Rebol [ Library: [ level: 'beginner platform: 'all type: [one-liner function] domain: [db text text-processing] tested-under: ["REBOL/View 1.2.1.3.1 21-Jun-2001" "REBOL/View 1.3.1.3.1 17-Jun-2005 Core 2.6.0"] support: none license: 'pd see-also: none ] Title: "Convert 'Date' datatype to International Date - ISO 8601." Date: 08-Nov-2005 File: %iso-8601-date.r Purpose: {Simple one-liner function to covert date to ISO 8601 format. In my application a time stamp is not needed nor included in this function. For a function that includes a timestamp see: to-iso-8601-date.r} Version: 1.0.0 Author: "Gordon Raboud" ] { One line format } ISO8601Date: func [Date [Date!]] [to-string join Date/year ["-" copy/part tail join "0" [Date/month] -2 "-" copy/part tail join "0" [Date/day] -2 ]] { A bit more readable with shorter lines.} ISO8601Date: func [Date [Date!]] [ to-string join Date/year ["-" copy/part tail join "0" [Date/month] -2 "-" copy/part tail join "0" [Date/day] -2 ] ]