TSD Rally Split Clock and Stopwatch

The TSD Rally Split consists of two clocks with different purposes. Master•Time on the left is the rally time-of-day clock. This clock can be adjusted to synchronize with the Official Rally Time clock. Also, the Master•Time clock can be stopped by touching the button on the left side. Retouching the button will cause the digital clock display to resume tracking time-of-day.

Monte•Carlo on the right is a stopwatch with two buttons: one starts and resumes the stopwatch and the other records each lap.

When the stopwatch has been stopped, there are two options for resetting it to zero after the stopwatch. One option is to reset to zero upon clicking the rightmost button beneath the stopwatch. The other option is to have the stopwatch reset when the time-of-day clock begins the next minute.

Touch the Lock icon 🔒 to make clock adjustments. Adjust time ahead or behind as needed and, when finished, touch the Unlock icon 🔓 to prevent unintended adjustments. Touch the double Arrows ⏫ ⏬ singly or continuously to make adjustments in +/– 0.1 second increments.

When unlocked a chime will sound at 0 seconds and at 30 seconds. This audible cue is helpful when synching with the Official Rally Clock.

When the Official Rally Clock’s second hand reaches zero, the start of a new minute, estimate the error by which your clock is behind or ahead of the Official time and add or subtract 0.1 second increments.

On the clockface displays, time can be measured in either seconds or decimal minutes. Additionally, there are two levels of time precision. One displays two digits for seconds or two digits for hundredths of a minute. For more precision, the other measures and displays seconds as two digits plus tenths of a second or three digits for thousandths of a minute.


changes in version 3.0
  • Numerous changes and simplifications to the app code
  • GUI tweaks
  • Audible clicks counting down to starting the stopwatch at the next minute.
change in version 2.5
  • Activation of all buttons now take place upon "touch down" rather than "touch up inside" for faster, more accurate execution
changes in version 2.3
  • Fixed bug that caused time to be limited to two digits of minutes or decimal minutes in some countries
  • Changed the default clock measurement to the 24-hour convention
changes in version 2.0
  • Improved reset functions and added another option to reset when the minute hand on the Time-Of-Day clock reaches zero
  • Placed adjustment functions in a popup view
  • Relocated the time measurement options to a popup view along with time precision options
  • Other GUI modifications
  • Added descriptive labels to clock buttons
  • Clock button colors changed for consistency between clock and stopwatch

revised: June 20, 2016