Actually I have used my old passport till 2 weeks before it expired, with a 30 day stamp.
But did you travel by air? It seems to be primarily the airlines that look at the passport validity.
My friend with a British passport with 5.5 months went over the border to Poipet and was refused renetry into thailand. He had to stay in Cambodia for 3 weeks until he got a new passport. This happened last month
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6-month Passport Validity Requirement
in Thai Visas, Residency, and Work Permits
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My friend with a British passport with 5.5 months went over the border to Poipet and was refused renetry into thailand. He had to stay in Cambodia for 3 weeks until he got a new passport. This happened last month