in src/datasource.ts [379:390]
timeFormat(time: Date[]) {
let step: TimeType;
const unix = Math.round(time[1].getTime()) - Math.round(time[0].getTime());
if (unix <= 60 * 60 * 1000) {
step = TimeType.MINUTE_TIME;
} else if (unix <= 24 * 60 * 60 * 1000) {
step = TimeType.HOUR_TIME;
} else {
step = TimeType.DAY_TIME;
}
return { start: time[0], end: time[1], step };
}