pub fn validate_timezone_utc(dtm_value: &str) -> ConditionResultExpand description
Validate that a DTM value’s timezone portion is “+00” (UTC).
DTM format 303 with timezone: CCYYMMDDHHMM+ZZ or CCYYMMDDHHMM-ZZ (15 chars). Checks that the last 3 characters are “+00”.
Example: validate_timezone_utc("202601012200+00") → True
Example: validate_timezone_utc("202601012200+01") → False