image credit: Fabrizio Verrecchia*
quick notes on ISO 8601 style for date and time:
*a link; see a note on notes and links; see also a disclaimer / … and maybe browse or search the post archive*
2023-09-13 … screenshot of teaser for 2023-01 piece on Substack
date and time values are ordered left to right, from largest unit of time to smallest, / ISO 8601 (!w2, !?)
and the sequence may end with any unit: year, month, day, hour, minute, …basic format separates date from time with a capital Textended format uses hyphens and colons to separate units within these fieldsuse extended format, not basic, in running textmidnight – 00:00 in extended format – marks the start of a daytime with no date: T00, T0000, T00:00, and 00:00 / examples for midnight
local time is implied if no offset is appended
a compliant offset for PST is −08, for PDST, −07 / Unicode minus sign, U+2212 (!?)
compliant offsets for UTC, aka Zulu time, include +00 and Z
20201217T1754−08
*a link; see a note on notes and links; see also a disclaimer / … and maybe browse or search the post archive*
2023-09-13 … screenshot of teaser for 2023-01 piece on Substack