diff --git a/app/services/events/create_batch_service.rb b/app/services/events/create_batch_service.rb
index 14d19685128..5a7b89c321c 100644
--- a/app/services/events/create_batch_service.rb
+++ b/app/services/events/create_batch_service.rb
@@ -47,13 +47,15 @@ def validate_events
         event.external_subscription_id = event_params[:external_subscription_id]
         event.properties = event_params[:properties] || {}
         event.metadata = metadata || {}
-        event.timestamp = Time.zone.at(event_params[:timestamp] ? event_params[:timestamp].to_f : timestamp)
+        event.timestamp = Time.zone.at(event_params[:timestamp] ? Float(event_params[:timestamp]) : timestamp)
         event.precise_total_amount_cents = event_params[:precise_total_amount_cents]
 
         CalculateExpressionService.call(organization:, event:).raise_if_error!
 
         result.events.push(event)
         result.errors = result.errors.merge({index => event.errors.messages}) unless event.valid?
+      rescue ArgumentError
+        result.errors = result.errors.merge({index => {timestamp: ['invalid_format']}})
       end
     end
 
diff --git a/app/services/events/create_service.rb b/app/services/events/create_service.rb
index 1fae7bbdbcb..925f539ae85 100644
--- a/app/services/events/create_service.rb
+++ b/app/services/events/create_service.rb
@@ -18,7 +18,7 @@ def call
       event.external_subscription_id = params[:external_subscription_id]
       event.properties = params[:properties] || {}
       event.metadata = metadata || {}
-      event.timestamp = Time.zone.at(params[:timestamp] ? params[:timestamp].to_f : timestamp)
+      event.timestamp = Time.zone.at(params[:timestamp] ? Float(params[:timestamp]) : timestamp)
       event.precise_total_amount_cents = params[:precise_total_amount_cents]
 
       CalculateExpressionService.call(organization:, event:).raise_if_error!
@@ -35,6 +35,8 @@ def call
       result.record_validation_failure!(record: e.record)
     rescue ActiveRecord::RecordNotUnique
       result.single_validation_failure!(field: :transaction_id, error_code: 'value_already_exist')
+    rescue ArgumentError
+      result.single_validation_failure!(field: :timestamp, error_code: 'invalid_format')
     end
 
     private
diff --git a/app/services/events/validate_creation_service.rb b/app/services/events/validate_creation_service.rb
index a4ced8c4254..46578d639cb 100644
--- a/app/services/events/validate_creation_service.rb
+++ b/app/services/events/validate_creation_service.rb
@@ -37,6 +37,7 @@ def validate_create
         return missing_subscription_error
       end
 
+      return invalid_timestamp_error unless valid_timestamp?
       return transaction_id_error unless valid_transaction_id?
       return invalid_code_error unless valid_code?
       return invalid_properties_error unless valid_properties?
@@ -44,6 +45,13 @@ def validate_create
       nil
     end
 
+    def valid_timestamp?
+      return true if params[:timestamp].blank?
+
+      # timestamp is a number of seconds
+      valid_number?(params[:timestamp])
+    end
+
     def valid_transaction_id?
       return false if params[:transaction_id].blank?
 
@@ -92,6 +100,10 @@ def invalid_customer_error
       result.not_found_failure!(resource: 'customer')
     end
 
+    def invalid_timestamp_error
+      result.validation_failure!(errors: {timestamp: ['invalid_format']})
+    end
+
     def billable_metric
       @billable_metric ||= organization.billable_metrics.find_by(code: params[:code])
     end
diff --git a/spec/requests/api/v1/events_controller_spec.rb b/spec/requests/api/v1/events_controller_spec.rb
index d9053105430..14a66ab94ef 100644
--- a/spec/requests/api/v1/events_controller_spec.rb
+++ b/spec/requests/api/v1/events_controller_spec.rb
@@ -58,6 +58,28 @@
         expect(response).to have_http_status(:unprocessable_entity)
       end
     end
+
+    context 'when sending wrong format for the timestamp' do
+      let(:create_params) do
+        {
+          code: metric.code,
+          transaction_id: SecureRandom.uuid,
+          external_subscription_id: subscription.external_id,
+          timestamp: Time.current.to_s,
+          precise_total_amount_cents: '123.45',
+          properties: {
+            foo: 'bar'
+          }
+        }
+      end
+
+      it 'returns a not found response' do
+        expect { subject }.not_to change(Event, :count)
+
+        expect(response).to have_http_status(:unprocessable_entity)
+        expect(json[:error_details]).to eq({timestamp: ["invalid_format"]})
+      end
+    end
   end
 
   describe 'POST /api/v1/events/batch' do
@@ -88,6 +110,40 @@
       expect(response).to have_http_status(:ok)
       expect(json[:events].first[:external_subscription_id]).to eq(subscription.external_id)
     end
+
+    context 'with invalid timestamp for one event' do
+      let(:batch_params) do
+        [
+          {
+            code: metric.code,
+            transaction_id: SecureRandom.uuid,
+            external_subscription_id: subscription.external_id,
+            timestamp: Time.current.to_i,
+            precise_total_amount_cents: '123.45',
+            properties: {
+              foo: 'bar'
+            }
+          },
+          {
+            code: metric.code,
+            transaction_id: SecureRandom.uuid,
+            external_subscription_id: subscription.external_id,
+            timestamp: Time.current.to_s,
+            precise_total_amount_cents: '123.45',
+            properties: {
+              foo: 'bar'
+            }
+          }
+        ]
+      end
+
+      it 'returns an error indicating which event contained which error' do
+        expect { subject }.not_to change(Event, :count)
+
+        expect(response).to have_http_status(:unprocessable_entity)
+        expect(json[:error_details]).to eq({'1': {timestamp: ["invalid_format"]}})
+      end
+    end
   end
 
   describe 'GET /api/v1/events' do
diff --git a/spec/services/events/create_batch_service_spec.rb b/spec/services/events/create_batch_service_spec.rb
index 8ff38306cb7..8d859e3c516 100644
--- a/spec/services/events/create_batch_service_spec.rb
+++ b/spec/services/events/create_batch_service_spec.rb
@@ -196,6 +196,35 @@
       end
     end
 
+    context 'when timestamp is in a wrong format' do
+      let(:timestamp) { Time.current.to_s }
+      let(:events_params) do
+        {
+          events: [
+            {
+              external_customer_id: SecureRandom.uuid,
+              external_subscription_id: SecureRandom.uuid,
+              code:,
+              transaction_id: SecureRandom.uuid,
+              precise_total_amount_cents:,
+              properties: {foo: 'bar'},
+              timestamp:
+            }
+          ]
+        }
+      end
+
+      it 'returns an error' do
+        result = nil
+        expect { result = create_batch_service.call }.not_to change(Event, :count)
+
+        expect(result).not_to be_success
+        expect(result.error).to be_a(BaseService::ValidationFailure)
+        expect(result.error.messages.keys).to include(0)
+        expect(result.error.messages[0][:timestamp]).to include('invalid_format')
+      end
+    end
+
     context "with an expression configured on the billable metric" do
       let(:billable_metric) { create(:billable_metric, code:, organization:, field_name: "result", expression: "concat(event.properties.foo, '-bar')") }
 
diff --git a/spec/services/events/create_service_spec.rb b/spec/services/events/create_service_spec.rb
index d512753ce32..cd87e1b0e63 100644
--- a/spec/services/events/create_service_spec.rb
+++ b/spec/services/events/create_service_spec.rb
@@ -117,6 +117,17 @@
       end
     end
 
+    context 'when timestamp is given in a wrong format' do
+      let(:timestamp) { Time.current.to_s }
+
+      it 'returns an error' do
+        result = create_service.call
+
+        expect(result).not_to be_success
+        expect(result.error.messages).to include({timestamp: ['invalid_format']})
+      end
+    end
+
     context 'when kafka is configured' do
       let(:karafka_producer) { instance_double(WaterDrop::Producer) }
 
diff --git a/spec/services/events/validate_creation_service_spec.rb b/spec/services/events/validate_creation_service_spec.rb
index 3bb0c8d208e..58685b453e1 100644
--- a/spec/services/events/validate_creation_service_spec.rb
+++ b/spec/services/events/validate_creation_service_spec.rb
@@ -254,5 +254,31 @@
         end
       end
     end
+
+    context 'when timestamp is in a wrong format' do
+      let(:params) do
+        {external_customer_id: customer.external_id, code: billable_metric.code, transaction_id:, timestamp: '2025-01-01'}
+      end
+
+      it 'returns a timestamp_is_not_valid error' do
+        validate_event
+
+        expect(result).not_to be_success
+        expect(result.error).to be_a(BaseService::ValidationFailure)
+        expect(result.error.messages.keys).to include(:timestamp)
+        expect(result.error.messages[:timestamp]).to include('invalid_format')
+      end
+    end
+
+    context 'when timestamp is valid' do
+      let(:params) do
+        {external_customer_id: customer.external_id, code: billable_metric.code, transaction_id:, timestamp: Time.current.to_i + 0.11}
+      end
+
+      it 'does not raise any errors' do
+        expect(validate_event).to be_nil
+        expect(result).to be_success
+      end
+    end
   end
 end