1 files changed, 37 insertions, 0 deletions
diff --git a/services/blog/nuldoc-src/revision.ts b/services/blog/nuldoc-src/revision.ts
new file mode 100644
index 00000000..a22b6bc4
--- /dev/null
+++ b/services/blog/nuldoc-src/revision.ts
@@ -0,0 +1,37 @@
+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 function dateToRfc3339String(date: Date): string {
+  // 2021-01-01T12:00:00+00:00
+  // TODO: currently, time part is fixed to 00:00:00.
+  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}T00:00:00+09:00`;
+}
+
+export type Revision = {
+  number: number;
+  date: Date;
+  remark: string;
+  isInternal: boolean;
+};