diff --git a/lib/fencing/st_output.c b/lib/fencing/st_output.c
index a8ccd6c2c9..af5b05e5c3 100644
--- a/lib/fencing/st_output.c
+++ b/lib/fencing/st_output.c
@@ -1,577 +1,596 @@
 /*
  * Copyright 2019-2022 the Pacemaker project contributors
  *
  * The version control history for this file may have further details.
  *
  * This source code is licensed under the GNU Lesser General Public License
  * version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
  */
 
 #include <crm_internal.h>
 #include <stdarg.h>
 #include <stdint.h>
 
 #include <crm/stonith-ng.h>
 #include <crm/msg_xml.h>
 #include <crm/common/iso8601.h>
 #include <crm/common/util.h>
 #include <crm/common/xml.h>
 #include <crm/common/output.h>
 #include <crm/common/output_internal.h>
 #include <crm/common/xml_internal.h>
 #include <crm/fencing/internal.h>
 #include <crm/pengine/internal.h>
 
-static inline char *
-time_t_string(time_t when) {
-    return pcmk__epoch2str(&when,
-                           crm_time_log_date
-                           |crm_time_log_timeofday
-                           |crm_time_log_with_timezone);
+/*!
+ * \internal
+ * \brief Convert seconds and nanoseconds to a date/time/time-zone string
+ *
+ * \param[in] sec        Seconds
+ * \param[in] nsec       Nanoseconds
+ * \param[in] show_usec  Whether to show time in microseconds resolution (if
+ *                       false, use seconds resolution)
+ *
+ * \return A string representation of \p sec and \nsec
+ *
+ * \note The caller is responsible for freeing the return value using \p free().
+ */
+static char *
+timespec_string(time_t sec, long nsec, bool show_usec) {
+    const struct timespec ts = {
+        .tv_sec = sec,
+        .tv_nsec = nsec,
+    };
+
+    return pcmk__timespec2str(&ts,
+                              crm_time_log_date
+                              |crm_time_log_timeofday
+                              |crm_time_log_with_timezone
+                              |(show_usec? crm_time_usecs : 0));
 }
 
 /*!
  * \internal
  * \brief Return a status-friendly description of fence history entry state
  *
  * \param[in] history  Fence history entry to describe
  *
  * \return One-word description of history entry state
  * \note This is similar to stonith_op_state_str() except user-oriented (i.e.
  *       for cluster status) instead of developer-oriented (for debug logs).
  */
 static const char *
 state_str(stonith_history_t *history)
 {
     switch (history->state) {
         case st_failed: return "failed";
         case st_done:   return "successful";
         default:        return "pending";
     }
 }
 
 /*!
  * \internal
  * \brief Create a description of a fencing history entry for status displays
  *
  * \param[in] history          Fencing history entry to describe
  * \param[in] full_history     Whether this is for full or condensed history
  * \param[in] later_succeeded  Node that a later equivalent attempt succeeded
  *                             from, or NULL if none
  * \param[in] show_opts        Flag group of pcmk_show_opt_e
  *
  * \return Newly created string with fencing history entry description
  *
  * \note The caller is responsible for freeing the return value with g_free().
  * \note This is similar to stonith__event_description(), except this is used
  *       for history entries (stonith_history_t) in status displays rather than
  *       event notifications (stonith_event_t) in log messages.
  */
 gchar *
 stonith__history_description(stonith_history_t *history, bool full_history,
                              const char *later_succeeded, uint32_t show_opts)
 {
     GString *str = g_string_sized_new(256); // Generous starting size
-    char *completed_time = NULL;
+    char *completed_time_s = NULL;
 
     if ((history->state == st_failed) || (history->state == st_done)) {
-        completed_time = time_t_string(history->completed);
+        completed_time_s = timespec_string(history->completed,
+                                           history->completed_nsec, true);
     }
 
     pcmk__g_strcat(str,
                    stonith_action_str(history->action), " of ", history->target,
                    NULL);
 
     if (!pcmk_is_set(show_opts, pcmk_show_failed_detail)) {
         // More human-friendly
         if (((history->state == st_failed) || (history->state == st_done))
             && (history->delegate != NULL)) {
 
             pcmk__g_strcat(str, " by ", history->delegate, NULL);
         }
         pcmk__g_strcat(str, " for ", history->client, "@", history->origin,
                        NULL);
         if (!full_history) {
             g_string_append(str, " last"); // For example, "last failed at ..."
         }
     }
 
     pcmk__add_word(&str, 0, state_str(history));
 
     // For failed actions, add exit reason if available
     if ((history->state == st_failed) && (history->exit_reason != NULL)) {
         pcmk__g_strcat(str, " (", history->exit_reason, ")", NULL);
     }
 
     if (pcmk_is_set(show_opts, pcmk_show_failed_detail)) {
         // More technical
         g_string_append(str, ": ");
 
         // For completed actions, add delegate if available
         if (((history->state == st_failed) || (history->state == st_done))
             && (history->delegate != NULL)) {
 
             pcmk__g_strcat(str, "delegate=", history->delegate, ", ", NULL);
         }
 
         // Add information about originator
         pcmk__g_strcat(str,
                        "client=", history->client, ", origin=", history->origin,
                        NULL);
 
         // For completed actions, add completion time
-        if (completed_time != NULL) {
+        if (completed_time_s != NULL) {
             if (full_history) {
                 g_string_append(str, ", completed");
             } else if (history->state == st_failed) {
                 g_string_append(str, ", last-failed");
             } else {
                 g_string_append(str, ", last-successful");
             }
-            pcmk__g_strcat(str, "='", completed_time, "'", NULL);
-        }
-    } else { // More human-friendly
-        if (completed_time != NULL) {
-            pcmk__g_strcat(str, " at ", completed_time, NULL);
+            pcmk__g_strcat(str, "='", completed_time_s, "'", NULL);
         }
+    } else if (completed_time_s != NULL) {
+        // More human-friendly
+        pcmk__g_strcat(str, " at ", completed_time_s, NULL);
     }
 
     if ((history->state == st_failed) && (later_succeeded != NULL)) {
         pcmk__g_strcat(str,
                        " (a later attempt from ", later_succeeded,
                        " succeeded)", NULL);
     }
 
-    free(completed_time);
+    free(completed_time_s);
     return g_string_free(str, FALSE);
 }
 
 PCMK__OUTPUT_ARGS("failed-fencing-list", "stonith_history_t *", "GList *",
                   "uint32_t", "uint32_t", "bool")
 static int
 failed_history(pcmk__output_t *out, va_list args)
 {
     stonith_history_t *history = va_arg(args, stonith_history_t *);
     GList *only_node = va_arg(args, GList *);
     uint32_t section_opts = va_arg(args, uint32_t);
     uint32_t show_opts = va_arg(args, uint32_t);
     bool print_spacer = va_arg(args, int);
 
     int rc = pcmk_rc_no_output;
 
     for (stonith_history_t *hp = history; hp; hp = hp->next) {
         if (hp->state != st_failed) {
             continue;
         }
 
         if (!pcmk__str_in_list(hp->target, only_node, pcmk__str_star_matches|pcmk__str_casei)) {
             continue;
         }
 
         PCMK__OUTPUT_LIST_HEADER(out, print_spacer, rc, "Failed Fencing Actions");
         out->message(out, "stonith-event", hp,
                      pcmk_all_flags_set(section_opts, pcmk_section_fencing_all),
                      false, stonith__later_succeeded(hp, history), show_opts);
         out->increment_list(out);
     }
 
     PCMK__OUTPUT_LIST_FOOTER(out, rc);
     return rc;
 }
 
 PCMK__OUTPUT_ARGS("fencing-list", "stonith_history_t *", "GList *", "uint32_t",
                   "uint32_t", "bool")
 static int
 stonith_history(pcmk__output_t *out, va_list args)
 {
     stonith_history_t *history = va_arg(args, stonith_history_t *);
     GList *only_node = va_arg(args, GList *);
     uint32_t section_opts = va_arg(args, uint32_t);
     uint32_t show_opts = va_arg(args, uint32_t);
     bool print_spacer = va_arg(args, int);
 
     int rc = pcmk_rc_no_output;
 
     for (stonith_history_t *hp = history; hp; hp = hp->next) {
         if (!pcmk__str_in_list(hp->target, only_node, pcmk__str_star_matches|pcmk__str_casei)) {
             continue;
         }
 
         if (hp->state != st_failed) {
             PCMK__OUTPUT_LIST_HEADER(out, print_spacer, rc, "Fencing History");
             out->message(out, "stonith-event", hp,
                          pcmk_all_flags_set(section_opts,
                                             pcmk_section_fencing_all),
                          false, stonith__later_succeeded(hp, history), show_opts);
             out->increment_list(out);
         }
     }
 
     PCMK__OUTPUT_LIST_FOOTER(out, rc);
     return rc;
 }
 
 PCMK__OUTPUT_ARGS("full-fencing-list", "crm_exit_t", "stonith_history_t *",
                   "GList *", "uint32_t", "uint32_t", "bool")
 static int
 full_history(pcmk__output_t *out, va_list args)
 {
     crm_exit_t history_rc G_GNUC_UNUSED = va_arg(args, crm_exit_t);
     stonith_history_t *history = va_arg(args, stonith_history_t *);
     GList *only_node = va_arg(args, GList *);
     uint32_t section_opts = va_arg(args, uint32_t);
     uint32_t show_opts = va_arg(args, uint32_t);
     bool print_spacer = va_arg(args, int);
 
     int rc = pcmk_rc_no_output;
 
     for (stonith_history_t *hp = history; hp; hp = hp->next) {
         if (!pcmk__str_in_list(hp->target, only_node, pcmk__str_star_matches|pcmk__str_casei)) {
             continue;
         }
 
         PCMK__OUTPUT_LIST_HEADER(out, print_spacer, rc, "Fencing History");
         out->message(out, "stonith-event", hp,
                      pcmk_all_flags_set(section_opts, pcmk_section_fencing_all),
                      false, stonith__later_succeeded(hp, history), show_opts);
         out->increment_list(out);
     }
 
     PCMK__OUTPUT_LIST_FOOTER(out, rc);
     return rc;
 }
 
 PCMK__OUTPUT_ARGS("full-fencing-list", "crm_exit_t", "stonith_history_t *",
                   "GList *", "uint32_t", "uint32_t", "bool")
 static int
 full_history_xml(pcmk__output_t *out, va_list args)
 {
     crm_exit_t history_rc = va_arg(args, crm_exit_t);
     stonith_history_t *history = va_arg(args, stonith_history_t *);
     GList *only_node = va_arg(args, GList *);
     uint32_t section_opts = va_arg(args, uint32_t);
     uint32_t show_opts = va_arg(args, uint32_t);
     bool print_spacer G_GNUC_UNUSED = va_arg(args, int);
 
     int rc = pcmk_rc_no_output;
 
     if (history_rc == 0) {
         for (stonith_history_t *hp = history; hp; hp = hp->next) {
             if (!pcmk__str_in_list(hp->target, only_node, pcmk__str_star_matches|pcmk__str_casei)) {
                 continue;
             }
 
             PCMK__OUTPUT_LIST_HEADER(out, false, rc, "Fencing History");
             out->message(out, "stonith-event", hp,
                          pcmk_all_flags_set(section_opts,
                                             pcmk_section_fencing_all),
                          false, stonith__later_succeeded(hp, history), show_opts);
             out->increment_list(out);
         }
 
         PCMK__OUTPUT_LIST_FOOTER(out, rc);
     } else {
         char *rc_s = pcmk__itoa(history_rc);
 
         pcmk__output_create_xml_node(out, "fence_history",
                                      "status", rc_s,
                                      NULL);
         free(rc_s);
 
         rc = pcmk_rc_ok;
     }
 
     return rc;
 }
 
 PCMK__OUTPUT_ARGS("last-fenced", "const char *", "time_t")
 static int
 last_fenced_html(pcmk__output_t *out, va_list args) {
     const char *target = va_arg(args, const char *);
     time_t when = va_arg(args, time_t);
 
     if (when) {
         char *buf = crm_strdup_printf("Node %s last fenced at: %s", target, ctime(&when));
         pcmk__output_create_html_node(out, "div", NULL, NULL, buf);
         free(buf);
         return pcmk_rc_ok;
     } else {
         return pcmk_rc_no_output;
     }
 }
 
 PCMK__OUTPUT_ARGS("last-fenced", "const char *", "time_t")
 static int
 last_fenced_text(pcmk__output_t *out, va_list args) {
     const char *target = va_arg(args, const char *);
     time_t when = va_arg(args, time_t);
 
     if (when) {
         pcmk__indented_printf(out, "Node %s last fenced at: %s", target, ctime(&when));
     } else {
         pcmk__indented_printf(out, "Node %s has never been fenced\n", target);
     }
 
     return pcmk_rc_ok;
 }
 
 PCMK__OUTPUT_ARGS("last-fenced", "const char *", "time_t")
 static int
 last_fenced_xml(pcmk__output_t *out, va_list args) {
     const char *target = va_arg(args, const char *);
     time_t when = va_arg(args, time_t);
 
     if (when) {
-        char *buf = time_t_string(when);
+        char *buf = timespec_string(when, 0, false);
 
         pcmk__output_create_xml_node(out, "last-fenced",
                                      "target", target,
                                      "when", buf,
                                      NULL);
 
         free(buf);
         return pcmk_rc_ok;
     } else {
         return pcmk_rc_no_output;
     }
 }
 
 PCMK__OUTPUT_ARGS("pending-fencing-list", "stonith_history_t *", "GList *",
                   "uint32_t", "uint32_t", "bool")
 static int
 pending_actions(pcmk__output_t *out, va_list args)
 {
     stonith_history_t *history = va_arg(args, stonith_history_t *);
     GList *only_node = va_arg(args, GList *);
     uint32_t section_opts = va_arg(args, uint32_t);
     uint32_t show_opts = va_arg(args, uint32_t);
     bool print_spacer = va_arg(args, int);
 
     int rc = pcmk_rc_no_output;
 
     for (stonith_history_t *hp = history; hp; hp = hp->next) {
         if (!pcmk__str_in_list(hp->target, only_node, pcmk__str_star_matches|pcmk__str_casei)) {
             continue;
         }
 
         /* Skip the rest of the history after we see a failed/done action */
         if ((hp->state == st_failed) || (hp->state == st_done)) {
             break;
         }
 
         PCMK__OUTPUT_LIST_HEADER(out, print_spacer, rc, "Pending Fencing Actions");
         out->message(out, "stonith-event", hp,
                      pcmk_all_flags_set(section_opts, pcmk_section_fencing_all),
                      false, stonith__later_succeeded(hp, history), show_opts);
         out->increment_list(out);
     }
 
     PCMK__OUTPUT_LIST_FOOTER(out, rc);
     return rc;
 }
 
 PCMK__OUTPUT_ARGS("stonith-event", "stonith_history_t *", "bool", "bool",
                   "const char *", "uint32_t")
 static int
 stonith_event_html(pcmk__output_t *out, va_list args)
 {
     stonith_history_t *event = va_arg(args, stonith_history_t *);
     bool full_history = va_arg(args, int);
     bool completed_only G_GNUC_UNUSED = va_arg(args, int);
     const char *succeeded = va_arg(args, const char *);
     uint32_t show_opts = va_arg(args, uint32_t);
 
     gchar *desc = stonith__history_description(event, full_history, succeeded,
                                                show_opts);
 
     switch(event->state) {
         case st_done:
             out->list_item(out, "successful-stonith-event", "%s", desc);
             break;
 
         case st_failed:
             out->list_item(out, "failed-stonith-event", "%s", desc);
             break;
 
         default:
             out->list_item(out, "pending-stonith-event", "%s", desc);
             break;
     }
     g_free(desc);
     return pcmk_rc_ok;
 }
 
 PCMK__OUTPUT_ARGS("stonith-event", "stonith_history_t *", "bool", "bool",
                   "const char *", "uint32_t")
 static int
 stonith_event_text(pcmk__output_t *out, va_list args)
 {
     stonith_history_t *event = va_arg(args, stonith_history_t *);
     bool full_history = va_arg(args, int);
     bool completed_only = va_arg(args, int);
     const char *succeeded = va_arg(args, const char *);
     uint32_t show_opts = va_arg(args, uint32_t);
 
     if (completed_only) {
         pcmk__formatted_printf(out, "%lld\n", (long long) event->completed);
     } else {
         gchar *desc = stonith__history_description(event, full_history, succeeded,
                                                    show_opts);
 
         pcmk__indented_printf(out, "%s\n", desc);
         g_free(desc);
     }
 
     return pcmk_rc_ok;
 }
 
 PCMK__OUTPUT_ARGS("stonith-event", "stonith_history_t *", "bool", "bool",
                   "const char *", "uint32_t")
 static int
 stonith_event_xml(pcmk__output_t *out, va_list args)
 {
     stonith_history_t *event = va_arg(args, stonith_history_t *);
     bool full_history G_GNUC_UNUSED = va_arg(args, int);
     bool completed_only G_GNUC_UNUSED = va_arg(args, int);
     const char *succeeded G_GNUC_UNUSED = va_arg(args, const char *);
     uint32_t show_opts G_GNUC_UNUSED = va_arg(args, uint32_t);
 
-    char *buf = NULL;
-
     xmlNodePtr node = pcmk__output_create_xml_node(out, "fence_event",
                                                    "action", event->action,
                                                    "target", event->target,
                                                    "client", event->client,
                                                    "origin", event->origin,
                                                    NULL);
 
     switch (event->state) {
         case st_failed:
             pcmk__xe_set_props(node, "status", "failed",
                                XML_LRM_ATTR_EXIT_REASON, event->exit_reason,
                                NULL);
             break;
 
         case st_done:
             crm_xml_add(node, "status", "success");
             break;
 
         default: {
             char *state = pcmk__itoa(event->state);
             pcmk__xe_set_props(node, "status", "pending",
                                "extended-status", state,
                                NULL);
             free(state);
             break;
         }
     }
 
     if (event->delegate != NULL) {
         crm_xml_add(node, "delegate", event->delegate);
     }
 
-    if (event->state == st_failed || event->state == st_done) {
-        buf = time_t_string(event->completed);
-        crm_xml_add(node, "completed", buf);
-        free(buf);
+    if ((event->state == st_failed) || (event->state == st_done)) {
+        char *time_s = timespec_string(event->completed, event->completed_nsec,
+                                       true);
+
+        crm_xml_add(node, "completed", time_s);
+        free(time_s);
     }
 
     return pcmk_rc_ok;
 }
 
 PCMK__OUTPUT_ARGS("validate", "const char *", "const char *", "char *", "char *", "int")
 static int
 validate_agent_html(pcmk__output_t *out, va_list args) {
     const char *agent = va_arg(args, const char *);
     const char *device = va_arg(args, const char *);
     char *output = va_arg(args, char *);
     char *error_output = va_arg(args, char *);
     int rc = va_arg(args, int);
 
     if (device) {
         char *buf = crm_strdup_printf("Validation of %s on %s %s", agent, device,
                                       rc ? "failed" : "succeeded");
         pcmk__output_create_html_node(out, "div", NULL, NULL, buf);
         free(buf);
     } else {
         char *buf = crm_strdup_printf("Validation of %s %s", agent,
                                       rc ? "failed" : "succeeded");
         pcmk__output_create_html_node(out, "div", NULL, NULL, buf);
         free(buf);
     }
 
     out->subprocess_output(out, rc, output, error_output);
     return rc;
 }
 
 PCMK__OUTPUT_ARGS("validate", "const char *", "const char *", "char *", "char *", "int")
 static int
 validate_agent_text(pcmk__output_t *out, va_list args) {
     const char *agent = va_arg(args, const char *);
     const char *device = va_arg(args, const char *);
     char *output = va_arg(args, char *);
     char *error_output = va_arg(args, char *);
     int rc = va_arg(args, int);
 
     if (device) {
         pcmk__indented_printf(out, "Validation of %s on %s %s\n", agent, device,
                               rc ? "failed" : "succeeded");
     } else {
         pcmk__indented_printf(out, "Validation of %s %s\n", agent,
                               rc ? "failed" : "succeeded");
     }
 
     out->subprocess_output(out, rc, output, error_output);
     return rc;
 }
 
 PCMK__OUTPUT_ARGS("validate", "const char *", "const char *", "char *", "char *", "int")
 static int
 validate_agent_xml(pcmk__output_t *out, va_list args) {
     const char *agent = va_arg(args, const char *);
     const char *device = va_arg(args, const char *);
     char *output = va_arg(args, char *);
     char *error_output = va_arg(args, char *);
     int rc = va_arg(args, int);
 
     xmlNodePtr node = pcmk__output_create_xml_node(
         out, "validate", "agent", agent, "valid", pcmk__btoa(rc == pcmk_ok),
         NULL);
 
     if (device != NULL) {
         crm_xml_add(node, "device", device);
     }
 
     pcmk__output_xml_push_parent(out, node);
     out->subprocess_output(out, rc, output, error_output);
     pcmk__output_xml_pop_parent(out);
 
     return rc;
 }
 
 static pcmk__message_entry_t fmt_functions[] = {
     { "failed-fencing-list", "default", failed_history },
     { "fencing-list", "default", stonith_history },
     { "full-fencing-list", "default", full_history },
     { "full-fencing-list", "xml", full_history_xml },
     { "last-fenced", "html", last_fenced_html },
     { "last-fenced", "log", last_fenced_text },
     { "last-fenced", "text", last_fenced_text },
     { "last-fenced", "xml", last_fenced_xml },
     { "pending-fencing-list", "default", pending_actions },
     { "stonith-event", "html", stonith_event_html },
     { "stonith-event", "log", stonith_event_text },
     { "stonith-event", "text", stonith_event_text },
     { "stonith-event", "xml", stonith_event_xml },
     { "validate", "html", validate_agent_html },
     { "validate", "log", validate_agent_text },
     { "validate", "text", validate_agent_text },
     { "validate", "xml", validate_agent_xml },
 
     { NULL, NULL, NULL }
 };
 
 void
 stonith__register_messages(pcmk__output_t *out) {
     pcmk__register_messages(out, fmt_functions);
 }