Handle more date formats

reader/date/parser.go

@@ -5,6 +5,7 @@
 package date
 
 import (
+	"errors"
 	"fmt"
 	"strings"
 	"time"
@@ -45,6 +46,8 @@ var dateFormats = []string{
 	"Monday, 02 January 2006 15:04:05 MST",
 	"Monday, 02 January 2006 15:04:05 -0700",
 	"Monday, 02 January 2006 15:04:05",
+	"Monday, January 02, 2006 - 3:04pm",
+	"Monday, January 2, 2006 - 3:04pm",
 	"Mon, 2 January 2006 15:04 MST",
 	"Mon, 2 January 2006, 15:04 -0700",
 	"Mon, 2 January 2006, 15:04:05 MST",
@@ -100,6 +103,7 @@ var dateFormats = []string{
 	"Mon, 02 Jan 2006 15:04:05",
 	"Mon, 02 Jan 2006",
 	"Mon, 02 Jan 06 15:04:05 MST",
+	"Mon, 02 Jan 2006 3:04 PM MST",
 	"January 2, 2006 3:04 PM",
 	"January 2, 2006, 3:04 p.m.",
 	"January 2, 2006 15:04:05 MST",
@@ -125,6 +129,7 @@ var dateFormats = []string{
 	"2 Jan 2006 15:04:05 MST",
 	"2 Jan 2006 15:04:05 -0700",
 	"2 Jan 2006",
+	"2 Jan 2006 15:04 MST",
 	"2.1.2006 15:04:05",
 	"2/1/2006",
 	"2-1-2006",
@@ -189,7 +194,7 @@ var dateFormats = []string{
 func Parse(ds string) (t time.Time, err error) {
 	d := strings.TrimSpace(ds)
 	if d == "" {
-		return t, fmt.Errorf("Date string is empty")
+		return t, errors.New("date parser: empty value")
 	}
 
 	for _, f := range dateFormats {
@@ -198,6 +203,6 @@ func Parse(ds string) (t time.Time, err error) {
 		}
 	}
 
-	err = fmt.Errorf("Failed to parse date: %s", ds)
+	err = fmt.Errorf(`date parser: failed to parse date "%s"`, ds)
 	return
 }

reader/date/parser_test.go

@@ -0,0 +1,56 @@
+// Copyright 2017 Frédéric Guillot. All rights reserved.
+// Use of this source code is governed by the Apache 2.0
+// license that can be found in the LICENSE file.
+
+package date
+
+import "testing"
+
+func TestParseEmptyDate(t *testing.T) {
+	if _, err := Parse("  "); err == nil {
+		t.Fatalf(`Empty dates should return an error`)
+	}
+}
+
+func TestParseInvalidDate(t *testing.T) {
+	if _, err := Parse("invalid"); err == nil {
+		t.Fatalf(`Invalid dates should return an error`)
+	}
+}
+
+func TestParseAtomDate(t *testing.T) {
+	date, err := Parse("2017-12-22T22:09:49+00:00")
+	if err != nil {
+		t.Fatalf(`Atom dates should be parsed correctly`)
+	}
+
+	if date.Unix() != 1513980589 {
+		t.Fatal(`Invalid date parsed`)
+	}
+}
+
+func TestParseRSSDate(t *testing.T) {
+	date, err := Parse("Tue, 03 Jun 2003 09:39:21 GMT")
+	if err != nil {
+		t.Fatalf(`RSS dates should be parsed correctly`)
+	}
+
+	if date.Unix() != 1054633161 {
+		t.Fatal(`Invalid date parsed`)
+	}
+}
+
+func TestParseWeirdDateFormat(t *testing.T) {
+	dates := []string{
+		"Sun, 17 Dec 2017 1:55 PM EST",
+		"9 Dec 2016 12:00 GMT",
+		"Friday, December 22, 2017 - 3:09pm",
+		"Friday, December 8, 2017 - 3:07pm",
+	}
+
+	for _, date := range dates {
+		if _, err := Parse(date); err != nil {
+			t.Fatalf(`Unable to parse date: "%s"`, date)
+		}
+	}
+}