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Diffstat (limited to 'contrib/tzdata/leapseconds.awk')
-rw-r--r-- | contrib/tzdata/leapseconds.awk | 195 |
1 files changed, 155 insertions, 40 deletions
diff --git a/contrib/tzdata/leapseconds.awk b/contrib/tzdata/leapseconds.awk index 242e9d64098f..1fe50120afda 100644 --- a/contrib/tzdata/leapseconds.awk +++ b/contrib/tzdata/leapseconds.awk @@ -1,43 +1,59 @@ -# Generate the 'leapseconds' file from 'leap-seconds.list'. +# Generate zic format 'leapseconds' from NIST format 'leap-seconds.list'. # This file is in the public domain. +# This program uses awk arithmetic. POSIX requires awk to support +# exact integer arithmetic only through 10**10, which means for NTP +# timestamps this program works only to the year 2216, which is the +# year 1900 plus 10**10 seconds. However, in practice +# POSIX-conforming awk implementations invariably use IEEE-754 double +# and so support exact integers through 2**53. By the year 2216, +# POSIX will almost surely require at least 2**53 for awk, so for NTP +# timestamps this program should be good until the year 285,428,681 +# (the year 1900 plus 2**53 seconds). By then leap seconds will be +# long obsolete, as the Earth will likely slow down so much that +# there will be more than 25 hours per day and so some other scheme +# will be needed. + BEGIN { print "# Allowance for leap seconds added to each time zone file." print "" print "# This file is in the public domain." print "" print "# This file is generated automatically from the data in the public-domain" - print "# leap-seconds.list file, which can be copied from" + print "# NIST format leap-seconds.list file, which can be copied from" print "# <ftp://ftp.nist.gov/pub/time/leap-seconds.list>" - print "# or <ftp://ftp.boulder.nist.gov/pub/time/leap-seconds.list>" - print "# or <ftp://tycho.usno.navy.mil/pub/ntp/leap-seconds.list>." + print "# or <ftp://ftp.boulder.nist.gov/pub/time/leap-seconds.list>." print "# For more about leap-seconds.list, please see" print "# The NTP Timescale and Leap Seconds" print "# <https://www.eecis.udel.edu/~mills/leap.html>." print "" - print "# The International Earth Rotation and Reference Systems Service" + print "# The rules for leap seconds are specified in Annex 1 (Time scales) of:" + print "# Standard-frequency and time-signal emissions." + print "# International Telecommunication Union - Radiocommunication Sector" + print "# (ITU-R) Recommendation TF.460-6 (02/2002)" + print "# <https://www.itu.int/rec/R-REC-TF.460-6-200202-I/>." + print "# The International Earth Rotation and Reference Systems Service (IERS)" print "# periodically uses leap seconds to keep UTC to within 0.9 s of UT1" - print "# (which measures the true angular orientation of the earth in space)" + print "# (a proxy for Earth's angle in space as measured by astronomers)" print "# and publishes leap second data in a copyrighted file" print "# <https://hpiers.obspm.fr/iers/bul/bulc/Leap_Second.dat>." print "# See: Levine J. Coordinated Universal Time and the leap second." print "# URSI Radio Sci Bull. 2016;89(4):30-6. doi:10.23919/URSIRSB.2016.7909995" print "# <https://ieeexplore.ieee.org/document/7909995>." print "" - print "# There were no leap seconds before 1972, because the official mechanism" - print "# accounting for the discrepancy between atomic time and the earth's rotation" - print "# did not exist. The first (\"1 Jan 1972\") data line in leap-seconds.list" + print "# There were no leap seconds before 1972, as no official mechanism" + print "# accounted for the discrepancy between atomic time (TAI) and the earth's" + print "# rotation. The first (\"1 Jan 1972\") data line in leap-seconds.list" print "# does not denote a leap second; it denotes the start of the current definition" - print"# of UTC." - print "" - print "# The correction (+ or -) is made at the given time, so lines" - print "# will typically look like:" - print "# Leap YEAR MON DAY 23:59:60 + R/S" - print "# or" - print "# Leap YEAR MON DAY 23:59:59 - R/S" + print "# of UTC." print "" - print "# If the leap second is Rolling (R) the given time is local time (unused here)." + print "# All leap-seconds are Stationary (S) at the given UTC time." + print "# The correction (+ or -) is made at the given time, so in the unlikely" + print "# event of a negative leap second, a line would look like this:" + print "# Leap YEAR MON DAY 23:59:59 - S" + print "# Typical lines look like this:" + print "# Leap YEAR MON DAY 23:59:60 + S" monthabbr[ 1] = "Jan" monthabbr[ 2] = "Feb" @@ -51,45 +67,34 @@ BEGIN { monthabbr[10] = "Oct" monthabbr[11] = "Nov" monthabbr[12] = "Dec" - for (i in monthabbr) { - monthnum[monthabbr[i]] = i - monthlen[i] = 31 - } - monthlen[2] = 28 - monthlen[4] = monthlen[6] = monthlen[9] = monthlen[11] = 30 + + # Strip trailing CR, in case the input has CRLF form a la NIST. + RS = "\r?\n" + + sstamp_init() } -/^#\tUpdated through/ || /^#\tFile expires on:/ { +/^#[ \t]*[Uu]pdated through/ || /^#[ \t]*[Ff]ile expires on/ { last_lines = last_lines $0 "\n" } /^#[$][ \t]/ { updated = $2 } /^#[@][ \t]/ { expires = $2 } -/^#/ { next } +/^[ \t]*#/ { next } { NTP_timestamp = $1 TAI_minus_UTC = $2 - hash_mark = $3 - one = $4 - month = $5 - year = $6 if (old_TAI_minus_UTC) { if (old_TAI_minus_UTC < TAI_minus_UTC) { sign = "23:59:60\t+" } else { sign = "23:59:59\t-" } - m = monthnum[month] - 1 - if (m == 0) { - year--; - m = 12 - } - month = monthabbr[m] - day = monthlen[m] - day += m == 2 && year % 4 == 0 && (year % 100 != 0 || year % 400 == 0) - printf "Leap\t%s\t%s\t%s\t%s\tS\n", year, month, day, sign + sstamp_to_ymdhMs(NTP_timestamp - 1, ss_NTP) + printf "Leap\t%d\t%s\t%d\t%s\tS\n", \ + ss_year, monthabbr[ss_month], ss_mday, sign } old_TAI_minus_UTC = TAI_minus_UTC } @@ -102,7 +107,117 @@ END { print "" print "# POSIX timestamps for the data in this file:" - printf "#updated %s\n", updated - epoch_minus_NTP - printf "#expires %s\n", expires - epoch_minus_NTP + sstamp_to_ymdhMs(updated, ss_NTP) + printf "#updated %d (%.4d-%.2d-%.2d %.2d:%.2d:%.2d UTC)\n", \ + updated - epoch_minus_NTP, \ + ss_year, ss_month, ss_mday, ss_hour, ss_min, ss_sec + sstamp_to_ymdhMs(expires, ss_NTP) + printf "#expires %d (%.4d-%.2d-%.2d %.2d:%.2d:%.2d UTC)\n", \ + expires - epoch_minus_NTP, \ + ss_year, ss_month, ss_mday, ss_hour, ss_min, ss_sec + printf "\n%s", last_lines } + +# sstamp_to_ymdhMs - convert seconds timestamp to date and time +# +# Call as: +# +# sstamp_to_ymdhMs(sstamp, epoch_days) +# +# where: +# +# sstamp - is the seconds timestamp. +# epoch_days - is the timestamp epoch in Gregorian days since 1600-03-01. +# ss_NTP is appropriate for an NTP sstamp. +# +# Both arguments should be nonnegative integers. +# On return, the following variables are set based on sstamp: +# +# ss_year - Gregorian calendar year +# ss_month - month of the year (1-January to 12-December) +# ss_mday - day of the month (1-31) +# ss_hour - hour (0-23) +# ss_min - minute (0-59) +# ss_sec - second (0-59) +# ss_wday - day of week (0-Sunday to 6-Saturday) +# +# The function sstamp_init should be called prior to using sstamp_to_ymdhMs. + +function sstamp_init() +{ + # Days in month N, where March is month 0 and January month 10. + ss_mon_days[ 0] = 31 + ss_mon_days[ 1] = 30 + ss_mon_days[ 2] = 31 + ss_mon_days[ 3] = 30 + ss_mon_days[ 4] = 31 + ss_mon_days[ 5] = 31 + ss_mon_days[ 6] = 30 + ss_mon_days[ 7] = 31 + ss_mon_days[ 8] = 30 + ss_mon_days[ 9] = 31 + ss_mon_days[10] = 31 + + # Counts of days in a Gregorian year, quad-year, century, and quad-century. + ss_year_days = 365 + ss_quadyear_days = ss_year_days * 4 + 1 + ss_century_days = ss_quadyear_days * 25 - 1 + ss_quadcentury_days = ss_century_days * 4 + 1 + + # Standard day epochs, suitable for epoch_days. + # ss_MJD = 94493 + # ss_POSIX = 135080 + ss_NTP = 109513 +} + +function sstamp_to_ymdhMs(sstamp, epoch_days, \ + quadcentury, century, quadyear, year, month, day) +{ + ss_hour = int(sstamp / 3600) % 24 + ss_min = int(sstamp / 60) % 60 + ss_sec = sstamp % 60 + + # Start with a count of days since 1600-03-01 Gregorian. + day = epoch_days + int(sstamp / (24 * 60 * 60)) + + # Compute a year-month-day date with days of the month numbered + # 0-30, months (March-February) numbered 0-11, and years that start + # start March 1 and end after the last day of February. A quad-year + # starts on March 1 of a year evenly divisible by 4 and ends after + # the last day of February 4 years later. A century starts on and + # ends before March 1 in years evenly divisible by 100. + # A quad-century starts on and ends before March 1 in years divisible + # by 400. While the number of days in a quad-century is a constant, + # the number of days in each other time period can vary by 1. + # Any variation is in the last day of the time period (there might + # or might not be a February 29) where it is easy to deal with. + + quadcentury = int(day / ss_quadcentury_days) + day -= quadcentury * ss_quadcentury_days + ss_wday = (day + 3) % 7 + century = int(day / ss_century_days) + century -= century == 4 + day -= century * ss_century_days + quadyear = int(day / ss_quadyear_days) + day -= quadyear * ss_quadyear_days + year = int(day / ss_year_days) + year -= year == 4 + day -= year * ss_year_days + for (month = 0; month < 11; month++) { + if (day < ss_mon_days[month]) + break + day -= ss_mon_days[month] + } + + # Convert the date to a conventional day of month (1-31), + # month (1-12, January-December) and Gregorian year. + ss_mday = day + 1 + if (month <= 9) { + ss_month = month + 3 + } else { + ss_month = month - 9 + year++ + } + ss_year = 1600 + quadcentury * 400 + century * 100 + quadyear * 4 + year +} |