date-toolkit (npm): The package used to learn the date time related calculation algorithm (Not guaranteed to be bug free)
Keywords: date|date formate|datetime|dates-utils|date-tools|datekit|isLeapYear|daysInMonth|dayOfYear|timestamp formatter|monthDiff|isEqual|add date|diff date|quarter|date-utils|day-of-year|days-in-month|format|is-leap-year|month-diff