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Suppose I have an ISO 8601 duration, expressed as "P1M". Phrased colloquially, this means "one month." Is there a standard rule for converting this into a number of seconds, assuming the start date is not known?
My gut says there's no way to resolve "one month" to an exact number of seconds without knowing context, and where those seconds are laid out on the calendar. But are there standard rules/conventions to calculate these durations in an abstract way?
737
Briefly, the ISO 8601 notation consists of a P character, followed by years, months, weeks, and days, followed by a T character, followed by hours, minutes, and seconds with a decimal part, each with a single-letter suffix that indicates the unit. Any zero components may be omitted.
ISO 8601 represents date and time by starting with the year, followed by the month, the day, the hour, the minutes, seconds and milliseconds. For example, 2020-07-10 15:00:00.000, represents the 10th of July 2020 at 3 p.m. (in local time as there is no time zone offset specified—more on that below).
Date.prototype.toISOString() The toISOString() method returns a string in simplified extended ISO format (ISO 8601), which is always 24 or 27 characters long ( YYYY-MM-DDTHH:mm:ss.sssZ or ±YYYYYY-MM-DDTHH:mm:ss.sssZ , respectively). The timezone is always zero UTC offset, as denoted by the suffix Z .
The International Organization for Standardization (ISO) date and time format is a standard way to express a numeric calendar date -- and optionally time -- in a format that eliminates ambiguity between entities.
You are right, an ISO 8601 duration is dependent of the context. A duration is a period/an interval of time between two dates.
Example :
2020-01-01/2020-02-01 = P1M = P31D
2020-02-01/2020-03-01 = P1M = P29D
2019-02-01/2019-03-01 = P1M = P28D
If you want a fixed duration indepedent of the context, use the day notation P30D, P60D, P90D... instead.
The same applies for years :
2019-01-01/2020-01-01 = P1Y = P12M = P365D
2020-01-01/2021-01-01 = P1Y = P12M = P366D
If you can't have context information about a duration, for example P1M retrieved from database or given by user input, use by default today's context.
//What is a duration of one month in seconds ?
P1M = ? (no context)
//Use default context
Today = 2020-03-31
2020-03-31/P1M = 2020-03-31/2020-04-30
=> P1M = P30D
//A month contains 2 592 000 seconds
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