day-seconds
Get the number of seconds/milliseconds in a day.
week-seconds
Get the number of seconds/milliseconds in a week.
year-seconds
Get the number of seconds/milliseconds in leap/noleap year.
leap-seconds-list
The list of leap seconds declared at https://www.ietf.org/timezones/data/leap-seconds.list.
leapseconds
Calculates the leap seconds inserted before a given date.