UkParliamentPetitionDateMaths.js

/**
 * A snippet of code I used to compare two petitions on the UK Parliament web site - wanting to know
 * which grew fastest to challenge the claim "My Petition Is Bigger Than Yours".
 * This input data is from the JSON download from the petition web site.
 * A future version of this code could generalise its input to allow a petition to be selected for comparison.
 */

const data = {
    "Revoke Article 50":{
        "created_at": "2019-01-29T13:53:56.492Z",
        "updated_at": "2019-02-16T22:35:36.886Z",
        "rejected_at": null,
        "opened_at": "2019-02-11T17:08:20.928Z",
        "closed_at": null,
        "moderation_threshold_reached_at": "2019-01-29T16:19:13.966Z",
        "response_threshold_reached_at": "2019-02-12T07:46:09.405Z",
        "government_response_at": null,
        "debate_threshold_reached_at": "2019-02-16T15:17:14.708Z",
        "scheduled_debate_date": null,
        "debate_outcome_at": null,
    },
    "Hard Brexit":{
        "signature_count": 353427,
        "created_at": "2018-10-07T22:34:13.115Z",
        "updated_at": "2019-02-16T22:37:57.711Z",
        "rejected_at": null,
        "opened_at": "2018-10-17T09:57:44.028Z",
        "closed_at": null,
        "moderation_threshold_reached_at": "2018-10-10T10:54:22.833Z",
        "response_threshold_reached_at": "2018-11-27T21:28:02.990Z",
        "government_response_at": "2018-12-14T09:57:34.136Z",
        "debate_threshold_reached_at": "2018-12-15T18:51:04.394Z",
        "scheduled_debate_date": "2019-01-14",
        "debate_outcome_at": "2019-01-15T12:39:39.423Z"
    }
}

function report(name) {
    const poll = data[name];
    const opened_at = new Date(poll.opened_at),
          response_threshold_reached_at = new Date(poll.response_threshold_reached_at),
          debate_threshold_reached_at = new Date(poll.debate_threshold_reached_at);
    
    function toTime(milliseconds) {
        let minutes = milliseconds / 1000.0 / 60.0;
        let hours = minutes / 60.0;
        let days = hours / 24.0;

        minutes = (minutes % 60).toFixed(1);
        hours = (hours % 24).toFixed(0);
        days = days.toFixed(0);

        return `${days} days, ${hours} hours, ${minutes} minutes`;
    }

    console.dir({
        "Poll": name,
        "Time to reach 10,000": toTime(response_threshold_reached_at - opened_at),
        "Time to reach 100,000": toTime(debate_threshold_reached_at - opened_at)
    });
}

for (name in data) { report(name); }