diff --git a/lib/Pear/LocalLoop/Controller/Api/Upload.pm b/lib/Pear/LocalLoop/Controller/Api/Upload.pm
index e7f7e29..a1880b8 100644
--- a/lib/Pear/LocalLoop/Controller/Api/Upload.pm
+++ b/lib/Pear/LocalLoop/Controller/Api/Upload.pm
@@ -99,8 +99,8 @@ sub post_upload {
   $validation->required('transaction_value')->number->gt_num(0);
   $validation->required('transaction_type')->in( 1, 2, 3 );
 
-  #Check a purchase time was submitted
-  $validation->required('purchase_time');
+  #Check a proper purchase time was submitted
+  $validation->required('purchase_time')->is_full_iso_datetime;
 
   # First pass of required items
   return $c->api_validation_error if $validation->has_error;
diff --git a/lib/Pear/LocalLoop/Plugin/Validators.pm b/lib/Pear/LocalLoop/Plugin/Validators.pm
index cc07414..33aeca2 100644
--- a/lib/Pear/LocalLoop/Plugin/Validators.pm
+++ b/lib/Pear/LocalLoop/Plugin/Validators.pm
@@ -58,6 +58,12 @@ sub register {
     $value = $app->datetime_formatter->parse_datetime( $value );
     return defined $value ? undef : 1;
   });
+
+  $app->validator->add_check( is_full_iso_datetime => sub {
+    my ( $validation, $name, $value ) = @_;
+    $value = $app->parse_iso_datetime( $value );
+    return defined $value ? undef : 1;
+  });
 }
 
 1;
diff --git a/t/plugins/validators.t b/t/plugins/validators.t
index 81c2f02..1bfc5b8 100644
--- a/t/plugins/validators.t
+++ b/t/plugins/validators.t
@@ -4,6 +4,7 @@ use warnings;
 use Mojolicious::Lite;
 use Test::More;
 
+plugin 'Pear::LocalLoop::Plugin::Datetime';
 plugin 'Pear::LocalLoop::Plugin::Validators';
 
 my $validator = app->validator;
@@ -16,6 +17,8 @@ my $valid_postcode = 'WC1H 9EB';
 my $invalid_postcode = 'AB1 2CD';
 my $not_a_postcode = 'a';
 my $not_a_whole_postcode = 'LA1';
+my $valid_purchase_time = '2017-08-14T11:29:07.965+01:00';
+my $invalid_purchase_time = '2017081411:29:07';
 
 $validation->input({
   valid_email => $valid_email,
@@ -24,6 +27,8 @@ $validation->input({
   invalid_postcode => $invalid_postcode,
   not_a_postcode => $not_a_postcode,
   not_a_whole_postcode => $not_a_whole_postcode,
+  valid_purchase_time => $valid_purchase_time,
+  invalid_purchase_time => $invalid_purchase_time,
 });
 
 $validation->required('valid_email')->email;
@@ -32,8 +37,10 @@ $validation->required('valid_postcode')->postcode;
 $validation->required('invalid_postcode')->postcode;
 $validation->required('not_a_postcode')->postcode;
 $validation->required('not_a_whole_postcode')->postcode;
+$validation->required('valid_purchase_time')->is_full_iso_datetime;
+$validation->required('invalid_purchase_time')->is_full_iso_datetime;
 
 ok $validation->has_error, 'Have Errors';
-is_deeply $validation->failed, [ qw/ invalid_email invalid_postcode not_a_postcode not_a_whole_postcode / ], 'Correct Errors';
+is_deeply $validation->failed, [ qw/ invalid_email invalid_postcode invalid_purchase_time not_a_postcode not_a_whole_postcode / ], 'Correct Errors';
 
 done_testing;