1 files changed, 24 insertions, 2 deletions
diff --git a/nuldoc-src/revision.ts b/nuldoc-src/revision.ts
index 1757694..e04b7ba 100644
--- a/nuldoc-src/revision.ts
+++ b/nuldoc-src/revision.ts
@@ -1,5 +1,27 @@
+export type Date = {
+  year: number;
+  month: number;
+  day: number;
+};
+
+export function stringToDate(s: string): Date {
+  const match = s.match(/(\d{4})-(\d{2})-(\d{2})/);
+  if (match === null) {
+    throw new Error();
+  }
+  const [_, y, m, d] = match;
+  return { year: parseInt(y), month: parseInt(m), day: parseInt(d) };
+}
+
+export function dateToString(date: Date): string {
+  const y = `${date.year}`.padStart(4, "0");
+  const m = `${date.month}`.padStart(2, "0");
+  const d = `${date.day}`.padStart(2, "0");
+  return `${y}-${m}-${d}`;
+}
+
 export type Revision = {
   number: number;
-  date: string; // TODO
-  remark: string; // TODO: should it be markup text?
+  date: Date;
+  remark: string;
 };