The platinum Rolex Day-Date 40 ref. 228236 and Day-Date 36 ref. 128236 share the same movement and core specifications; their clearest stated difference is case diameter: 40 mm versus 36 mm. Rolex lists both with a fluted bezel, a platinum President bracelet, calibre 3255, approximately 70 hours of power reserve and 100 m water resistance. This is a specifications-based comparison, not a hands-on wear review.
Rolex Day-Date 228236 vs. 128236: what changes?
Reference 228236 is the platinum Day-Date 40, while 128236 is the platinum Day-Date 36. Rolex’s specifications show the same movement, stated power reserve, water resistance, bezel style and bracelet design for both. The primary established distinction is the size of the case.
| Specification | Day-Date 40 ref. 228236 | Day-Date 36 ref. 128236 |
|---|---|---|
| Case diameter | 40 mm | 36 mm |
| Case and bracelet material | Platinum | Platinum |
| Bezel | Fluted | Fluted |
| Bracelet | President bracelet with semi-circular three-piece links and concealed Crownclasp | President bracelet with semi-circular three-piece links and concealed Crownclasp |
| Movement | Calibre 3255, self-winding mechanical | Calibre 3255, self-winding mechanical |
| Stated power reserve | Approximately 70 hours | Approximately 70 hours |
| Stated water resistance | 100 m / 330 ft | 100 m / 330 ft |
These are Rolex’s published specifications, not independent test results. The measurements do not establish how either watch will fit or feel on an individual wrist.
What does the 4 mm case-size difference tell you?
The 228236 has a 40 mm case and the 128236 a 36 mm case. That gives a concrete starting point for choosing between the two, but diameter alone cannot determine wrist fit, visual presence, comfort or legibility. Rolex’s product listings provide no comparative wear assessment, so those questions are best resolved by trying each size on in person.
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Both use the same layout: the day appears in an aperture at 12 o’clock and the date at 3 o’clock, with a Cyclops lens over the date. The movement provides central hour, minute and seconds hands, instantaneous day and date displays, secure rapid-setting and stop-seconds.
Movement, case construction and performance specifications
Rolex specifies calibre 3255 for each reference and states precision of −2/+2 seconds per day after casing. The brand lists approximately 70 hours of power reserve. These figures are manufacturer specifications; they do not represent an independent accuracy test of individual watches.
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Both listings describe an Oyster case with a monobloc middle case, screw-down case back and winding crown, Twinlock double waterproofness system and scratch-resistant sapphire crystal. Rolex gives each watch a water-resistance rating of 100 m / 330 ft.
Dial choices include ice-blue, but are not limited to it
Rolex lists ice-blue dial configurations for both references, but the reviewed catalogue examples also include other colors and decorative treatments. Examples for ref. 228236 include white, slate, blue ombré, meteorite, mother-of-pearl and gem-set presentations. Examples for ref. 128236 include white, blue ombré, pink opal and gem-set presentations. These are examples of listed variants, not a complete or guaranteed-current inventory; availability may vary by market and change over time.
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For official product details, see the ice-blue Day-Date 40 ref. 228236 and the ice-blue Day-Date 36 ref. 128236. Rolex also lists examples such as the white mother-of-pearl 228236, diamond-paved 228236, meteorite 228236, pink opal 128236, diamond-paved 128236 and white mother-of-pearl 128236.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How much does a platinum Day-Date cost?
On the Rolex US product pages reviewed in 2026, the ice-blue ref. 228236 displayed a price of $68,800 USD and the ice-blue ref. 128236 displayed $64,100 USD. These are time-sensitive displayed prices for specific US configurations, not prices for every dial or market, proof of stock, or secondary-market transaction values.
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Other reviewed US listings showed higher displayed prices for particular configurations: $74,650 to $93,000 among sampled 228236 variants and $69,950 and $96,500 among sampled 128236 variants. Those figures are examples tied to specific dial configurations, not a comprehensive price range for either reference. Rolex’s listed prices do not establish resale value, a market premium or investment performance.
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Which reference should you consider?
- Consider the 228236 if the listed 40 mm case is the size you want and you prefer one of its currently offered dial configurations.
- Consider the 128236 if you want the 36 mm case and prefer one of its listed dial options.
- Try both on if fit and wrist presence are central to the decision; published diameter alone cannot settle them.
- Confirm the exact configuration with an official Rolex jeweler for current availability and pricing. Rolex says only official Rolex jewelers are permitted to sell and maintain Rolex watches.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
