iso-8601-date
2019-01-07
No Description
EclecticSE ISO 8601 Date Representation Routines
David K. Trudgett
Miscellaneous date routines based around the ISO 8601 string representation.
Function List
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d/m/y->iso-8601-date
Convert a date string in d/m/y format into ISO 8601 string format. Returns NIL for invalid dates. Does not check leap year for the number of days in February (assumes 29 February is correct).
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date-add
Add a given number of days to a date.
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date-diff
Return the number of days between two dates.
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date-portion
Return the date portion of an ISO 8601 date/time string. Assumes that the date string contains hyphen separators, and is therefore exactly ten characters long.
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day-of-week
For a given date, return the day of the week on which it falls.
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extract-day
For a given date, return the integer value of the day of the month.
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extract-month
For a given date, return the integer value of the month of the year.
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extract-year
For a given date, return the integer value of the year.
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human-date
Strip the T from an ISO 8601 date, and remove decimal portion of the seconds value, if any.
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iso-8601-date-now
Return today's date in ISO 8601 string format.
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iso-8601-date-time-now
Return the current date and time as an ISO 8601 date and time string.
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iso-8601-time-now
Return the current time in ISO 8601 string format.
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last-month
Return the ISO 8601 year/month string for the month previous to the current month. Example: if current month is May 2020, return "2020-04".
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make-iso-8601-date
Given numerical values for the year, month and day of the month, return the corresponding ISO 8601 date string.
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num-day-of-week
For a given ISO 8601 date string, return the numerical day of the week on which it falls, where 1 = Sunday, and so on. Note: Monday is not the first day of the week.
License
LLGPL