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+<?xml version='1.0'?>
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+  "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
+
+<refentry id="sd_event_now" xmlns:xi="http://www.w3.org/2001/XInclude">
+
+  <refentryinfo>
+    <title>sd_event_now</title>
+    <productname>systemd</productname>
+  </refentryinfo>
+
+  <refmeta>
+    <refentrytitle>sd_event_now</refentrytitle>
+    <manvolnum>3</manvolnum>
+  </refmeta>
+
+  <refnamediv>
+    <refname>sd_event_now</refname>
+
+    <refpurpose>Retrieve current event loop iteration timestamp</refpurpose>
+  </refnamediv>
+
+  <refsynopsisdiv>
+    <funcsynopsis>
+      <funcsynopsisinfo>#include &lt;systemd/sd-event.h&gt;</funcsynopsisinfo>
+
+      <funcprototype>
+        <funcdef>int <function>sd_event_now</function></funcdef>
+        <paramdef>sd_event *<parameter>event</parameter></paramdef>
+        <paramdef>clockid_t <parameter>clock</parameter></paramdef>
+        <paramdef>uint64_t *<parameter>usec</parameter></paramdef>
+      </funcprototype>
+
+    </funcsynopsis>
+  </refsynopsisdiv>
+
+  <refsect1>
+    <title>Description</title>
+
+    <para><function>sd_event_now()</function> returns the time when
+    the most recent event loop iteration began. A timestamp
+    is taken right after returning from the event sleep, and before
+    dispatching any event sources. The <parameter>event</parameter>
+    parameter specifies the event loop object to retrieve the timestamp
+    from. The <parameter>clock</parameter> parameter specifies the clock to
+    retrieve the timestamp for, and is one of
+    <constant>CLOCK_REALTIME</constant> (or equivalently
+    <constant>CLOCK_REALTIME_ALARM</constant>),
+    <constant>CLOCK_MONOTONIC</constant>, or
+    <constant>CLOCK_BOOTTIME</constant> (or equivalently
+    <constant>CLOCK_BOOTTIME_ALARM</constant>), see
+    <citerefentry project='man-pages'><refentrytitle>clock_gettime</refentrytitle><manvolnum>2</manvolnum></citerefentry>
+    for more information on the various clocks. The retrieved
+    timestamp is stored in the <parameter>usec</parameter> parameter,
+    in μs since the clock's epoch. If this function is invoked before
+    the first event loop iteration, the current time is returned, as
+    reported by <function>clock_gettime()</function>. To distinguish
+    this case from a regular invocation the return value will be
+    positive, and zero when the returned timestamp refers to an actual
+    event loop iteration.</para>
+  </refsect1>
+
+  <refsect1>
+    <title>Return Value</title>
+
+    <para>If the first event loop iteration has not run yet <function>sd_event_now()</function> writes
+    current time to <parameter>usec</parameter> and returns a positive return value.  Otherwise, it will
+    write the requested timestamp to <parameter>usec</parameter> and return 0. On failure, the call returns a
+    negative errno-style error code.</para>
+
+    <refsect2>
+      <title>Errors</title>
+
+      <para>Returned values may indicate the following problems:</para>
+
+      <variablelist>
+        <varlistentry>
+          <term><constant>-EINVAL</constant></term>
+
+          <listitem><para>An invalid parameter was passed.</para></listitem>
+
+        </varlistentry>
+
+        <varlistentry>
+          <term><constant>-EOPNOTSUPP</constant></term>
+
+          <listitem><para>Unsupported clock type.</para></listitem>
+        </varlistentry>
+
+        <varlistentry>
+          <term><constant>-ECHILD</constant></term>
+
+          <listitem><para>The event loop object was created in a different process, library or module instance.</para></listitem>
+        </varlistentry>
+      </variablelist>
+    </refsect2>
+  </refsect1>
+
+  <xi:include href="libsystemd-pkgconfig.xml" />
+
+  <refsect1>
+    <title>History</title>
+    <para><function>sd_event_now()</function> was added in version 229.</para>
+  </refsect1>
+
+  <refsect1>
+    <title>See Also</title>
+
+    <para>
+      <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>sd-event</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>sd_event_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>sd_event_add_time</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+      <citerefentry project='man-pages'><refentrytitle>clock_gettime</refentrytitle><manvolnum>2</manvolnum></citerefentry>
+    </para>
+  </refsect1>
+
+</refentry>