Add corrupted time/seconds/date formats

Suggested by Isomer

.github/actions/spelling/line_forbidden.patterns

@@ -8,6 +8,15 @@
 # you might not want to check in code where you skip all the other tests.
 #\bfit\(
 
+# Should be `HH:MM:SS`
+\bHH:SS:MM\b
+
+# Should be `86400` (seconds in a standard day)
+\b84600\b(?:.*\bday\b)
+
+# Should probably be `2006-01-02` (yyyy-mm-dd)
+\b2006-01-02\b
+
 # Should be `anymore`
 \bany more[,.]