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@stll/time

v0.3.0

Published

Time helpers: named duration constants, calendar-date parsing and arithmetic, and a side-effect-free Temporal

Vulnerabilities

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Links

Git

Maintainers

jan-kubicajan-kubica

Keywords

datedurationtemporaltime

Readme

@stll/time

Time helpers: named duration constants (DAY_IN_MS), calendar-date parsing and arithmetic (parsePlainDate, parseIsoDateLocal, isIsoDateString, addDays), the user-facing calendar day (todayFor(zone)), and a side-effect-free Temporal that uses the runtime's native implementation when it exists.

DAY_IN_MS is a duration, not a calendar day: a day that crosses a DST transition is 23 or 25 hours, so moving to another calendar date goes through addDays.

todayFor(zone, at?) is the one way to ask which calendar day it is for a person: pass the user's or organization's IANA zone. The UTC day (Temporal.Now.plainDateISO("UTC"), toISOString().slice(0, 10)) is a different day for hours around local midnight, and the calendar-day lint rule rejects it as a user-facing day.

parseTimeZoneId(value) reads a stored or requested zone into the TimeZoneId brand: the runtime tz database's spelling, or null for an unknown id or a fixed UTC offset (which never observes daylight saving time).