feat: implement unix to date converter (#184)

src/pages/tools/time/convert-unix-to-date/service.ts

@@ -0,0 +1,42 @@
+import { containsOnlyDigits } from '@utils/string';
+
+function computeUnixToDate(input: string, useLocalTime: boolean): string {
+  if (!containsOnlyDigits(input)) {
+    return '';
+  }
+  const timestamp = parseInt(input, 10);
+  const date = new Date(timestamp * 1000); // Convert from seconds to milliseconds
+
+  if (useLocalTime) {
+    const year = date.getFullYear();
+    const month = String(date.getMonth() + 1).padStart(2, '0');
+    const day = String(date.getDate()).padStart(2, '0');
+    const hours = String(date.getHours()).padStart(2, '0');
+    const minutes = String(date.getMinutes()).padStart(2, '0');
+    const seconds = String(date.getSeconds()).padStart(2, '0');
+    return `${year}-${month}-${day} ${hours}:${minutes}:${seconds}`;
+  } else {
+    return date.toISOString().replace('T', ' ').replace('Z', '');
+  }
+}
+
+export function convertUnixToDate(
+  input: string,
+  withLabel: boolean,
+  useLocalTime: boolean
+): string {
+  const result: string[] = [];
+
+  const lines = input.split('\n');
+
+  lines.forEach((line) => {
+    const parts = line.split(' ');
+    const timestamp = parts[0];
+    const formattedDate = computeUnixToDate(timestamp, useLocalTime);
+
+    const label = !useLocalTime && withLabel ? ' UTC' : '';
+    result.push(formattedDate ? `${formattedDate}${label}` : '');
+  });
+
+  return result.join('\n');
+}