Description
DateTime can be used in case the exact point in time is needed/ useful in a context (e.g. Measurement/ startDate).
Use
DateTime is used to store specific points or periods in time e.g. measurement of blood pressure during a long term observation.
Not use
Do not use for data that does not need time information.
Data Model
| Name | Type | M | Description | Example |
| dateTime | String | X | Contains the date, format must follow a pattern (see rules) | “2014-05-09T08:01:07.143” |
Rules
The pattern for the dateTime string is (d means digit):
| 4 d | – | d:0 or 1 | d | – | d:0 till 3 | d | T | d:0 till 2 | d | : | d:0 till 5 | d | : | d:0 till 5 | d | . | 3 d | + or – | 2 d | : | 2 d |
| y | month | day | hour (24h) | min | sec | milli-sec | time shift | ||||||||||||||
What gives following options:
| Coded date | Equivalent date |
| 2014-10-13T11:24:57 | October 13th 2014 at 11:24 and 57 seconds |
| 2014-10-13T11:24:57.321 | October 13th 2014 at 11:24, 57 seconds and 321 milliseconds |
| 2014-10-13T11:24:57+08:00 | October 13th 2014 at 11:24, 57 seconds in time zone UTC+8 (Singapore) |
| 2014-10-13T11:24:57.543+08:00 | October 13th 2014 at 11:24, 57 seconds and 321 milliseconds in UTC+8 |
Update Rhythm
Depends on use case. Creation dates of other records are only set once but “last change” information to a dataset could be set more often.