Digital time stamping is a cryptographic technique allowing affixing a reliable date to a digital document. The security of most existing time stamping systems is based on the security of the used cryptographic techniques as hash functions. However, a hash function has a limited lifetime. In this paper, the authors provide a non-interactive time stamping scheme in the Bounded Storage Model (BSM) whose security is not related to the life of any cryptographic technique. They prove, in fact, that their time stamping scheme is eternally secure even against an adversary with unlimited computing power.