Military age = 18 for voluntary service
Conscription = Yes, for men and women.
Available for military service = 2,605,137, age 18–49 (2023)
Fit for military service = 2,107,794, age 18–49 (2023)
Reaching military age annually = 76,970 (2023)
Active personnel = 21,000 military & 4,638 civilian (2024)
Reserve personnel = 12,000 + 51,000 volunteers in the Home Guard
Deployed personnel = 800 (2024)
the military retains the capability to continually deploy 2,000 soldiers in international service or 5,000 over a short time span.
https://en.wikipedia.org/wiki/Danish_Defence
Awe-inspiring. "Tooth to tail" calculations suggest that only a portion of those dispatched would be combat efficient.
Your other comment that China might try to "belt and road" Greenland is apt. But a notion that Greenland can be defended by Denmark is a bit of good humor for the day.