react-native-chart-kit/src/contribution-graph/dateHelpers.js

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// returns a new date shifted a certain number of days (can be negative)
export function shiftDate(date, numDays) {
  const newDate = new Date(date)
  newDate.setDate(newDate.getDate() + numDays)
  return newDate
}

export function getBeginningTimeForDate(date) {
  return new Date(date.getFullYear(), date.getMonth(), date.getDate())
}

// obj can be a parseable string, a millisecond timestamp, or a Date object
export function convertToDate(obj) {
  return (obj instanceof Date) ? obj : (new Date(obj))
}