variable in API URL JSON

Hello people,

I am using a JSON API string to fetch date from a date range which is parameterized. Because of that I have to change values everyday to fetch details. This URL look something like this :

Source = Json.Document(Web.Contents(XXXXXX&from_date=2018-07-01+00%3A00%3A00&to_date=2018-07-18+12%3A00%3A00&XXXXX"))

Now I need to set to_date as TODAY() in yyyy-mm-dd hh:mm:ss format. Help me with this.

Thanks and Regards,

Piyush