Checks whether a lifetime is current, applying a symmetric ~1h grace
window to tolerate minor clock skew (D-08): rejects only if now is
before notBefore - 3600 or after notAfter + 3600.
Parameters
lifetime: Lifetime
The lifetime object with notBefore and notAfter fields
Returns boolean
True if now is within the lifetime's range plus grace, false otherwise
Checks whether a lifetime is current, applying a symmetric ~1h grace window to tolerate minor clock skew (D-08): rejects only if
nowis beforenotBefore - 3600or afternotAfter + 3600.