Military "experts" (Chatham House, ex-top brass, etc) have said 2029 for war for a number of years. It's been arranged with the enemy after tiffin on the Riviera.
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The Guardian produced this many months ago! Recommended 72-Hour Survival Checklist
• Bottled Water: At least nine litres of water per person (roughly three litres per day for drinking, with extra recommended for cooking and washing).
• Non-Perishable Food: Tinned meat, fish, or vegetables, as well as dried fruit and nuts that do not require heating or boiling water.
• Battery-Powered or Wind-Up FM Radio: To receive emergency broadcasts and updates.
• Torch and Extra Batteries: For lighting if power fails.
• Charged Power Bank: To keep mobile devices and communication tools charged.
• First Aid Kit: Including waterproof plasters, bandages, antiseptic, a thermometer, and regular personal medications.
• Sanitisation Supplies: Hand sanitiser and wet wipes.
• Warmth and Shelter: Blankets and extra warm clothing.
• Cash: Physical money in case electronic payment systems or card networks collapse.
• Important Documents: Printed copies of passports, birth certificates, insurance policies, and emergency contact or medical instructions.
Baby and Pet Supplies: Dedicated food, water, and care items if you have infants or pets in the household.

I'll probably got all that ready by 2029. Might even afford some iodine for radioactivity - as suggested by James O'Brien on LBC this morning. I don't want a dodgy tummy after the bomb's gone off.
During the cold war they told everyone to hide under their kitchen table in case of a nuclear strike. Apparently these days bottled water is enough.
I don't know anyone who has said that they expect war explicitly start in 2029. That seems sort of arbitrary really, conflict in Ukraine is going badly now I can't see why it would be different in three years.
Why then do they all invariably give such a definite date rather than something like "next five years" or "next decade" or even other dates like "2028/2030/2031/2032"? Somewhere a decision has been made about this date. (Historically, we know that World War One, for instance, was actively planned and prepared for for a number of years before it happened.)
I don't think there is a plan to have a war, what would be the point? We have nukes now, it would be a plan for everyone to die.
Who knows? Drone war? Robots fighting? Wag the Dog-style fake war? Billionaires have built some deep bunkers in remote parts of the world.
In 2029 Trump will be out. Putin, if still alive, will have lost a major ally.