diff --git a/lighthouse-plugin-ecoindex/cli/cli-flags.js b/lighthouse-plugin-ecoindex/cli/cli-flags.js
index def80cd0..d9ca980d 100644
--- a/lighthouse-plugin-ecoindex/cli/cli-flags.js
+++ b/lighthouse-plugin-ecoindex/cli/cli-flags.js
@@ -169,7 +169,7 @@ function getFlags(manualArgv, options = {}) {
   cliFlags['listAllAudits'] = false
 
   // Save results as reports.
-  cliFlags['generationDate'] = new Date().toISOString().replaceAll(':', '_')
+  cliFlags['generationDate'] = new Date().toISOString()
 
   // Prepare statements reports name
   // if (!cliFlags['input-report']) {
diff --git a/lighthouse-plugin-ecoindex/cli/commands.js b/lighthouse-plugin-ecoindex/cli/commands.js
index 23c6fc27..a1126f40 100644
--- a/lighthouse-plugin-ecoindex/cli/commands.js
+++ b/lighthouse-plugin-ecoindex/cli/commands.js
@@ -2,6 +2,7 @@ import * as constants from 'lighthouse/core/config/constants.js'
 
 import _slugify from 'slugify'
 import fs from 'fs'
+import { isDate } from 'util/types'
 import logSymbols from 'log-symbols'
 import path from 'path'
 
@@ -33,6 +34,13 @@ async function listAudits() {
   //   process.exit(0)
 }
 
+async function dateToFileString(date) {
+  if (isDate(date)) {
+    return date.toISOString().replace(/:/g, '-')
+  }
+  return date.replace(/:/g, '-')
+}
+
 /**
  * Read en config JSON file
  * @param {*} cliFlags
@@ -232,6 +240,7 @@ const slugify = children => {
 }
 
 export {
+  dateToFileString,
   endEcoindexPageMesure,
   getEnvStatementsObj,
   getLighthouseConfig,
diff --git a/lighthouse-plugin-ecoindex/cli/printer.js b/lighthouse-plugin-ecoindex/cli/printer.js
index 8a9e501a..b9c65035 100644
--- a/lighthouse-plugin-ecoindex/cli/printer.js
+++ b/lighthouse-plugin-ecoindex/cli/printer.js
@@ -1,5 +1,5 @@
+import { dateToFileString, getEnvStatementsObj, slugify } from './commands.js'
 import fs, { writeFileSync } from 'fs'
-import { getEnvStatementsObj, slugify } from './commands.js'
 import path, { dirname } from 'path'
 
 import Handlebars from 'handlebars'
@@ -28,7 +28,9 @@ Handlebars.registerHelper('ifEquals', function (arg1, arg2, options) {
  */
 async function preparareReports(cliFlags, course = undefined) {
   // Create the output folder if it doesn't exist.
-  let exportPath = `${cliFlags['output-path']}/${cliFlags['generationDate']}`
+  let exportPath = `${cliFlags['output-path']}/${await dateToFileString(
+    cliFlags['generationDate'],
+  )}`
 
   if (course) {
     await fs.mkdirSync(`${exportPath}/statements`, {