display watch or digital clock

Just for an OOTB example, I implemented something for a similar requirement with a!gaugeField() for a countdown timer in a Meeting Minute type app:

/* rule inputs are datetime */

a!localVariables(
  local!notSet: or(
    rule!APN_isEmpty(ri!start),
    rule!APN_isEmpty(ri!end),
    rule!APN_isEmpty(ri!current),
    ri!current<ri!start
  ),
  local!hours: if(local!notSet,0,hour(tointervalds(ri!end-ri!start))),
  local!minutes: if(local!notSet,0,minute(tointervalds(ri!end-ri!start))),
  local!duration: if(local!notSet,0,(local!hours*60)+local!minutes),
  local!curHoursIn: if(local!notSet,0,hour(tointervalds(ri!current-ri!start))),
  local!curMinutesIn: if(local!notSet,0,minute(tointervalds(ri!current-ri!start))),
  local!durationIn: if(local!notSet,0,(local!curHoursIn*60)+local!curMinutesIn),
  local!remainingMinutes: if(local!notSet,0,if(local!durationIn>local!duration,0,local!duration-local!durationIn)),
  local!pct: if(local!notSet,0,trunc((local!durationIn/local!duration)*100,0)),

  {
    a!gaugeField(
      labelPosition: "COLLAPSED",
      percentage: local!pct,
      primaryText: if(local!notSet,"---",local!remainingMinutes),
      secondaryText: "mins remain",
      color: rule!MM_getGaugeColorForPct(
        pct: local!pct,
        notSet: local!notSet
      ),
      size: "MEDIUM",
      align: "CENTER",
    )
  }
)

Helper rule!MM_getGaugeColorForPct() (this could be optimized..):

if(
  ri!notSet,
  "#afafaf",
  if(
    ri!pct < 20,
    "#008000",
    if(
      and(
        ri!pct >= 20,
        ri!pct < 40
      ),
      "#a4d100",
      if(
        and(
          ri!pct >= 40,
          ri!pct < 60
        ),
        "#f9fc00",
        if(
          and(
            ri!pct >= 60,
            ri!pct < 80
          ),
          "#ff8500",
          if(
            ri!pct >= 80,
            "#ff0500",
            "#afafaf"
          )
        )
      )
    )
  )
)

Could not display interface. Please check definition and inputs. Interface Definition: Expression evaluation error at function 'trunc' parameter 1 [line 16]: Invalid division: Denominator may not be zero (0)

it is not working its giving me this error

The error is pretty clear. What problem are you facing in resolving this?

The error is pretty clear. What problem are you facing in resolving this?