Fix [00655c867e]: ClockGetdatefieldsObjCmd(): avoid signed integer overflow and platform-dependent behavior

1 files changed, 14 insertions, 0 deletions

diff --git a/tests/clock.test b/tests/clock.test
index 587828f..4b12d5c 100644
--- a/tests/clock.test
+++ b/tests/clock.test
@@ -18600,6 +18600,20 @@ test clock-7.9 {Julian Day, two values} {
     clock scan {2440588 2440589} -format {%J %J} -gmt true
 } 86400
 
+test clock-7.10 {Julian Day, negative amount} {
+    # Note: %J does not accept negative input;
+    # add negative amounts to Julian day 0 instead
+    set s0 [clock scan 0 -format %J -gmt true]
+    set J0 [scan [clock format $s0 -format %J -gmt true] %lld]
+    set s0m1d [clock add $s0 -1 days]
+    set s0m24h [clock add $s0 -24 hours]
+    set J0m24h [scan [clock format $s0m24h -format %J -gmt true] %lld]
+    set s0m1s [clock add $s0 -1 seconds]
+    set J0m1s [scan [clock format $s0m1s -format %J -gmt true] %lld]
+    list $s0m1d $s0m24h $J0m24h $s0m1s $J0m1s $s0 $J0 \
+	[::tcl::mathop::== $s0m1d $s0m24h] [::tcl::mathop::== $J0m24h $J0m1s]
+} [list -210866889600 -210866889600 -1 -210866803201 -1 -210866803200 0 1 1]
+
 # BEGIN testcases8
 
 # Test parsing of ccyymmdd