diff --git a/src/lib/ae_events_stores.ts b/src/lib/ae_events_stores.ts
index 19263be1..1fc0b360 100644
--- a/src/lib/ae_events_stores.ts
+++ b/src/lib/ae_events_stores.ts
@@ -117,7 +117,9 @@ let events_local_data_struct: key_val = {
         show_content__presentation_code: true,
         show_content__presenter_code: true,
 
-        time_format: 'time_us_short', // 'time_short', 'time_us_short'
+        datetime_format: 'datetime_12_long',
+        time_format: 'time_12_short',
+        time_hours: 12, // 12 or 24
 
         slct: {
             event_id: null,
@@ -179,6 +181,10 @@ let events_local_data_struct: key_val = {
 
     // Presentation Management (Distributing)
     'pres_mgmt': {
+        datetime_format: 'datetime_12_long',
+        time_format: 'time_12_short',
+        time_hours: 12, // 12 or 24
+
         qry_enabled: 'enabled', // all, disabled, enabled
         qry_hidden: 'not_hidden', // all, hidden, not_hidden
         qry_limit__files: 75,
@@ -232,7 +238,7 @@ let events_local_data_struct: key_val = {
         show_report__presenters_agree: false,
         show_report__recent_files: false,
 
-        // time_format: 'time_us_short', // 'time_short', 'time_us_short'
+        // time_format: 'time_12_short', // 'time_short', 'time_12_short'
 
         disable_submit__opt_out: true,
         submit_status__opt_out: null,
diff --git a/src/lib/ae_utils__datetime_format.ts b/src/lib/ae_utils__datetime_format.ts
index d08e32b0..51c871f3 100644
--- a/src/lib/ae_utils__datetime_format.ts
+++ b/src/lib/ae_utils__datetime_format.ts
@@ -3,6 +3,7 @@ import dayjs from 'dayjs';
 export let iso_datetime_formatter = function iso_datetime_formatter(
     raw_datetime: null|string|Date = null,
     named_format: string = 'datetime_iso_no_seconds', // date_iso, datetime_iso_no_seconds
+    time_24_hours: boolean = false
     ) {
     // console.log('*** iso_datetime_formatter() ***');
 
@@ -22,7 +23,7 @@ export let iso_datetime_formatter = function iso_datetime_formatter(
     // datetime_iso_12_short 'YY-MM-DD hh:mm A'
     // datetime_iso_tz 'YYYY-MM-DD HH:mm:ss'
 
-    // datetime_us_no_seconds 'YYYY-MM-DD hh:mm A'
+    // datetime_12_no_seconds 'YYYY-MM-DD hh:mm A'
 
     // datetime_long 'dddd, MMMM D, YYYY hh:mm:ss A'
     // datetime_medium 'ddd, MMM D, YYYY hh:mm:ss A'
@@ -62,16 +63,25 @@ export let iso_datetime_formatter = function iso_datetime_formatter(
         case 'datetime_iso_12_short_month':
             datetime_string = dayjs(raw_datetime).format('MM-DD hh:mm A');
             break;
-        case 'datetime_us_no_seconds':
+        case 'datetime_12_no_seconds':
             datetime_string = dayjs(raw_datetime).format('YYYY-MM-DD hh:mm A');
             break;
         case 'datetime_short':
+            datetime_string = dayjs(raw_datetime).format('MMM D, YY HH:mm');
+            break;
+        case 'datetime_12_short':
             datetime_string = dayjs(raw_datetime).format('MMM D, YY hh:mm A');
             break;
         case 'datetime_medium':
+            datetime_string = dayjs(raw_datetime).format('MMM D, YYYY H:mm');
+            break;
+        case 'datetime_12_medium':
             datetime_string = dayjs(raw_datetime).format('MMM D, YYYY h:mm A');
             break;
         case 'datetime_long':
+            datetime_string = dayjs(raw_datetime).format('MMMM D, YYYY HH:mm');
+            break;
+        case 'datetime_12_long':
             datetime_string = dayjs(raw_datetime).format('MMMM D, YYYY hh:mm A');
             break;
         case 'datetime_short_month':
@@ -116,10 +126,10 @@ export let iso_datetime_formatter = function iso_datetime_formatter(
         case 'time_short_no_leading':
             datetime_string = dayjs(raw_datetime).format('H:mm');
             break;
-        case 'time_us_short':
+        case 'time_12_short':
             datetime_string = dayjs(raw_datetime).format('hh:mm A');
             break;
-        case 'time_us_short_no_leading':
+        case 'time_12_short_no_leading':
             datetime_string = dayjs(raw_datetime).format('h:mm A');
             break;
         case 'week_long':
diff --git a/src/lib/element_manage_event_file_li.svelte b/src/lib/element_manage_event_file_li.svelte
index ffe905aa..a54e3320 100644
--- a/src/lib/element_manage_event_file_li.svelte
+++ b/src/lib/element_manage_event_file_li.svelte
@@ -540,14 +540,14 @@ onMount(() => {
                 </strong>
                 {ae_util.iso_datetime_formatter(event_file_obj.created_on, 'date_iso')}
                 at
-                <strong>{ae_util.iso_datetime_formatter(event_file_obj.created_on, 'time_us_short_no_leading')}</strong>
+                <strong>{ae_util.iso_datetime_formatter(event_file_obj.created_on, 'time_12_short_no_leading')}</strong>
                 <!-- {event_file_obj.updated_on} -->
              {:else}
                 <!-- <span class="fas fa-calendar-day mx-1"></span> -->
                 <strong>
                 {ae_util.iso_datetime_formatter(event_file_obj.created_on, 'date_short')}
                 <!-- at -->
-                <strong>{ae_util.iso_datetime_formatter(event_file_obj.created_on, 'time_us_short_no_leading')}</strong>
+                <strong>{ae_util.iso_datetime_formatter(event_file_obj.created_on, 'time_12_short_no_leading')}</strong>
                 </strong>
             {/if}
         </span>
diff --git a/src/routes/core/ae_comp__person_obj_tbl.svelte b/src/routes/core/ae_comp__person_obj_tbl.svelte
index 31b2c5b4..4f6f6df3 100644
--- a/src/routes/core/ae_comp__person_obj_tbl.svelte
+++ b/src/routes/core/ae_comp__person_obj_tbl.svelte
@@ -122,9 +122,9 @@ let lq_kv__person_obj_li = liveQuery(
             {/if}
 
             <td class="px-4 py-2">
-                {ae_util.iso_datetime_formatter(person_obj?.created_on, 'datetime_us_no_seconds')}
+                {ae_util.iso_datetime_formatter(person_obj?.created_on, 'datetime_12_no_seconds')}
                 <br>
-                {ae_util.iso_datetime_formatter(person_obj?.updated_on, 'datetime_us_no_seconds')}
+                {ae_util.iso_datetime_formatter(person_obj?.updated_on, 'datetime_12_no_seconds')}
             </td>
         </tr>
     {/each}
diff --git a/src/routes/events_leads/exhibit/[slug]/leads_manage.svelte b/src/routes/events_leads/exhibit/[slug]/leads_manage.svelte
index 667e401f..14b4ad91 100644
--- a/src/routes/events_leads/exhibit/[slug]/leads_manage.svelte
+++ b/src/routes/events_leads/exhibit/[slug]/leads_manage.svelte
@@ -82,7 +82,7 @@ $: if ($events_slct.exhibit_id) {
         </div>
         <div class="flex flex-row items-center space-x-2">
         <span class="ae_label">Started:</span>
-        <span class="ae_value">{ae_util.iso_datetime_formatter($events_loc.leads.auth_exhibit_kv[$events_slct.exhibit_id].updated_on, 'datetime_long')}</span>
+        <span class="ae_value">{ae_util.iso_datetime_formatter($events_loc.leads.auth_exhibit_kv[$events_slct.exhibit_id].updated_on, 'datetime_12_long')}</span>
         </div>
         </div>
 
diff --git a/src/routes/events_pres_mgmt/(launcher)/launcher/[slug]/launcher_session_view.svelte b/src/routes/events_pres_mgmt/(launcher)/launcher/[slug]/launcher_session_view.svelte
index d95e0323..58b0ddc6 100644
--- a/src/routes/events_pres_mgmt/(launcher)/launcher/[slug]/launcher_session_view.svelte
+++ b/src/routes/events_pres_mgmt/(launcher)/launcher/[slug]/launcher_session_view.svelte
@@ -145,23 +145,24 @@ ae_promises[$events_loc.launcher.slct.event_session_id] = events_func.load_ae_ob
                 class="event_session_datetimes"
                 >
                 <button
+                    type="button"
                     on:click={() => {
-                        if ($events_loc.launcher.time_format == 'time_us_short') {
+                        if ($events_loc.launcher.time_format == 'time_12_short') {
                             $events_loc.launcher.time_format = 'time_short';
                         } else {
-                            $events_loc.launcher.time_format = 'time_us_short';
+                            $events_loc.launcher.time_format = 'time_12_short';
                         }
                     }}
                     >
-                <strong>{ae_util.iso_datetime_formatter($lq__event_session_obj.start_datetime, 'week_long')}</strong>
-                <span class="font-normal">
-                    {ae_util.iso_datetime_formatter($lq__event_session_obj.start_datetime, 'date_long_month_day')}
-                </span>
-                <strong>{ae_util.iso_datetime_formatter($lq__event_session_obj.start_datetime, $events_loc.launcher.time_format)}</strong>
-                <span class="font-normal">
-                    &ndash;
-                    {ae_util.iso_datetime_formatter($lq__event_session_obj.end_datetime, $events_loc.launcher.time_format)}
-                </span>
+                    <strong>{ae_util.iso_datetime_formatter($lq__event_session_obj.start_datetime, 'week_long')}</strong>
+                    <span class="font-normal">
+                        {ae_util.iso_datetime_formatter($lq__event_session_obj.start_datetime, 'date_long_month_day')}
+                    </span>
+                    <strong>{ae_util.iso_datetime_formatter($lq__event_session_obj.start_datetime, $events_loc.launcher.time_format)}</strong>
+                    <span class="font-normal">
+                        &ndash;
+                        {ae_util.iso_datetime_formatter($lq__event_session_obj.end_datetime, $events_loc.launcher.time_format)}
+                    </span>
                 </button>
             </h3>
             <h2 class="text-xl">
@@ -314,7 +315,7 @@ ae_promises[$events_loc.launcher.slct.event_session_id] = events_func.load_ae_ob
                     <div class="event_presentation_datetime_name flex flex-row justify-evenly gap-4">
                         <!-- <div class="event_presentation_datetime_name"> -->
                             {#if event_presentation_obj?.start_datetime}
-                                <span class="event_presentation_datetime"><strong>{ae_util.iso_datetime_formatter(event_presentation_obj?.start_datetime, 'time_us_short_no_leading')}</strong></span>
+                                <span class="event_presentation_datetime"><strong>{ae_util.iso_datetime_formatter(event_presentation_obj?.start_datetime, 'time_12_short_no_leading')}</strong></span>
                             {/if}
 
                             <span class="event_presentation_name grow">{event_presentation_obj?.name}</span>
diff --git a/src/routes/events_pres_mgmt/ae_comp__event_file_obj_tbl.svelte b/src/routes/events_pres_mgmt/ae_comp__event_file_obj_tbl.svelte
index 19532537..ee5192e3 100644
--- a/src/routes/events_pres_mgmt/ae_comp__event_file_obj_tbl.svelte
+++ b/src/routes/events_pres_mgmt/ae_comp__event_file_obj_tbl.svelte
@@ -186,7 +186,7 @@ let lq_kv__event_file_obj_li = liveQuery(
                 </span>
             </div>
                 <span>
-                {ae_util.iso_datetime_formatter(event_file_obj?.created_on, 'time_us_short')}
+                {ae_util.iso_datetime_formatter(event_file_obj?.created_on, 'time_12_short')}
                 </span>
             </td>
             {#if show_location_fields}
@@ -210,7 +210,7 @@ let lq_kv__event_file_obj_li = liveQuery(
                     {event_file_obj?.event_session_name}
                 </a>
             </td>
-            <td class="px-4 py-2">{ae_util.iso_datetime_formatter(event_file_obj?.event_session_start_datetime, 'datetime_us_no_seconds')}</td>
+            <td class="px-4 py-2">{ae_util.iso_datetime_formatter(event_file_obj?.event_session_start_datetime, 'datetime_12_no_seconds')}</td>
             {/if}
             {#if show_presentation_fields}
             <td class="px-4 py-2 lg:text-xs">
@@ -222,7 +222,7 @@ let lq_kv__event_file_obj_li = liveQuery(
             </td>
             <td class="px-4 py-2">
                 {#if event_file_obj?.event_presentation_id_random}
-                {ae_util.iso_datetime_formatter(event_file_obj?.event_presentation_start_datetime, 'time_us_short')}
+                {ae_util.iso_datetime_formatter(event_file_obj?.event_presentation_start_datetime, 'time_12_short')}
                 {:else}
                     {@html ae_snip.html__not_set}
                 {/if}
diff --git a/src/routes/events_pres_mgmt/ae_comp__event_presenter_obj_tbl.svelte b/src/routes/events_pres_mgmt/ae_comp__event_presenter_obj_tbl.svelte
index cf76b375..467a0b6e 100644
--- a/src/routes/events_pres_mgmt/ae_comp__event_presenter_obj_tbl.svelte
+++ b/src/routes/events_pres_mgmt/ae_comp__event_presenter_obj_tbl.svelte
@@ -116,15 +116,15 @@ let lq_kv__event_presenter_obj_li = liveQuery(
                 {event_presenter_obj?.event_session_name}
                 </a>
             </td>
-            <td class="px-4 py-2 text-sm">{ae_util.iso_datetime_formatter(event_presenter_obj?.event_session_start_datetime, 'datetime_us_no_seconds')}</td>
+            <td class="px-4 py-2 text-sm">{ae_util.iso_datetime_formatter(event_presenter_obj?.event_session_start_datetime, 'datetime_12_no_seconds')}</td>
             {/if}
 
             {#if show_presentation_fields}
             <td class="px-4 py-2 lg:text-xs">{event_presenter_obj?.event_presentation_name}</td>
-            <td class="px-4 py-2 lg:text-xs">{ae_util.iso_datetime_formatter(event_presenter_obj?.event_presentation_start_datetime, 'time_us_short')}</td>
+            <td class="px-4 py-2 lg:text-xs">{ae_util.iso_datetime_formatter(event_presenter_obj?.event_presentation_start_datetime, 'time_12_short')}</td>
             {/if}
 
-            <td class="px-4 py-2 text-sm">{ae_util.iso_datetime_formatter(event_presenter_obj?.updated_on, 'datetime_us_no_seconds')}</td>
+            <td class="px-4 py-2 text-sm">{ae_util.iso_datetime_formatter(event_presenter_obj?.updated_on, 'datetime_12_no_seconds')}</td>
 
         </tr>
     {/each}
diff --git a/src/routes/events_pres_mgmt/ae_comp__event_session_obj_li.svelte b/src/routes/events_pres_mgmt/ae_comp__event_session_obj_li.svelte
index 06208a82..aa66d394 100644
--- a/src/routes/events_pres_mgmt/ae_comp__event_session_obj_li.svelte
+++ b/src/routes/events_pres_mgmt/ae_comp__event_session_obj_li.svelte
@@ -215,13 +215,13 @@ let lq_kv__event_session_obj_li = liveQuery(
         <span class="flex flex-col items-center md:flex-row md:items-start md:text-center max-w-36">
             {#if session_obj?.start_datetime}
             <span style="break-inside: avoid;">
-                {ae_util.iso_datetime_formatter(session_obj?.start_datetime,'time_us_short')}
+                {ae_util.iso_datetime_formatter(session_obj?.start_datetime,'time_12_short')}
             </span>
             <span class="grow">
             &ndash;
             </span>
             <span style="break-inside: avoid;">
-                {ae_util.iso_datetime_formatter(session_obj?.end_datetime,'time_us_short')}
+                {ae_util.iso_datetime_formatter(session_obj?.end_datetime,'time_12_short')}
             </span>
             {:else}
             {@html ae_snip.html__not_set}
diff --git a/src/routes/events_pres_mgmt/ae_comp__event_session_obj_li_v2.svelte b/src/routes/events_pres_mgmt/ae_comp__event_session_obj_li_v2.svelte
index 14de5097..253f1562 100644
--- a/src/routes/events_pres_mgmt/ae_comp__event_session_obj_li_v2.svelte
+++ b/src/routes/events_pres_mgmt/ae_comp__event_session_obj_li_v2.svelte
@@ -209,13 +209,13 @@ if (browser) {
         <span class="flex flex-col items-center md:flex-row md:items-start md:text-center max-w-36">
             {#if session_obj?.start_datetime}
             <span style="break-inside: avoid;">
-                {ae_util.iso_datetime_formatter(session_obj?.start_datetime,'time_us_short')}
+                {ae_util.iso_datetime_formatter(session_obj?.start_datetime,'time_12_short')}
             </span>
             <span class="grow">
             &ndash;
             </span>
             <span style="break-inside: avoid;">
-                {ae_util.iso_datetime_formatter(session_obj?.end_datetime,'time_us_short')}
+                {ae_util.iso_datetime_formatter(session_obj?.end_datetime,'time_12_short')}
             </span>
             {:else}
             {@html ae_snip.html__not_set}
diff --git a/src/routes/events_pres_mgmt/ae_comp__event_session_obj_tbl.svelte b/src/routes/events_pres_mgmt/ae_comp__event_session_obj_tbl.svelte
index 3a14346b..d5ab976d 100644
--- a/src/routes/events_pres_mgmt/ae_comp__event_session_obj_tbl.svelte
+++ b/src/routes/events_pres_mgmt/ae_comp__event_session_obj_tbl.svelte
@@ -87,7 +87,7 @@ let lq_kv__event_session_obj_li = liveQuery(
                 </a>
             </td>
             <td class="px-4 py-2">
-                {ae_util.iso_datetime_formatter(event_session_obj?.start_datetime, 'datetime_us_no_seconds')}
+                {ae_util.iso_datetime_formatter(event_session_obj?.start_datetime, 'datetime_12_no_seconds')}
             </td>
             <td class="px-4 py-2">
                 {event_session_obj?.event_location_name}
diff --git a/src/routes/events_pres_mgmt/session_view.svelte b/src/routes/events_pres_mgmt/session_view.svelte
index 4179409b..c598f08a 100644
--- a/src/routes/events_pres_mgmt/session_view.svelte
+++ b/src/routes/events_pres_mgmt/session_view.svelte
@@ -252,7 +252,22 @@ $: if ($lq__event_session_obj) {
             }}
             >
             {ae_util.iso_datetime_formatter($lq__event_session_obj.start_datetime, 'dddd')},
-            {ae_util.iso_datetime_formatter($lq__event_session_obj.start_datetime, 'datetime_long')}
+            <button
+                type="button"
+                on:click={() => {
+                    if ($events_loc.launcher.time_hours == 12) {
+                        $events_loc.launcher.time_hours = 24;
+                        $events_loc.launcher.datetime_format = 'datetime_long';
+                        $events_loc.launcher.time_format = 'time_short';
+                    } else {
+                        $events_loc.launcher.time_hours = 12;
+                        $events_loc.launcher.datetime_format = 'datetime_12_long';
+                        $events_loc.launcher.time_format = 'time_12_short';
+                    }
+                }}
+                >
+                {ae_util.iso_datetime_formatter($lq__event_session_obj.start_datetime, $events_loc.launcher.datetime_format)}
+            </button>
         </Element_ae_crud>
         -
         <Element_ae_crud
@@ -279,7 +294,7 @@ $: if ($lq__event_session_obj) {
                 // $events_trig_kv['event_session_id'] = $lq__event_session_obj?.event_session_id_random;
             }}
             >
-            {ae_util.iso_datetime_formatter($lq__event_session_obj.end_datetime, 'time_us_short')}
+            {ae_util.iso_datetime_formatter($lq__event_session_obj.end_datetime, $events_loc.launcher.time_format)}
         </Element_ae_crud>
     </li>
     <li>