You probably mean RFC3339, which overlaps with ISO 8601 and allows this. But the docs don't mention that RFC and only reference the ISO standard. You can compa

You probably mean RFC3339, which overlaps with ISO 8601 and allows this. But the docs don't mention that RFC and only reference the ISO standard. You can compare the formats here: https://ijmacd.github.io/rfc3339-iso8601/ https://ijmacd.github.io/rfc3339-iso8601/