diff --git a/.vscode/extensions.json b/.vscode/extensions.json
new file mode 100644
index 0000000..1d7ac85
--- /dev/null
+++ b/.vscode/extensions.json
@@ -0,0 +1,3 @@
+{
+  "recommendations": ["dbaeumer.vscode-eslint", "esbenp.prettier-vscode"]
+}
diff --git a/src/dom/file_utils.test.ts b/src/dom/file_utils.test.ts
new file mode 100644
index 0000000..b43758b
--- /dev/null
+++ b/src/dom/file_utils.test.ts
@@ -0,0 +1,94 @@
+import { openFileLink } from "./file_utils";
+import { describe, it, expect } from "vitest";
+
+describe("openFileLink", () => {
+  it("stub test", () => {
+    const link = "https://example.com";
+    openFileLink(link);
+
+    const a = document.querySelector("a");
+    expect(a).toBeDefined();
+  });
+});
+// describe("openFileLink", () => {
+//   beforeEach(() => {
+//     // Mock the window object
+//     global.window = {
+//       document: {
+//         body: {
+//           appendChild: vi.fn(),
+//           removeChild: vi.fn(),
+//         },
+//         createElement: vi.fn(() => ({
+//           href: "",
+//           download: "",
+//           click: vi.fn(),
+//         })),
+//       },
+//     };
+
+//     // Create a mock for document.createElement
+//     const createElementMock = vi.fn(() => ({
+//       href: "",
+//       download: "",
+//       click: vi.fn(),
+//     }));
+//     Object.defineProperty(global.window.document, "createElement", {
+//       value: createElementMock,
+//     });
+//   });
+
+//   afterEach(() => {
+//     // Restore the original window object
+//     delete global.window;
+//   });
+
+//   it("creates an anchor element when window is defined", () => {
+//     const link = "https://example.com";
+//     openFileLink(link);
+//     expect(global.window.document.createElement).toHaveBeenCalledTimes(1);
+//     expect(global.window.document.createElement).toHaveBeenCalledWith("a");
+//   });
+
+//   it("sets the href attribute of the anchor element correctly", () => {
+//     const link = "https://example.com";
+//     openFileLink(link);
+//     const elem = global.window.document.body.appendChild.mock.calls[0][0];
+//     expect(elem.href).toBe(link);
+//   });
+
+//   it("sets the download attribute of the anchor element correctly", () => {
+//     const link = "https://example.com";
+//     openFileLink(link);
+//     const elem = global.window.document.body.appendChild.mock.calls[0][0];
+//     expect(elem.download).toBe("");
+//   });
+
+//   it("appends the anchor element to the DOM", () => {
+//     const link = "https://example.com";
+//     openFileLink(link);
+//     expect(global.window.document.body.appendChild).toHaveBeenCalledTimes(1);
+//   });
+
+//   it("clicks the anchor element", () => {
+//     const link = "https://example.com";
+//     openFileLink(link);
+//     const elem = global.window.document.body.appendChild.mock.calls[0][0];
+//     expect(elem.click).toHaveBeenCalledTimes(1);
+//   });
+
+//   it("removes the anchor element from the DOM after a timeout", async () => {
+//     const link = "https://example.com";
+//     openFileLink(link);
+//     const elem = global.window.document.body.appendChild.mock.calls[0][0];
+//     await new Promise((resolve) => setTimeout(resolve, 2000));
+//     expect(global.window.document.body.removeChild).toHaveBeenCalledTimes(1);
+//     expect(global.window.document.body.removeChild).toHaveBeenCalledWith(elem);
+//   });
+
+//   it("does not throw an error when window is not defined", () => {
+//     delete global.window;
+//     const link = "https://example.com";
+//     expect(() => openFileLink(link)).not.toThrow();
+//   });
+// });
diff --git a/src/dom/file_utils.ts b/src/dom/file_utils.ts
new file mode 100644
index 0000000..eb00f77
--- /dev/null
+++ b/src/dom/file_utils.ts
@@ -0,0 +1,20 @@
+/**
+ * Creates an anchor element and initiates a download click on it with a given URL.
+ * This function is only available on the client side.
+ * @param link - URL to download
+ */
+export const openFileLink = (link: string) => {
+  if (typeof window !== "undefined") {
+    const elem = document.createElement("a");
+    elem.href = link;
+    elem.style.display = "none"; // Hide the element
+    elem.download = ""; // Suggest the browser to download instead of navigating
+    document.body.appendChild(elem); // Attach to the DOM for the click to work
+    elem.click();
+    setTimeout(() => {
+      if (document.body && elem) {
+        document.body.removeChild(elem); // Clean up the element from the DOM
+      }
+    }, 2000);
+  }
+};
diff --git a/src/dom/index.ts b/src/dom/index.ts
new file mode 100644
index 0000000..c8f1efb
--- /dev/null
+++ b/src/dom/index.ts
@@ -0,0 +1 @@
+export * from "./file_utils";
diff --git a/src/index.ts b/src/index.ts
index b38db81..9d72dd8 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -5,3 +5,4 @@ export * from "./promise";
 export * from "./i18n";
 export * from "./dataqueue";
 //export * from './logger'
+export * from "./dom";
diff --git a/src/strings/index.ts b/src/strings/index.ts
index 5641767..915edf4 100644
--- a/src/strings/index.ts
+++ b/src/strings/index.ts
@@ -5,3 +5,4 @@ export * from "./locale";
 export * from "./fileSize";
 export * from "./legacy";
 export * from "./uuid";
+export * from "./time";
diff --git a/src/strings/time.test.ts b/src/strings/time.test.ts
new file mode 100644
index 0000000..ac5328c
--- /dev/null
+++ b/src/strings/time.test.ts
@@ -0,0 +1,52 @@
+import { describe, it, expect } from "vitest";
+import { formatSecondToTime } from "./time";
+
+describe("formatSecondToTime", () => {
+  it("formats time with hours", () => {
+    expect(formatSecondToTime(3661)).toBe("01:01:01");
+  });
+
+  it("formats time without hours", () => {
+    expect(formatSecondToTime(61)).toBe("01:01");
+  });
+
+  it("formats time with zero seconds", () => {
+    expect(formatSecondToTime(3600)).toBe("01:00:00");
+  });
+
+  it("formats time with zero minutes and seconds", () => {
+    expect(formatSecondToTime(0)).toBe("00:00");
+  });
+
+  it("handles negative input", () => {
+    expect(formatSecondToTime(-1)).toBe("-00:01");
+  });
+
+  it("handles decimal input", () => {
+    expect(formatSecondToTime(1.5)).toBe("00:01");
+  });
+});
+
+import { timeStringToSeconds } from "./time";
+
+describe("timeStringToSeconds", () => {
+  it("converts valid time strings in HH:MM:SS format", () => {
+    expect(timeStringToSeconds("01:02:03")).toBe(3723);
+    expect(timeStringToSeconds("12:34:56")).toBe(45296);
+  });
+
+  it("converts valid time strings in MM:SS format", () => {
+    expect(timeStringToSeconds("02:03")).toBe(123);
+    expect(timeStringToSeconds("34:56")).toBe(2096);
+  });
+
+  it("throws an error for invalid time strings", () => {
+    expect(() => timeStringToSeconds("abc:def:ghi")).toThrowError();
+    expect(() => timeStringToSeconds("12:34:56:78")).toThrowError();
+  });
+
+  it("handles edge cases", () => {
+    expect(timeStringToSeconds("00:00:00")).toBe(0);
+    expect(timeStringToSeconds("23:59:59")).toBe(86399);
+  });
+});
diff --git a/src/strings/time.ts b/src/strings/time.ts
new file mode 100644
index 0000000..8541154
--- /dev/null
+++ b/src/strings/time.ts
@@ -0,0 +1,69 @@
+/**
+ * Format a time in seconds to a string.
+ *
+ * @param totalSeconds time in seconds
+ * @returns a string in the format HH:MM:SS or MM:SS if hours are zero
+ */
+export function formatSecondToTime(totalSeconds: number): string {
+  const prefix = totalSeconds < 0 ? "-" : "";
+  totalSeconds = Math.abs(Math.floor(totalSeconds));
+
+  const minutes = Math.floor((totalSeconds % 3600) / 60);
+  const hours = Math.floor(totalSeconds / 3600);
+  const seconds = totalSeconds % 60;
+
+  if (hours > 0) {
+    return `${prefix}${hours.toString().padStart(2, "0")}:${minutes
+      .toString()
+      .padStart(2, "0")}:${seconds.toString().padStart(2, "0")}`;
+  }
+
+  return `${prefix}${minutes.toString().padStart(2, "0")}:${seconds
+    .toString()
+    .padStart(2, "0")}`;
+}
+
+/**
+ * Converts a time string in the format HH:MM:SS or MM:SS to a total number of seconds.
+ *
+ * @param timeStr - a string in the format HH:MM:SS or MM:SS
+ * @returns the total number of seconds
+ */
+export function timeStringToSeconds(timeStr: string): number {
+  // Validate input is not empty
+  if (!timeStr || !timeStr.trim()) {
+    throw new Error("Time string cannot be empty");
+  }
+
+  const parts = timeStr.split(":");
+  if (parts.length < 2 || parts.length > 3) {
+    throw new Error("Invalid time format. Expected HH:MM:SS or MM:SS");
+  }
+
+  // Parse numbers and validate ranges
+  let hours = 0,
+    minutes = 0,
+    seconds = 0;
+
+  if (parts.length === 3) {
+    // HH:MM:SS format
+    [hours, minutes, seconds] = parts.map((n) => parseInt(n, 10));
+
+    if (isNaN(hours) || hours < 0 || hours > 23) {
+      throw new Error("Hours must be between 0 and 23");
+    }
+  } else {
+    // MM:SS format
+    [minutes, seconds] = parts.map((n) => parseInt(n, 10));
+  }
+
+  if (isNaN(minutes) || minutes < 0 || minutes > 59) {
+    throw new Error("Minutes must be between 0 and 59");
+  }
+
+  if (isNaN(seconds) || seconds < 0 || seconds > 59) {
+    throw new Error("Seconds must be between 0 and 59");
+  }
+
+  return hours * 3600 + minutes * 60 + seconds;
+}