The US Realm Clinical Document Date and Time datatype flavor records date and time information. If no time zone offset is provided, you can make no assumption about time, unless you have made a local exchange agreement.
Classification
HL7 V2/V3 Datatype Level Template
Open/Closed
Open (other than defined elements are allowed)
Item
DT
Card
Conf
Description
Label
Schematron assert
role
error
test
string-length(@value)>=8
Message
SHALL be precise to the day
Schematron assert
role
warning
test
string-length(@value)>=12
Message
SHOULD be precise to the minute
Schematron assert
role
warning
test
string-length(@value)>=14
Message
MAY be precise to the second
Schematron assert
role
warning
test
string-length(@value)<10 or ( string-length(@value)>=10 and (contains(@value,'+') or contains(@value,'-')))
Message
If more precise than day, SHOULD include time-zone offset