ENJuly 9, 2026Mikail Aslan

NH35 vs NH36: the only difference is the day

The NH36A adds a day wheel. The compared TMI specifications match: 27.40 mm, 21,600 vph, 24 jewels, more than 41 hours. Pick by dial layout, not by calibre.

Updated: October 13, 2026

Last fact-checked: October 9, 2026

The documented difference between the NH35A and NH36A is smaller than many online comparisons suggest. The NH35A displays the date. The NH36A displays the day and date. Time Module (TMI) lists the same main dimensions and performance specifications for both.

Sources last checked on 9 October 2026. This article compares published manufacturer data. It is not an in-house laboratory test.

Short answer

NH35A: three hands, date and quick date correction.
NH36A: three hands, day plus date and quick day/date correction.
Both: automatic and manual winding, stop-second mechanism, 21,600 vibrations per hour (3 Hz), 24 jewels and more than 41 hours of running time when fully wound, according to TMI.

The practical choice is therefore not which calibre is universally "better". It is which calendar display the dial and the complete build require.

Manufacturer specifications compared

Field	NH35A	NH36A
Display	3 hands + date	3 hands + day and date
Automatic winding	Yes, ball bearing	Yes, ball bearing
Manual winding	Yes	Yes
Stop-second mechanism	Yes	Yes
Quick correction	Date	Day and date
Frequency	21,600 bph (3 Hz)	21,600 bph (3 Hz)
Jewels	24	24
Running time	More than 41 hours	More than 41 hours
Stated static accuracy	-20 to +40 seconds/day	-20 to +40 seconds/day
Outside diameter	27.40 mm	27.40 mm
Casing diameter with dial holding spacer	29.36 mm	29.36 mm
Total height	5.32 mm	5.32 mm

The individual NH35A/NH36A specification sheets from 2022 state 23 ± 2 °C and a 20-second measurement for static accuracy. Separately, the 2025 NH3 guide describes testing 10–60 minutes after full winding in the dial-up, 9-up and 6-up positions, without an active calendar function; it gives no temperature condition. This manufacturer range is not a timing record for a finished watch.

Choose by the display you will use

Choose NH35A for a date dial, or NH36A when you also want to read the weekday. The MARINER MOD – BLACK uses NH35 and displays the date, making it a concrete date-only example. For a day-date project, match the actual movement, day-wheel language and calendar opening.

What the calendar difference means

On the NH35A, the first crown click adjusts the date. On the NH36A, turning the crown in one direction adjusts the date and turning it in the other adjusts the day. TMI warns not to set the date on either the NH35A or NH36A between 9 p.m. and 4 a.m. The cited wording concerns date correction and does not support a blanket claim about day-wheel correction.

For a build, this means:

The dial needs the appropriate calendar opening.
Movement, dial, hands, holder, case and crown position must be checked as one system.
Matching outside dimensions alone do not prove that two specific part combinations are interchangeable without further checks.

An NH36A may sit behind a dial that hides the day display, but the extra function then provides no visible benefit. An NH35A cannot display a day of the week.

What the documents do not establish

Price differences, accuracy results and the prevalence of the calibres at repair shops depend on supplier, batch, assembly, regulation and measurement conditions.

The calibre name alone also does not establish the origin of a particular unit. TMI lists Japan or Malaysia for the NH35/NH36 line.

Sources and open data

The CSV contains only fields traceable to the linked TMI material, including source URL and verification date. It does not replace a compatibility check for a specific watch build.

For more context, see our NH35 movement overview. If you do not want to combine components yourself, the configurator shows the available options.

For measured results, see the automatic-watch accuracy guide. If day and date are part of the purchase decision, the day-date mod buying checklist is the next guide.