Government spokesman Lieutenant General Sansern Kaewkumnerd said five days of funerary rites would begin on October 25, with the cremation on the second evening.
A public holiday will be declared that day.
Cremations for senior Thai royals are huge and costly affairs but few subjects alive today will ever have witnessed one.
At the time of his death on October 13 last year Bhumibol, 88, was the world's longest-reigning monarch.
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The monarchy is also shielded from any criticism by a draconian lese majeste law. It was used more frequently towards the end of Bhumibol's reign, especially after the 2014 coup.
While he had been ill for years, his passing still left many Thais bereft.
There have been huge displays of mourning and many choose to wear monochrome black or white clothing for the duration of the one-year official mourning period.
A huge cremation complex is being constructed on a parade ground specially reserved for royal funerals outside the Grand Palace in Bangkok.
Bhumibol's successor, King Maha Vajiralongkorn, is expected to hold his own coronation soon after the cremation.
He has yet to attain his father's widespread popularity and has made recent moves to consolidate his constitutional and behind-the-scenes powers.
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