local-offsetUtility functions relating to the local UTC offset.
- Whether to adjust the date, and in which direction. Useful when implementing arithmetic.
- Get the number of calendar days in a given year.
- Get the number of days in the month of a given year.
- Returns if the provided year is a leap year in the proleptic Gregorian calendar. Uses astronomical year numbering.
- Get the number of weeks in the ISO year.