display watch or digital clock

We need a little bit more to go on. Do you mean:

• the time of day?
• the elapsed time since something started?
• the remaining time you have left to finish something by?

In the meantime until Appian introduce the functionality, you can refresh the time after every 30 seconds by using refresh interval and show that time.

Maybe this is something you need - community.appian.com/.../real-time-clock-component-plug-in

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!currentlocal!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"
          )
        )
      )
    )
  )
)