TZplus2 - a Pebble watchapp that displays 3 selectable timezones

[ SDK 2.0 compatible version ]

NOTE: to allow full use of the buttons, TZplus2 loads as an app (at the same menu level as "Settings" on the Pebble), not as a watchface . . . it just displays a watchface

Features (v2.2):

• select and display three timezones, plus local time, selectable on-the-fly (no recompile required) from a picklist of locations and timezones
• toggle between showing timezone #1 & local time in upper time slot
• uses local time to determine offset from UTC on all displays
• displays nighttime as white characters on black background & daytime as black characters on white background
• displays +/- 1 to indicate that a particular timezone display is 1-day ahead or 1-day behind UTC
• displays 12/24 hour format time (using current Pebble Settings)
• preference settings are maintained in persistent storage

Operating instructions:

• to turn backlight on/off (automatically turns off after 4-seconds), either press "select" (middle) button, or tap/shake
• to toggle between local time and timezone 1 display in the upper slot, double-click the "select" button (when "set mode" is NOT active)
• to enter "set mode" (local), long-press the "select" (middle) button (upper slot displays local time, blinks "LOCAL" for 2-seconds, then the currently selected local timezone blinks)
• with "set mode" on "local", press the "up" & "down" buttons to change the local timezone (note that the hour & minute displayed for local time may temporarily change for a second, but will then return since this time corresponds to either the time sync'd from your phone or the time set in the Pebble's Settings: Date & Time menu)
• to change "set mode" to "timezone 1", press the "select" button (upper slot displays timezone 1 time, blinks "TIMEZONE 1" for 2-seconds, then the currently selected timezone 1 blinks)
• with "set mode" on "timezone 1", press the "up" & "down" buttons to change timezone 1 (note that the time for timezone 1 will adjust in sync with the selected timezone to reflect the offset from UTC, taking into consideration the local offset from UTC selected earlier)
• to change "set mode" to "timezone 2", press the "select" button (the currently selected timezone 2 blinks in the middle slot)
• with "set mode" on "timezone 2", press the "up" & "down" buttons to change timezone 2 (note that the time for timezone 2 will adjust in sync with the selected timezone to reflect the offset from UTC, taking into consideration the local offset from UTC selected earlier)
• to change "set mode" to "timezone 3", press the "select" button (the currently selected timezone 3 blinks in the lower slot)
• with "set mode" on "timezone 3", press the "up" & "down" buttons to change timezone 3 (note that the time for timezone 3 will adjust in sync with the selected timezone to reflect the offset from UTC, taking into consideration the local offset from UTC selected earlier)
• to change "set mode" to "local", press the "select" button (upper slot displays local time, blinks "LOCAL" for 2-seconds, then the currently selected local timezone blinks)
• to exit "set mode" at anytime, long-press the "select" button (nothing blinking)

Mark J Culross (KD5RXT) mjculross@sbcglobal.net