Dates

• add Add or subtract days, months or business days to a date.
• calendar A month or a whole year, with week numbers, ready to print.
• diff Days, months or business days between two dates.
• duration Add up durations (1h30, 45 min…) and convert them.
• holidays The public holidays of a year, in France, Europe or North America.
• timestamp Unix timestamp to date, and back.
• timezones The same time in several time zones.
• week The ISO week number of a date, and the days of a week.