slots.js

function beginEpochTime() {
  var d = new Date(1462953000000);

  return d;
}

function getEpochTime(time) {
  if (time === undefined) {
    time = (new Date()).getTime();
  }
  var d = beginEpochTime();
  var t = d.getTime();
  return Math.floor((time - t) / 1000);
}

module.exports = {

  interval: 10,

  delegates: 20,

  getTime: function(time) {
    return getEpochTime(time);
  },

  getRealTime: function(epochTime) {
    if (epochTime === undefined) {
      epochTime = this.getTime()
    }
    var d = beginEpochTime();
    var t = Math.floor(d.getTime() / 1000) * 1000;
    return t + epochTime * 1000;
  },

  getSlotNumber: function(epochTime) {
    if (epochTime === undefined) {
      epochTime = this.getTime()
    }
    return Math.floor(epochTime / this.interval);
  },

  getSlotTime: function(slot) {
    return slot * this.interval;
  },

  getNextSlot: function() {
    var slot = this.getSlotNumber();

    return slot + 1;
  },

  getLastSlot: function(nextSlot) {
    return nextSlot + this.delegates;
  },

  roundTime: function(date) {
    Math.floor(date.getTime() / 1000) * 1000
  }
}