LOL by its nature, a Stipulation is joint, see......local rule of US Dist Ct N D CA

6-2. Stipulated Request for Order Changing Time

1. (a) Form and Content. The parties may file a stipulation, conforming to Civil L.R. 7-12, requesting an order changing time that would affect the date of an event or deadline already fixed by Court order, or that would accelerate or extend time frames set in the Local Rules or in the Federal Rules. The stipulated request must be accompanied by a declaration that:
   1. (1) Sets forth with particularity, the reasons for the requested enlargement or shortening of time;
   2. (2) Discloses all previous time modifications in the case, whether by stipulation or Court order; and
   3. (3) Describes the effect the requested time modification would have on the schedule for the case.
2. (b) Action by the Court. After receiving a stipulated request under this Rule, the Judge may grant, deny or modify the requested time change.