diff --git a/libs/event-emitter/src/utils/timestamp-converter.ts b/libs/event-emitter/src/utils/timestamp-converter.ts
new file mode 100644
index 0000000..5a10f3d
--- /dev/null
+++ b/libs/event-emitter/src/utils/timestamp-converter.ts
@@ -0,0 +1,9 @@
+/* eslint-disable @typescript-eslint/no-namespace */
+export namespace TimestampConverter {
+  export function toTimestamp(date: string): number {
+    return new Date(date).getTime();
+  }
+  export function toString(date: number): string {
+    return new Date(date).toISOString();
+  }
+}
diff --git a/src/converters/redmine-public-url.converter.ts b/src/converters/redmine-public-url.converter.ts
new file mode 100644
index 0000000..1abf0b1
--- /dev/null
+++ b/src/converters/redmine-public-url.converter.ts
@@ -0,0 +1,17 @@
+import { Injectable } from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
+
+@Injectable()
+export class RedminePublicUrlConverter {
+  private redminePublicUrlPrefix: string;
+
+  constructor(private configService: ConfigService) {
+    this.redminePublicUrlPrefix = this.configService.get<string>(
+      'redmineIssueEventEmitterConfig.redmineUrlPublic',
+    );
+  }
+
+  convert(issueId: number | string): string {
+    return `${this.redminePublicUrlPrefix}/issues/${issueId}`;
+  }
+}