diff --git a/epic-games.js b/epic-games.js
index 54ca597..5487445 100644
--- a/epic-games.js
+++ b/epic-games.js
@@ -25,7 +25,7 @@ const context = await firefox.launchPersistentContext(cfg.dir.browser, {
   // userAgent firefox (docker): Mozilla/5.0 (X11; Linux aarch64; rv:109.0) Gecko/20100101 Firefox/115.0
   locale: 'en-US', // ignore OS locale to be sure to have english text for locators
   recordVideo: cfg.record ? { dir: 'data/record/', size: { width: cfg.width, height: cfg.height } } : undefined, // will record a .webm video for each page navigated; without size, video would be scaled down to fit 800x800
-  recordHar: cfg.record ? { path: `data/record/eg-${datetime()}.har` } : undefined, // will record a HAR file with network requests and responses; can be imported in Chrome devtools
+  recordHar: cfg.record ? { path: `data/record/eg-${filenamify(datetime())}.har` } : undefined, // will record a HAR file with network requests and responses; can be imported in Chrome devtools
   handleSIGINT: false, // have to handle ourselves and call context.close(), otherwise recordings from above won't be saved
   // user settings for firefox have to be put in $BROWSER_DIR/user.js
   args: [ // https://wiki.mozilla.org/Firefox/CommandLineOptions
diff --git a/gog.js b/gog.js
index 40d8fad..0688626 100644
--- a/gog.js
+++ b/gog.js
@@ -21,7 +21,7 @@ const context = await firefox.launchPersistentContext(cfg.dir.browser, {
   viewport: { width: cfg.width, height: cfg.height },
   locale: 'en-US', // ignore OS locale to be sure to have english text for locators -> done via /en in URL
   recordVideo: cfg.record ? { dir: 'data/record/', size: { width: cfg.width, height: cfg.height } } : undefined, // will record a .webm video for each page navigated; without size, video would be scaled down to fit 800x800
-  recordHar: cfg.record ? { path: `data/record/gog-${datetime()}.har` } : undefined, // will record a HAR file with network requests and responses; can be imported in Chrome devtools
+  recordHar: cfg.record ? { path: `data/record/gog-${filenamify(datetime())}.har` } : undefined, // will record a HAR file with network requests and responses; can be imported in Chrome devtools
   handleSIGINT: false, // have to handle ourselves and call context.close(), otherwise recordings from above won't be saved
 });
 
diff --git a/prime-gaming.js b/prime-gaming.js
index 6e8cb03..91d3fe2 100644
--- a/prime-gaming.js
+++ b/prime-gaming.js
@@ -19,7 +19,7 @@ const context = await firefox.launchPersistentContext(cfg.dir.browser, {
   viewport: { width: cfg.width, height: cfg.height },
   locale: 'en-US', // ignore OS locale to be sure to have english text for locators
   recordVideo: cfg.record ? { dir: 'data/record/', size: { width: cfg.width, height: cfg.height } } : undefined, // will record a .webm video for each page navigated; without size, video would be scaled down to fit 800x800
-  recordHar: cfg.record ? { path: `data/record/pg-${datetime()}.har` } : undefined, // will record a HAR file with network requests and responses; can be imported in Chrome devtools
+  recordHar: cfg.record ? { path: `data/record/pg-${filenamify(datetime())}.har` } : undefined, // will record a HAR file with network requests and responses; can be imported in Chrome devtools
   handleSIGINT: false, // have to handle ourselves and call context.close(), otherwise recordings from above won't be saved
 });
 
diff --git a/unrealengine.js b/unrealengine.js
index e67633e..2bb8ee9 100644
--- a/unrealengine.js
+++ b/unrealengine.js
@@ -25,7 +25,7 @@ const context = await firefox.launchPersistentContext(cfg.dir.browser, {
   // userAgent for firefox: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:106.0) Gecko/20100101 Firefox/106.0
   locale: 'en-US', // ignore OS locale to be sure to have english text for locators
   recordVideo: cfg.record ? { dir: 'data/record/', size: { width: cfg.width, height: cfg.height } } : undefined, // will record a .webm video for each page navigated; without size, video would be scaled down to fit 800x800
-  recordHar: cfg.record ? { path: `data/record/ue-${datetime()}.har` } : undefined, // will record a HAR file with network requests and responses; can be imported in Chrome devtools
+  recordHar: cfg.record ? { path: `data/record/ue-${filenamify(datetime())}.har` } : undefined, // will record a HAR file with network requests and responses; can be imported in Chrome devtools
   handleSIGINT: false, // have to handle ourselves and call context.close(), otherwise recordings from above won't be saved
 });