Tagged dates

Move a date forward or back by working days, skipping weekends and a caller-supplied holiday list.

Shift an ISO date by a whole number of days, forwards or backwards, with exact calendar arithmetic.

Add calendar months to an ISO date, clamping to the month end: 31 Jan + 1 month is 28 or 29 Feb.

Age in whole years on a given date, with 29 February birthdays ageing on 1 March in other years.

UK bank and public holidays for a region and year, as published by gov.uk, including one-off holidays.

Working days between two dates, excluding weekends and a caller-supplied holiday list.

Year fraction between two dates by ACT/365F, ACT/360, 30/360, 30E/360 or ACT/ACT ISDA, as an exact fraction.

The ISO 8601 day of the week for a date: 1 is Monday through 7 is Sunday.

Calendar days from one ISO date to another, signed: negative when the second date is earlier.

Whether a year is a Gregorian leap year: every 4th, except centuries, except every 400th.

The first day, last day and length of the calendar month containing a date.

Days two date ranges have in common, with the end of each range stated as inclusive or exclusive.

Calendar quarter and fiscal quarter of a date, with the fiscal year and quarter date ranges, for any start month.

The next n dates of a repeating rule: monthly on a day, last weekday of the month, every k days or weeks, yearly.

The UK personal tax year containing a date: 6 April to 5 April, with HMRC's label.

ISO 8601 week number and week-numbering year of a date: weeks start Monday, week 1 holds the first Thursday.