calendar.parser,robots: hhmm>timestamp -> hhmm>duration

Better to parse it as a duration because it is not a valid timestamp.

basis/calendar/parser/parser-tests.factor

@@ -44,6 +44,13 @@ IN: calendar.parser.tests
     time- 1 seconds before?
 ] unit-test
 
+! hhmm>duration
+{
+    T{ duration { hour 10 } { minute 20 } }
+} [
+    "1020" hhmm>duration
+] unit-test
+
 ! parse-rfc822-gmt-offset
 { T{ duration f 0 0 0 0 0 0 } } [
     "GMT" parse-rfc822-gmt-offset

basis/calendar/parser/parser.factor

@@ -27,11 +27,6 @@ ERROR: invalid-timestamp-format ;
 
 : read-sp ( -- token ) " " read-token ;
 
-: hhmm>timestamp ( hhmm -- timestamp )
-    [
-        0 0 0 read-00 read-00 0 instant <timestamp>
-    ] with-string-reader ;
-
 : signed-gmt-offset ( dt ch -- dt' )
     { { CHAR: + [ 1 ] } { CHAR: - [ -1 ] } } case time* ;
 
@@ -181,3 +176,7 @@ MACRO: attempt-all-quots ( quots -- quot )
 
 : ymd>timestamp ( str -- timestamp )
     [ (ymd>timestamp) ] with-string-reader ;
+
+! Duration parsing
+: hhmm>duration ( hhmm -- duration )
+    [ instant read-00 >>hour read-00 >>minute ] with-string-reader ;

extra/robots/robots-tests.factor

@@ -26,8 +26,8 @@ IN: robots.tests
             }
             { visit-time
                 {
-                    T{ timestamp { hour 2 } }
+                    T{ duration { hour 2 } }
-                    T{ timestamp { hour 5 } }
+                    T{ duration { hour 5 } }
                 }
             }
             { request-rate 1 }

extra/robots/robots.factor

@@ -63,7 +63,7 @@ visit-time request-rate crawl-delay unknowns ;
         { "crawl-delay" [ string>number >>crawl-delay ] }
         { "request-rate" [ string>number >>request-rate ] }
         {
-            "visit-time" [ "-" split1 [ hhmm>timestamp ] bi@ 2array
+            "visit-time" [ "-" split1 [ hhmm>duration ] bi@ 2array
             >>visit-time
         ] }
         [ pick unknowns>> push-at ]