Start adding TZ tests.

tests/test-timezone-support

@@ -0,0 +1,98 @@
+#!/bin/sh
+DIR=`dirname $0`
+cd $DIR
+if test $? != 0 ; then
+    echo ""
+    echo "Unable to cd $DIR" >&2
+    echo ""
+    exit 1
+fi
+
+if test `id -u` = 0 ; then
+    echo ""
+    echo "*** Please do not run the test suite as root; it will fail."
+    echo ""
+    exit 1
+fi
+
+# We alias "remind" here so that we don't inadvertently add code that
+# runs the system-installed verion of Remind rather than
+# ../src/remind.  This trick was suggested by Jochen Sprickerhof
+alias remind="echo You should be using ../src/remind explicitly in test-rem >&2; exit 1"
+
+REMIND="../src/remind -q --flush"
+OUT=../tests/tz.out
+CMP=../tests/tz.cmp
+
+echo -n "" > $OUT 2>&1
+
+TZ=Europe/Amsterdam $REMIND - 2025-09-03@14:00 <<'EOF' >> $OUT 2>&1
+SET $AddBlankLines=0
+BANNER %
+REM Fri AT 23:30 TZ America/Toronto +1000 SATISFY [$Td == 13] MSG Fri 13th @23:30 Eastern is %a %2 here
+SET a $T
+SET b $Tt
+MSG a = [a], b = [b]
+EOF
+
+TZ=Europe/Amsterdam $REMIND - 2026-02-14@14:00 <<'EOF' >> $OUT 2>&1
+SET $AddBlankLines=0
+BANNER %
+REM Fri AT 23:30 TZ America/Toronto +1000 SATISFY [$Td == 13] MSG Fri 13th @23:30 Eastern is %a %2 here
+SET a $T
+SET b $Tt
+MSG a = [a], b = [b]
+EOF
+
+TZ=Europe/Amsterdam $REMIND - 2026-02-15@14:00 <<'EOF' >> $OUT 2>&1
+SET $AddBlankLines=0
+BANNER %
+REM Fri AT 23:30 TZ America/Toronto +1000 SATISFY [$Td == 13] MSG Fri 13th @23:30 Eastern is %a %2 here
+SET a $T
+SET b $Tt
+MSG a = [a], b = [b]
+EOF
+
+TZ=America/Toronto $REMIND -p12 - 2025-01-01 <<'EOF' 2>&1 | grep Locally >> $OUT 2>&1
+REM Second Thursday AT 15:00 TZ Europe/Amsterdam MSG Locally: %3
+EOF
+
+TZ=America/Toronto $REMIND -g - 2026-01-01 <<'EOF' >> $OUT 2>&1
+BANNER %
+SET $AddBlankLines 0
+SET new   moondatetime(0)
+SET first moondatetime(1)
+SET full  moondatetime(2)
+SET last  moondatetime(3)
+
+REM [new]   +100 MSG New Moon      %*l %3.
+REM [first] +100 MSG First Quarter %*l %3.
+REM [full]  +100 MSG Full Moon     %*l %3.
+REM [last]  +100 MSG Last Quarter  %*l %3.
+
+SET new   tzconvert(new,   "America/Toronto", "Australia/Sydney")
+SET first tzconvert(first, "America/Toronto", "Australia/Sydney")
+SET full  tzconvert(full,  "America/Toronto", "Australia/Sydney")
+SET last  tzconvert(last,  "America/Toronto", "Australia/Sydney")
+
+REM [new]   +100 TZ Australia/Sydney MSG New Moon      %*l %3. (*)
+REM [first] +100 TZ Australia/Sydney MSG First Quarter %*l %3. (*)
+REM [full]  +100 TZ Australia/Sydney MSG Full Moon     %*l %3. (*)
+REM [last]  +100 TZ Australia/Sydney MSG Last Quarter  %*l %3. (*)
+
+EOF
+
+cmp -s $OUT $CMP
+if [ "$?" = "0" ] ; then
+    echo "Remind:  Time zone test PASSED"
+    exit 0
+else
+    echo "Remind:  Time zone test FAILED"
+    echo "Examine the file tz.out to see where it differs from the"
+    echo "reference file tz.cmp.  Here are the first 200 lines of"
+    echo "diff -u tz.out tz.cmp"
+    echo ""
+    diff -u $OUT $CMP | head -n 200
+    echo ""
+    exit 1
+fi