAI: The difference DTAI= TAI-UTC in units of seconds# It is the quantity to add to UTC to get the time in TAI## Day Month Year : epoch in clear##NTP Time DTAI Day Month Year#2272060800 10 # 1 Jan 19722287785600 11 # 1 Jul 19722303683200 12 # 1 Jan 19732335219200 13 # 1 Jan 19742366755200 14 # 1 Jan 19752398291200 15 # 1 Jan 19762429913600 16 # 1 Jan 19772461449600 17 # 1 Jan 19782492985600 18 # 1 Jan 19792524521600 19 # 1 Jan 19802571782400 20 # 1 Jul 19812603318400 21 # 1 Jul 19822634854400 22 # 1 Jul 19832698012800 23 # 1 Jul 19852776982400 24 # 1 Jan 19882840140800 25 # 1 Jan 19902871676800 26 # 1 Jan 19912918937600 27 # 1 Jul 19922950473600 28 # 1 Jul 19932982009600 29 # 1 Jul 19943029443200 30 # 1 Jan 19963076704000 31 # 1 Jul 19973124137600 32 # 1 Jan 19993345062400 33 # 1 Jan 20063439756800 34 # 1 Jan 20093550089600 35 # 1 Jul 20123644697600 36 # 1 Jul 20153692217600 37 # 1 Jan 2017## A hash code has been generated to be able to verify the integrity# of this file. For more information about using this hash code,# please see the readme file in the 'source' directory :# https://hpiers.obspm.fr/iers/bul/bulc/ntp/sources/README##h 2e101270 4e6749f8 2f1792b7 14a0c188 36bb19d6