[FeteCommuniste]

Unreliability on the scale of weeks would be rather less significant than years or decades.

[gifnamething]

Only if you're planning on telling the truth

[nomel]

You're making the odd assumption that the clerk at the counter was able to, or cared enough, to backdate the birth certificate, and that there was an intentional lie, from the parents. This suggests an extreme naivety of the role/important of birth dates, 90 years ago.