From the moment the San Diego Chargers and Oakland Raiders announced a partnership to build a stadium together in Carson, the cities of San Diego and Oakland were on the clock.

If the sense of urgency hadn’t dawned on San Diego officials at that point, the NFL’s Los Angeles stadium point man made it crystal clear Tuesday time is of the essence.

And reading between the lines of NFL vice president Eric Grubman’s comments after his meeting with the San Diego stadium task force, it’s hard to feel positive about where San Diego is headed at this point relative to coming up with a stadium that can adequately be financed and suit the Chargers needs.

The primary misgivings the Chargers and the NFL have with San Diego’s plans to build a Chargers stadium in Mission Valley is how it will be financed and the timing of getting such a massive project entitled.

Unless the NFL puts off Los Angeles for another year – highly unlikely at this point – San Diego has six months or so to come up with a stadium plan that can be suitably financed and fits the needs of the Chargers.

That seems an incredibly daunting, especially considering the Mission Valley stadium is tied to a bigger development of which time-consuming entitlements might cause long delays.

The Chargers and the NFL don’t have that kind of time – not with the Rams eyeing Inglewood and everything moving to a resolution by the beginning of 2016.

There is still time, but it’s running out.

Grubman, incidentally, is in Oakland today meeting with city and county leaders for a new Raiders stadium.