An electronic timepiece for enabling the user to easily change daylight saving time implementation rules includes a memory, a location information setting device, a time display, a daylight saving time switch, and a controller. The memory is configured to store location information, time zones, and daylight saving time rules. The location information setting device is configured to set location information. The time display is configured to display time based on the time zone and daylight saving time rule corresponding to the location information set by the location information setting device. The daylight saving time switch is configured to turn a daylight saving time mode on (implemented) and off (not implemented). The controller is configured to correct daylight saving time rules based on the timing when the daylight saving time switch was operated to change the daylight saving time mode on or off.

A timepiece including a timepiece movement and sunrise and sunset indicating device that take account of the date and geolocation of the user, the device including a first device for receiving the current date, a second device for receiving a geolocation signal, and a disc bearing a representation of the sun, arranged to be capable of pivoting about an axis passing through the centre of the disc. The sunrise and sunset indicating device include a movable horizon arranged to move above the disc and to indicate the position of the sun with respect to the horizon.

A time display device includes a display; an operation receiving unit that receives a selection operation of a city by a user; a memory that stores a time piece image and a map image including a plurality of city locations; and a processor, wherein said processor performs: reading out the time piece image and said map image from the memory; identifying one of the city locations in the map image read from the memory as corresponding to a location of the selected city; generating a display image by overlapping the map image including said identified one of the city locations and the timepiece image that is adjusted to indicate a local time of the selected city such that a center of the timepiece image coincides with said identified one of the city locations in the map image; and causing said display image to be displayed on the display.

Exemplary arrangements relate to a universal world timepiece such as a clock having a movement (11) in connection with indicators such as hands (16, 18, 20). The timepiece includes a stationary oriented 24-hour clock face (101, 301, 401, 501) including hour marks for each hour, and a dial (103, 303, 403, 503) which is movable relative to the 24-hour clock face. The example dial has a unique icon such as a different Latin letter for each hour of the 24 hours. A computer (10) of the timepiece may operate to determine geographic coordinates and/or or to receive wireless time signals and to determine the time zone in which the timepiece is currently located. The computer operates to cause the dial to be rotatably positioned responsive to the time zone determination, to cause a particular icon to be linearly aligned with a particular hour mark of the clock face. The arrangement enables a time in a designated time zone such as world time to be read, along with the local time and enables users in various time zones with clocks including such dials to set a future appointment at the same real time through designation of an icon.

A method (P1) for coding a solar time, called the initial solar time (Hs1), associated with a geographical location (Loc) and with a day (J1) of the year, wherein the method includes selecting SEL(Href, Nb1) a reference time (Href) and an initial number of bits (Nb1) as a function of the type of initial solar time (Hs), computing CALC(Nm1) a number of minutes (Nm1) separating the initial solar time (Hs1) and the reference time (Href), coding COD(Hs1) the number of minutes (Nm1) in the initial number of bits (Nb1).

A method for permutation of a time display mode of an electronic watch with an analogue display, including, after manipulation of a control member of the watch, a permutation of the position of main time indicating means of the watch, such that the device changes from indicating a first time to indicating a second time, the position of secondary time indicating device of the watch, such that the device changes from indicating the second time to indicating the first time, the position of an analogue time display mode indicator of the watch, such that the indicator changes from a first position characteristic of the first mode to a second position characteristic of the second mode.

A photoelectric converter including a crystalline silicon substrate having a light receiving surface including a smooth section and a rough surface section having surface roughness greater than the surface roughness of the smooth section and a light transmissive inorganic film so provided as to overlap with the smooth section and the rough surface section, and the film thickness t1 of a portion of the inorganic film that is the portion where the inorganic film overlaps with the rough surface section is smaller than the film thickness t2 of a portion of the inorganic film that is the portion where the inorganic film overlaps with the smooth section. The arithmetic average roughness of the rough surface section is preferably greater than or equal to 0.1 m.

Methods, systems, apparatuses, and computer program products are provided for enabling devices to determine the time zone in which they are located. A mobile device may receive location information from one or more sources. Based thereon, the current location of the mobile device may be determined in terms of latitude and longitude. The indication of the current location may be converted to an index value according to a Hilbert curve (or other space-filling curve), and the index value applied to a time zone index file to determine the local time zone. A time zone setting of the mobile device may be updated accordingly. Furthermore, geofencing may be used by the mobile device to detect movement towards and through a time zone boundary, leading to a new time zone determination being initiated.

Exemplary arrangements relate to a universal world timepiece such as a clock having a movement (11) in connection with indicators such as hands (16, 18, 20). The timepiece includes a stationary oriented 24-hour clock face (101, 301, 401, 501) including hour marks for each hour, and a dial (103, 303, 403, 503) which is movable relative to the 24-hour clock face. The example dial has a unique icon such as a different Latin letter for each hour of the 24 hours. A computer (10) of the timepiece may operate to determine geographic coordinates and/or or to receive wireless time signals and to determine the time zone in which the timepiece is currently located. The computer operates to cause the dial to be rotatably positioned responsive to the time zone determination, to cause a particular icon to be linearly aligned with a particular hour mark of the clock face. The arrangement enables a time in a designated time zone such as world time to be read, along with the local time and enables users in various time zones with clocks including such dials to set a future appointment at the same real time through designation of an icon.

A method for permutation of a time display mode of an electronic watch with an analogue display, including, after manipulation of a control member of the watch, a permutation of the position of main time indicating means of the watch, such that the device changes from indicating a first time to indicating a second time, the position of secondary time indicating device of the watch, such that the device changes from indicating the second time to indicating the first time, the position of an analogue time display mode indicator of the watch, such that the indicator changes from a first position characteristic of the first mode to a second position characteristic of the second mode.