From 3b2a7d939ae1e73fb6ebc30854ef4a17cdd4854fc030d58d68f072c31a52abdd Mon Sep 17 00:00:00 2001
From: Sergey Matveev <stargrave@stargrave.org>
Date: Thu, 21 Nov 2024 13:25:37 +0300
Subject: [PATCH] Revised and corrected work with TAI64

---
 tyac/tyac.tcl | 81 +++++++++++++++++++++++++++------------------------
 1 file changed, 43 insertions(+), 38 deletions(-)

diff --git a/tyac/tyac.tcl b/tyac/tyac.tcl
index e2c1e8d..f40f0e4 100644
--- a/tyac/tyac.tcl
+++ b/tyac/tyac.tcl
@@ -156,46 +156,55 @@ proc BLOB {chunkLen v} {
     }
 }
 
+proc UTCFromISO {v} {
+    return [clock scan $v -format {%Y-%m-%d %H:%M:%S} -gmt 1]
+}
+
 variable Leapsecs {
-    1483228800
-    1435708800
-    1341100800
-    1230768000
-    1136073600
-    915148800
-    867715200
-    820454400
-    773020800
-    741484800
-    709948800
-    662688000
-    631152000
-    567993600
-    489024000
-    425865600
-    394329600
-    362793600
-    315532800
-    283996800
-    252460800
-    220924800
-    189302400
-    157766400
-    126230400
-    94694400
-    78796800
+    "1972-07"
+    "1973-01"
+    "1974-01"
+    "1975-01"
+    "1976-01"
+    "1977-01"
+    "1978-01"
+    "1979-01"
+    "1980-01"
+    "1981-07"
+    "1982-07"
+    "1983-07"
+    "1985-07"
+    "1988-01"
+    "1990-01"
+    "1991-01"
+    "1992-07"
+    "1993-07"
+    "1994-07"
+    "1996-01"
+    "1997-07"
+    "1999-01"
+    "2006-01"
+    "2009-01"
+    "2012-07"
+    "2015-07"
+    "2017-01"
+}
+for {set i 0} {$i < [llength $Leapsecs]} {incr i} {
+    set v [lindex $Leapsecs $i]
+    set v [UTCFromISO "$v-01 00:00:00"]
+    set v [expr {$v + 10 + $i}]
+    lset Leapsecs $i $v
 }
 
 proc toTAI64 {v} {
     variable Leapsecs
-    set diff 10
-    for {set i 0} {$i < [llength $Leapsecs]} {incr i} {
-        if {$v > [lindex $Leapsecs $i]} {
-            set diff [expr {$diff + [llength $Leapsecs] - $i}]
-            break
-        }
+    set i 0
+    for {} {$i < [llength $Leapsecs]} {incr i} {
+        if {$v < [lindex $Leapsecs $i]} { break }
     }
-    set v [expr {$v + 0x4000000000000000 + $diff}]
+    set v [expr {$v + 10 + $i}]
+    if {$v == [lindex $Leapsecs $i]} { incr v }
+    set v [expr {$v + 0x4000000000000000}]
     toBE 8 $v
 }
 
@@ -215,10 +224,6 @@ proc TAI64 {v {n 0} {a 0}} {
     }
 }
 
-proc UTCFromISO {v} {
-    return [clock scan $v -format {%Y-%m-%d %H:%M:%S} -gmt 1]
-}
-
 proc RAW {t v} {
     char $t
     add $v
-- 
2.48.1