You can pass a date or unix code as a parameter in the url and it will check to see whether that string contains either a unix timestamp or a natural language date (ex. August 8, 2017).
https://amp-timestamp.glitch.me/December%2015,%202015
https://amp-timestamp.glitch.me/1450137600
{
"unix": 1450137600,
"natural": "December 15, 2015"
}