diff --git a/pcp.spec b/pcp.spec
index ba9d9b3..1f82fd3 100644
--- a/pcp.spec
+++ b/pcp.spec
@@ -1,6 +1,6 @@
 Name:    pcp
 Version: 5.3.7
-Release: 20%{?dist}
+Release: 21%{?dist}
 Summary: System-level performance monitoring and performance management
 License: GPLv2+ and LGPLv2+ and CC-BY
 URL:     https://pcp.io
@@ -28,6 +28,7 @@ Patch17: redhat-build-jsonsl.patch
 Patch18: redhat-issues-RHEL-7507-pmdaopenmetrics-quoting.patch
 Patch19: redhat-issues-RHEL-7501-pmlogger_farm-selinux-policy.patch
 Patch20: redhat-issues-RHEL-30715-pmproxy-resp-proxy-disabled.patch
+Patch21: redhat-issues-RHEL-29708-python-day-of-year-range.patch
 
 # The additional linker flags break out-of-tree PMDAs.
 # https://bugzilla.redhat.com/show_bug.cgi?id=2043092
@@ -39,11 +40,13 @@ Patch20: redhat-issues-RHEL-30715-pmproxy-resp-proxy-disabled.patch
 %global __python2 python
 %endif
 
-# UsrMerge was completed in EL 7, however the latest 'hostname' package in EL 7 contains "Provides: /bin/hostname"
+# UsrMerge was completed in EL 7, however the latest 'hostname' package in EL 7 contains "Provides: /bin/hostname".  Likewise for /bin/ps from procps[-ng] packages.
 %if 0%{?rhel} >= 8 || 0%{?fedora} >= 17
 %global _hostname_executable /usr/bin/hostname
+%global _ps_executable /usr/bin/ps
 %else
 %global _hostname_executable /bin/hostname
+%global _ps_executable /bin/ps
 %endif
 
 %global disable_perl 0
@@ -294,7 +297,8 @@ BuildRequires: perl-devel perl(strict)
 BuildRequires: perl(ExtUtils::MakeMaker) perl(LWP::UserAgent) perl(JSON)
 BuildRequires: perl(Time::HiRes) perl(Digest::MD5)
 BuildRequires: perl(XML::LibXML) perl(File::Slurp)
-BuildRequires: man %{_hostname_executable}
+BuildRequires: %{_hostname_executable}
+BuildRequires: %{_ps_executable}
 %if !%{disable_systemd}
 BuildRequires: systemd-devel systemd-rpm-macros
 %endif
@@ -308,7 +312,8 @@ BuildRequires: qt5-qtsvg-devel
 %endif
 %endif
 
-Requires: bash xz gawk sed grep findutils which %{_hostname_executable}
+Requires: bash xz gawk sed grep coreutils diffutils findutils
+Requires: which %{_hostname_executable} %{_ps_executable}
 Requires: pcp-libs = %{version}-%{release}
 
 %if !%{disable_selinux}
@@ -3366,6 +3371,10 @@ fi
 %files zeroconf -f pcp-zeroconf-files.rpm
 
 %changelog
+* Thu Aug 08 2024 Nathan Scott <nathans@redhat.com> - 5.3.7-21
+- Fix python API day-of-year out of range bug (RHEL-29708)
+- Added spec deps on ps and diffutils for diff (RHEL-17081)
+
 * Wed Apr 17 2024 Nathan Scott <nathans@redhat.com> - 5.3.7-20
 - Disable RESP proxying by default in pmproxy (RHEL-30715)
 
diff --git a/redhat-issues-RHEL-29708-python-day-of-year-range.patch b/redhat-issues-RHEL-29708-python-day-of-year-range.patch
new file mode 100644
index 0000000..8381d5f
--- /dev/null
+++ b/redhat-issues-RHEL-29708-python-day-of-year-range.patch
@@ -0,0 +1,34 @@
+commit ce6112399ebf0ff39069a34bc9286242c875555e
+Author: adam kaminski <adam@adamkaminski.com>
+Date:   Fri Feb 9 12:49:34 2024 -0500
+
+    pmapi.py : fix for struct_time() and day of year out of range on yyyy-01-01
+    
+    Fix for `day of year out of range` on 2024-01-01, due to self.tm_yday - 1, which returns `[2024, 1, 1, 2, 3, 0, 0, -1, 0]`. The range for tm_yday should be [1, 366].
+    
+    # timedatectl set-ntp false
+    # timedatectl set-time "2024-01-01 00:00:00"
+    # /usr/libexec/pcp/bin/pcp-mpstat -P ALL -t 1 -s 2
+    Traceback (most recent call last):
+      File "/usr/libexec/pcp/bin/pcp-mpstat", line 653, in <module>
+        sts = manager.run()
+      File "/usr/lib64/python3.6/site-packages/pcp/pmcc.py", line 687, in run
+        self._printer.report(self)
+      File "/usr/libexec/pcp/bin/pcp-mpstat", line 606, in report
+        self.print_machine_info(group, manager)
+      File "/usr/libexec/pcp/bin/pcp-mpstat", line 585, in print_machine_info
+        time_string = time.strftime("%x", timestamp.struct_time())
+    ValueError: day of year out of range
+
+diff -Naurp pcp-5.3.7.orig/src/python/pcp/pmapi.py pcp-5.3.7/src/python/pcp/pmapi.py
+--- pcp-5.3.7.orig/src/python/pcp/pmapi.py	2022-04-05 09:05:43.000000000 +1000
++++ pcp-5.3.7/src/python/pcp/pmapi.py	2024-08-08 09:56:16.298625548 +1000
+@@ -299,7 +299,7 @@ class tm(Structure):
+             pywday = 6
+         stlist = [self.tm_year + 1900, self.tm_mon + 1, self.tm_mday,
+                   self.tm_hour, self.tm_min, self.tm_sec,
+-                  pywday, self.tm_yday - 1, self.tm_isdst]
++                  pywday, self.tm_yday + 1, self.tm_isdst]
+         return time.struct_time(stlist)
+ 
+     def __str__(self):