diff --git a/lib/HttpInput.php b/lib/HttpInput.php
index 7e360b52..d4347a30 100644
--- a/lib/HttpInput.php
+++ b/lib/HttpInput.php
@@ -188,7 +188,7 @@ class HttpInput{
 						try{
 							return intval($var);
 						}
-						catch(Exception){
+						catch(\Exception){
 							return null;
 						}
 					}
@@ -205,7 +205,7 @@ class HttpInput{
 						try{
 							return floatval($var);
 						}
-						catch(Exception){
+						catch(\Exception){
 							return null;
 						}
 					}
@@ -215,8 +215,7 @@ class HttpInput{
 						try{
 							return new DateTimeImmutable($var);
 						}
-						catch(Exception){
-							vdd('q');
+						catch(\Exception){
 							return null;
 						}
 					}
diff --git a/lib/Session.php b/lib/Session.php
index b11a4d94..d954ade9 100644
--- a/lib/Session.php
+++ b/lib/Session.php
@@ -2,8 +2,6 @@
 use Ramsey\Uuid\Uuid;
 use Safe\DateTimeImmutable;
 
-use function Safe\strtotime;
-
 /**
  * @property User $User
  * @property string $Url
@@ -100,7 +98,7 @@ class Session{
 	}
 
 	public static function SetSessionCookie(string $sessionId): void{
-		setcookie('sessionid', $sessionId, ['expires' => strtotime('+1 week'), 'path' => '/', 'domain' => SITE_DOMAIN, 'secure' => true, 'httponly' => false, 'samesite' => 'Lax']); // Expires in two weeks
+		setcookie('sessionid', $sessionId, ['expires' => (new DateTimeImmutable('+1 week'))->format('@'), 'path' => '/', 'domain' => SITE_DOMAIN, 'secure' => true, 'httponly' => false, 'samesite' => 'Lax']); // Expires in two weeks
 	}
 
 	/**
diff --git a/www/ebooks/download.php b/www/ebooks/download.php
index 49907a17..8ba94fd8 100644
--- a/www/ebooks/download.php
+++ b/www/ebooks/download.php
@@ -1,6 +1,5 @@
 <?
 use function Safe\apcu_fetch;
-use function Safe\strtotime;
 
 // If the user is not logged in, or has less than some amount of downloads, show a thank-you page
 
@@ -61,7 +60,7 @@ try{
 
 	// Increment local download count, expires in 2 weeks
 	$downloadCount++;
-	setcookie('download-count', (string)$downloadCount, ['expires' => strtotime('+2 week'), 'path' => '/', 'domain' => SITE_DOMAIN, 'secure' => true, 'httponly' => false, 'samesite' => 'Lax']);
+	setcookie('download-count', (string)$downloadCount, ['expires' => (new DateTimeImmutable('+2 week'))->format('@'), 'path' => '/', 'domain' => SITE_DOMAIN, 'secure' => true, 'httponly' => false, 'samesite' => 'Lax']);
 }
 catch(Exceptions\InvalidFileException | Exceptions\EbookNotFoundException){
 	Template::Emit404();
diff --git a/www/settings/post.php b/www/settings/post.php
index 0f90cce1..842a80da 100644
--- a/www/settings/post.php
+++ b/www/settings/post.php
@@ -1,11 +1,9 @@
 <?
-use function Safe\strtotime;
-
 $hideDonationAlert = HttpInput::Bool(POST, 'hide-donation-alert');
 $colorScheme = HttpInput::Str(POST, 'color-scheme');
 
 if($hideDonationAlert !== null){
-	setcookie('hide-donation-alert', $hideDonationAlert ? 'true' : 'false', ['expires' => strtotime('+1 month'), 'path' => '/', 'domain' => SITE_DOMAIN, 'secure' => true, 'httponly' => true, 'samesite' => 'Lax']);
+	setcookie('hide-donation-alert', $hideDonationAlert ? 'true' : 'false', ['expires' => (new DateTimeImmutable('+1 month'))->format('@'), 'path' => '/', 'domain' => SITE_DOMAIN, 'secure' => true, 'httponly' => true, 'samesite' => 'Lax']);
 }
 
 if($colorScheme !== null){
@@ -18,7 +16,7 @@ if($colorScheme !== null){
 		setcookie('color-scheme', '', ['expires' => 0, 'path' => '/', 'domain' => SITE_DOMAIN, 'secure' => true, 'httponly' => true, 'samesite' => 'Lax']);
 	}
 	else{
-		setcookie('color-scheme', $colorScheme, ['expires' => strtotime('+1 year'), 'path' => '/', 'domain' => SITE_DOMAIN, 'secure' => true, 'httponly' => true, 'samesite' => 'Lax']);
+		setcookie('color-scheme', $colorScheme, ['expires' => (new DateTimeImmutable('+1 year'))->format('@'), 'path' => '/', 'domain' => SITE_DOMAIN, 'secure' => true, 'httponly' => true, 'samesite' => 'Lax']);
 	}
 }