diff --git a/src/date.ts b/src/date.ts
index 48c4c56..712efcb 100644
--- a/src/date.ts
+++ b/src/date.ts
@@ -58,7 +58,7 @@ export class TomlDate extends Date {
 				} else {
 					offset = match[3] || null
 					date = date.toUpperCase()
-					if (!offset) date += 'Z'
+					if (!offset && hasTime) date += 'Z'
 				}
 			} else {
 				date = ''