Never return a year < 1990 from trigger()

man/remind.1.in

@@ -4837,6 +4837,11 @@ Finally:
 .PP
 returns "30 November 1994 AT 22:00" for EST, which is 5 hours behind UTC.
 The value for your time zone may differ.
+.PP
+\fBtrigger()\fR will \fInever\fR return a date earlier than "1 January 1990"
+even if the UTC flag dictates that it should.  So do not use it for reminders
+before about 2 January 1990 in your local time zone.  I do not anticipate this
+restriction being a real problem.
 .RE
 .TP
 .B trigtags()

src/funcs.c

@@ -2179,6 +2179,9 @@ static int FTrigger(func_info *info)
             tim = ARGV(1);
             if (ARGV(2)) {
                 UTCToLocal(date, tim, &date, &tim);
+		if (date < 0) {
+		  date = 0;
+		}
             }
         } else if (Nargs > 1) {
             /* Date Time */
@@ -2193,6 +2196,9 @@ static int FTrigger(func_info *info)
             ASSERT_TYPE(1, INT_TYPE);
             if (ARGV(1)) {
                 UTCToLocal(date, tim, &date, &tim);
+		if (date < 0) {
+		  date = 0;
+		}
             }
         }
     }

tests/test.cmp

@@ -39472,6 +39472,7 @@ utctolocal(2051-01-01@04:44) => 2050-12-31@23:44
 utctolocal(2050-03-13@05:00) => 2050-03-13@00:00
 utctolocal(2050-11-06@04:00) => 2050-11-06@00:00
 utctolocal(2050-11-06@07:00) => 2050-11-06@02:00
+trigger(1990-01-01@01:22, 1) => "1 January 1990 AT 20:22"
 No reminders.
 -stdin-(9): `x' re-SET without being used (previous SET: -stdin-:8)
 -stdin-(11): `y' UNSET without being used (previous SET: -stdin-:10)

tests/yearfold.rem

@@ -34,3 +34,5 @@ set a utctolocal('2051-01-01@04:44')
 set a utctolocal('2050-03-13@05:00')
 set a utctolocal('2050-11-06@04:00')
 set a utctolocal('2050-11-06@07:00')
+
+set a trigger('1990-01-01@1:22', 1)