heck/kubejs/client_scripts/time_in_a_bottle.js

// priority: 0

onEvent("item.tooltip", event => {
  const ItemDescription = java("com.simibubi.create.foundation.item.ItemDescription");
  const Palette         = java("com.simibubi.create.foundation.item.ItemDescription$Palette");

  event.addAdvanced("tiab:time_in_a_bottle", (item, advanced, tooltip) => {

    // Append time to the item's name.
    let storedTime = item.nbt.getInt("storedTime");
    if (storedTime > 0) {
      let totalSeconds = Math.floor(storedTime / 20);
      let totalMinutes = Math.floor(totalSeconds / 60)
      let totalHours   = Math.floor(totalMinutes / 60);

      let name = tooltip[0];
      name.append(" (");
      if (totalHours   > 0) name.append(`${totalHours}h`);
      if (totalMinutes > 0) name.append(`${totalMinutes % 60}m`);
      name.append(`${totalSeconds % 60}s)`);
    }

    // Remove "Stored time hh:mm:ss" line.
    // NOTE: This is a Java list, not a JavaScript(-like) one.
    tooltip.remove(1);

    // Add Create-style description and usage hint.
    new ItemDescription(Palette.Gray)
      .withSummary(Component.translate("item.tiab.time_in_a_bottle.tooltip.summary"))
      // Create expects localized strings instead of components here, so we localize ourselves
      .withControl(Component.translate("item.tiab.time_in_a_bottle.tooltip.condition").string,
        Component.translate("item.tiab.time_in_a_bottle.tooltip.behaviour").string)
      .createTabs()
      .addInformation(tooltip);

  });
});