Define page.date

frontmatter/frontmatter.go

@@ -1,6 +1,7 @@
 package frontmatter
 
 import (
+	"fmt"
 	"reflect"
 	"sort"
 	"strings"
@@ -21,11 +22,22 @@ func (fm FrontMatter) Bool(k string, defaultValue bool) bool {
 	return defaultValue
 }
 
-// String returns m[k] if it's a string; else defaultValue.
+// Get returns m[k] if present; else defaultValue.
+func (fm FrontMatter) Get(k string, defaultValue interface{}) interface{} {
+	if val, found := fm[k]; found {
+		return val
+	}
+	return defaultValue
+}
+
+// String returns m[k] if it's a string or can be stringified; else defaultValue.
 func (fm FrontMatter) String(k string, defaultValue string) string {
 	if val, found := fm[k]; found {
-		if v, ok := val.(string); ok {
+		switch v := val.(type) {
+		case string:
 			return v
+		case fmt.Stringer:
+			return v.String()
 		}
 	}
 	return defaultValue

pages/drops.go

@@ -46,6 +46,7 @@ func (p *page) ToLiquid() interface{} {
 	)
 	data := map[string]interface{}{
 		"content": p.maybeContent(),
+		"date":    fm.Get("date", p.fileModTime),
 		"excerpt": p.Excerpt(),
 		"path":    relpath,
 		"url":     p.Permalink(),