i am trying to scrap the historical token data from coinmarketcap.com and i am facing with some issues. Would like to get some help here.

For example, i want to access the all the available price data for a token

<https://coinmarketcap.com/currencies/tether/historical-data/?start=20130428&end=20180731>

But the issue is how do i get the earliest start date available for each token? I found that the earliest start date is available in some javascript function instead of html tag. 

A snapshot of the earliest start date in "All Time" but its a javascript function.

```
 ranges: {
        'Last 7 Days': [moment.utc().subtract(6, 'days'), moment.utc()],
        'Last 30 Days': [moment.utc().subtract(30, 'days'), moment.utc()],
        'Last 3 Months': [moment.utc().subtract(3, 'months'), moment.utc()],
        'Last 12 Months': [moment.utc().subtract(12, 'months'), moment.utc()],
        'Year To Date': [moment.utc().startOf('year'), moment.utc()],
        'All Time': ["04-28-2013", moment.utc()]

```

Anyone have any idea how to go about doing this ? Thank you very much