Updating Convert to handle dates properly for yaml and json

Fix bug with YAML & JSON with handling dates with 'new' and 'convert'

commands/convert.go

@@ -16,7 +16,9 @@ package commands
 import (
 	"fmt"
 	"path"
+	"time"
 
+	"github.com/spf13/cast"
 	"github.com/spf13/cobra"
 	"github.com/spf13/hugo/hugolib"
 	"github.com/spf13/hugo/parser"
@@ -114,6 +116,18 @@ func convertContents(mark rune) (err error) {
 			return err
 		}
 
+		// better handling of dates in formats that don't have support for them
+		if mark == parser.FormatToLeadRune("json") || mark == parser.FormatToLeadRune("yaml") {
+			newmetadata := cast.ToStringMap(metadata)
+			for k, v := range newmetadata {
+				switch vv := v.(type) {
+				case time.Time:
+					newmetadata[k] = vv.Format(time.RFC3339)
+				}
+			}
+			metadata = newmetadata
+		}
+
 		page.Dir = file.Dir
 		page.SetSourceContent(psr.Content())
 		page.SetSourceMetaData(metadata, mark)