On March 6, you are able to escape from the basement. And the kidnapper can not do anything.
You: It's national leave the basement day!
Kidnapper: Oh shit yeah my fault, you free to go.
On March 19, that is a day of when anyone who has kidnapped you, has to too free you.
You: Hey, it's national leave the basement day!
Kidnapper: Oh shit my fault, you good to go