This post on my website shows you how to configure a JSON POST Webhook to ThingsSpeak that will include a date/time stamp and optionally latitude, longitude, and elevation metadata.
The ThingSpeak IoT Platform allows you to aggregate, visualize, and analyze live data streams in the cloud. Data can be sent to ThingSpeak using both REST and MQTT APIs. Data analysis and visualization is performed using MATLAB apps. A ThingSpeak Alerts API allows you to send email alerts. The free account permits publishing up to four channels at a message rate of up to every 15 seconds (or longer).