DT 3.7.1 on macOS 11.3.1; Region: Germany; First day of week: Monday; Calendar: Gregorian; Time format: 24-Hour Time; Preferred languages: English (UK) - Primary, German (Germany)
annotate a file in the annotations inspector by selecting New from Template/Default Annotation – Markdown
Note the Date & Time. Now take a look at the annotation itself:
Note the date & time in the left panel (identical to the date & time in the annotations inspector) and in the right panel (which seems always to default to the 1st of the month, and seems to gain a line and a tab).
The forum software also interprets this input as a list rather than a date, but at least does not then start the list from 1, so the only impact is removal of the initial 0 and addition of a tab.
The next release will improve the placeholder handling in case of Markdown templates. E.g. 6. May 2021 at the beginning of a line will be converted to 6\. May 2021 and rendered as expected.