Diff of the two buildlogs:

--
--- b1/build.log	2023-05-23 03:17:05.588132976 +0000
+++ b2/build.log	2023-05-23 03:18:03.837585915 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Sun Jun 23 21:38:54 -12 2024
-I: pbuilder-time-stamp: 1719221934
+I: Current time: Tue May 23 17:17:08 +14 2023
+I: pbuilder-time-stamp: 1684811828
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/bookworm-reproducible-base.tgz]
 I: copying local configuration
@@ -16,7 +16,7 @@
 I: copying [./libtime-format-perl_1.16.orig.tar.gz]
 I: copying [./libtime-format-perl_1.16-2.debian.tar.xz]
 I: Extracting source
-gpgv: Signature made Thu Oct 13 06:04:45 2022 -12
+gpgv: Signature made Fri Oct 14 08:04:45 2022 +14
 gpgv:                using RSA key B23862C415D6565A4E86CBD7579C160D4C9E23E8
 gpgv: Can't check signature: No public key
 dpkg-source: warning: cannot verify inline signature for ./libtime-format-perl_1.16-2.dsc: no acceptable signature found
@@ -25,52 +25,84 @@
 dpkg-source: info: unpacking libtime-format-perl_1.16-2.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/31384/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/2856/tmp/hooks/D01_modify_environment starting
+debug: Running on codethink10-arm64.
+I: Changing host+domainname to test build reproducibility
+I: Adding a custom variable just for the fun of it...
+I: Changing /bin/sh to bash
+'/bin/sh' -> '/bin/bash'
+lrwxrwxrwx 1 root root 9 May 23 17:17 /bin/sh -> /bin/bash
+I: Setting pbuilder2's login shell to /bin/bash
+I: Setting pbuilder2's GECOS to second user,second room,second work-phone,second home-phone,second other
+I: user script /srv/workspace/pbuilder/2856/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/2856/tmp/hooks/D02_print_environment starting
 I: set
-  BUILDDIR='/build'
-  BUILDUSERGECOS='first user,first room,first work-phone,first home-phone,first other'
-  BUILDUSERNAME='pbuilder1'
-  BUILD_ARCH='arm64'
-  DEBIAN_FRONTEND='noninteractive'
+  BASH=/bin/sh
+  BASHOPTS=checkwinsize:cmdhist:complete_fullquote:extquote:force_fignore:globasciiranges:globskipdots:hostcomplete:interactive_comments:patsub_replacement:progcomp:promptvars:sourcepath
+  BASH_ALIASES=()
+  BASH_ARGC=()
+  BASH_ARGV=()
+  BASH_CMDS=()
+  BASH_LINENO=([0]="12" [1]="0")
+  BASH_LOADABLES_PATH=/usr/local/lib/bash:/usr/lib/bash:/opt/local/lib/bash:/usr/pkg/lib/bash:/opt/pkg/lib/bash:.
+  BASH_SOURCE=([0]="/tmp/hooks/D02_print_environment" [1]="/tmp/hooks/D02_print_environment")
+  BASH_VERSINFO=([0]="5" [1]="2" [2]="15" [3]="1" [4]="release" [5]="aarch64-unknown-linux-gnu")
+  BASH_VERSION='5.2.15(1)-release'
+  BUILDDIR=/build
+  BUILDUSERGECOS='second user,second room,second work-phone,second home-phone,second other'
+  BUILDUSERNAME=pbuilder2
+  BUILD_ARCH=arm64
+  DEBIAN_FRONTEND=noninteractive
   DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=8 '
-  DISTRIBUTION='bookworm'
-  HOME='/var/lib/jenkins'
-  HOST_ARCH='arm64'
+  DIRSTACK=()
+  DISTRIBUTION=bookworm
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/var/lib/jenkins
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=aarch64
+  HOST_ARCH=arm64
   IFS=' 	
   '
-  LANG='C'
-  LANGUAGE='en_US:en'
-  LC_ALL='C'
-  MAIL='/var/mail/root'
-  OPTIND='1'
-  PATH='/usr/sbin:/usr/bin:/sbin:/bin:/usr/games'
-  PBCURRENTCOMMANDLINEOPERATION='build'
-  PBUILDER_OPERATION='build'
-  PBUILDER_PKGDATADIR='/usr/share/pbuilder'
-  PBUILDER_PKGLIBDIR='/usr/lib/pbuilder'
-  PBUILDER_SYSCONFDIR='/etc'
-  PPID='31384'
-  PS1='# '
-  PS2='> '
+  LANG=C
+  LANGUAGE=nl_BE:nl
+  LC_ALL=C
+  MACHTYPE=aarch64-unknown-linux-gnu
+  MAIL=/var/mail/root
+  OPTERR=1
+  OPTIND=1
+  OSTYPE=linux-gnu
+  PATH=/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path
+  PBCURRENTCOMMANDLINEOPERATION=build
+  PBUILDER_OPERATION=build
+  PBUILDER_PKGDATADIR=/usr/share/pbuilder
+  PBUILDER_PKGLIBDIR=/usr/lib/pbuilder
+  PBUILDER_SYSCONFDIR=/etc
+  PIPESTATUS=([0]="0")
+  POSIXLY_CORRECT=y
+  PPID=2856
   PS4='+ '
-  PWD='/'
-  SHELL='/bin/bash'
-  SHLVL='2'
-  SUDO_COMMAND='/usr/bin/timeout -k 18.1h 18h /usr/bin/ionice -c 3 /usr/bin/nice /usr/sbin/pbuilder --build --configfile /srv/reproducible-results/rbuild-debian/r-b-build.g4QTdkj0/pbuilderrc_PCCo --distribution bookworm --hookdir /etc/pbuilder/first-build-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/bookworm-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.g4QTdkj0/b1 --logfile b1/build.log libtime-format-perl_1.16-2.dsc'
-  SUDO_GID='117'
-  SUDO_UID='110'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  USERNAME='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://192.168.101.16:3128'
+  PWD=/
+  SHELL=/bin/bash
+  SHELLOPTS=braceexpand:errexit:hashall:interactive-comments:posix
+  SHLVL=3
+  SUDO_COMMAND='/usr/bin/timeout -k 24.1h 24h /usr/bin/ionice -c 3 /usr/bin/nice -n 11 /usr/bin/unshare --uts -- /usr/sbin/pbuilder --build --configfile /srv/reproducible-results/rbuild-debian/r-b-build.g4QTdkj0/pbuilderrc_D428 --distribution bookworm --hookdir /etc/pbuilder/rebuild-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/bookworm-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.g4QTdkj0/b2 --logfile b2/build.log --extrapackages usrmerge libtime-format-perl_1.16-2.dsc'
+  SUDO_GID=117
+  SUDO_UID=110
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  USERNAME=root
+  _='I: set'
+  http_proxy=http://192.168.101.16:3128
 I: uname -a
-  Linux codethink11-arm64 4.15.0-211-generic #222-Ubuntu SMP Tue Apr 18 18:58:27 UTC 2023 aarch64 GNU/Linux
+  Linux i-capture-the-hostname 4.15.0-211-generic #222-Ubuntu SMP Tue Apr 18 18:58:27 UTC 2023 aarch64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Jun 23 04:48 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/31384/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 May 21 00:24 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/2856/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -188,7 +220,7 @@
 Get: 72 http://deb.debian.org/debian bookworm/main arm64 libdatetime-format-builder-perl all 0.8300-1 [63.8 kB]
 Get: 73 http://deb.debian.org/debian bookworm/main arm64 libdatetime-format-iso8601-perl all 0.16-2 [22.4 kB]
 Get: 74 http://deb.debian.org/debian bookworm/main arm64 libmodule-build-perl all 0.423200-1 [253 kB]
-Fetched 23.6 MB in 3s (7709 kB/s)
+Fetched 23.6 MB in 4s (5666 kB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package sensible-utils.
 (Reading database ... 
(Reading database ... 5%
(Reading database ... 10%
(Reading database ... 15%
(Reading database ... 20%
(Reading database ... 25%
(Reading database ... 30%
(Reading database ... 35%
(Reading database ... 40%
(Reading database ... 45%
(Reading database ... 50%
(Reading database ... 55%
(Reading database ... 60%
(Reading database ... 65%
(Reading database ... 70%
(Reading database ... 75%
(Reading database ... 80%
(Reading database ... 85%
(Reading database ... 90%
(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 19616 files and directories currently installed.)
@@ -500,8 +532,17 @@
 Writing extended state information...
 Building tag database...
  -> Finished parsing the build-deps
+Reading package lists...
+Building dependency tree...
+Reading state information...
+usrmerge is already the newest version (35).
+0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
 I: Building the package
-I: Running cd /build/libtime-format-perl-1.16/ && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" HOME="/nonexistent/first-build" dpkg-buildpackage -us -uc -b && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" HOME="/nonexistent/first-build" dpkg-genchanges -S  > ../libtime-format-perl_1.16-2_source.changes
+I: user script /srv/workspace/pbuilder/2856/tmp/hooks/A99_set_merged_usr starting
+Re-configuring usrmerge...
+I: user script /srv/workspace/pbuilder/2856/tmp/hooks/A99_set_merged_usr finished
+hostname: Temporary failure in name resolution
+I: Running cd /build/libtime-format-perl-1.16/ && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path" HOME="/nonexistent/second-build" dpkg-buildpackage -us -uc -b && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path" HOME="/nonexistent/second-build" dpkg-genchanges -S  > ../libtime-format-perl_1.16-2_source.changes
 dpkg-buildpackage: info: source package libtime-format-perl
 dpkg-buildpackage: info: source version 1.16-2
 dpkg-buildpackage: info: source distribution unstable
@@ -694,46 +735,46 @@
 t/msec.t ......... 
 1..41
 ok 1 - use Time::Format;
-ok 2 - Bug test 1 (1: 2024/06/24 09:39:45.509    -- milli)
-ok 3 - Bug test 2 (1: 2024/06/24 09:39:45.512003 -- micro)
-ok 4 - Bug test 3 (2: 2024/06/24 09:39:45.692    -- milli)
-ok 5 - Bug test 4 (2: 2024/06/24 09:39:45.692753 -- micro)
-ok 6 - Bug test 5 (3: 2024/06/24 09:39:45.873    -- milli)
-ok 7 - Bug test 6 (3: 2024/06/24 09:39:45.873534 -- micro)
-ok 8 - Bug test 7 (4: 2024/06/24 09:39:46.054    -- milli)
-ok 9 - Bug test 8 (4: 2024/06/24 09:39:46.054498 -- micro)
-ok 10 - Bug test 9 (5: 2024/06/24 09:39:46.234    -- milli)
-ok 11 - Bug test 10 (5: 2024/06/24 09:39:46.235280 -- micro)
-ok 12 - Bug test 11 (6: 2024/06/24 09:39:46.415    -- milli)
-ok 13 - Bug test 12 (6: 2024/06/24 09:39:46.416062 -- micro)
-ok 14 - Bug test 13 (7: 2024/06/24 09:39:46.596    -- milli)
-ok 15 - Bug test 14 (7: 2024/06/24 09:39:46.596829 -- micro)
-ok 16 - Bug test 15 (8: 2024/06/24 09:39:46.777    -- milli)
-ok 17 - Bug test 16 (8: 2024/06/24 09:39:46.777566 -- micro)
-ok 18 - Bug test 17 (9: 2024/06/24 09:39:46.958    -- milli)
-ok 19 - Bug test 18 (9: 2024/06/24 09:39:46.958323 -- micro)
-ok 20 - Bug test 19 (10: 2024/06/24 09:39:47.138    -- milli)
-ok 21 - Bug test 20 (10: 2024/06/24 09:39:47.139283 -- micro)
-ok 22 - Bug test 21 (11: 2024/06/24 09:39:47.319    -- milli)
-ok 23 - Bug test 22 (11: 2024/06/24 09:39:47.320046 -- micro)
-ok 24 - Bug test 23 (12: 2024/06/24 09:39:47.500    -- milli)
-ok 25 - Bug test 24 (12: 2024/06/24 09:39:47.500799 -- micro)
-ok 26 - Bug test 25 (13: 2024/06/24 09:39:47.681    -- milli)
-ok 27 - Bug test 26 (13: 2024/06/24 09:39:47.681560 -- micro)
-ok 28 - Bug test 27 (14: 2024/06/24 09:39:47.862    -- milli)
-ok 29 - Bug test 28 (14: 2024/06/24 09:39:47.862335 -- micro)
-ok 30 - Bug test 29 (15: 2024/06/24 09:39:48.042    -- milli)
-ok 31 - Bug test 30 (15: 2024/06/24 09:39:48.043370 -- micro)
-ok 32 - Bug test 31 (16: 2024/06/24 09:39:48.223    -- milli)
-ok 33 - Bug test 32 (16: 2024/06/24 09:39:48.224149 -- micro)
-ok 34 - Bug test 33 (17: 2024/06/24 09:39:48.404    -- milli)
-ok 35 - Bug test 34 (17: 2024/06/24 09:39:48.404890 -- micro)
-ok 36 - Bug test 35 (18: 2024/06/24 09:39:48.585    -- milli)
-ok 37 - Bug test 36 (18: 2024/06/24 09:39:48.585630 -- micro)
-ok 38 - Bug test 37 (19: 2024/06/24 09:39:48.766    -- milli)
-ok 39 - Bug test 38 (19: 2024/06/24 09:39:48.766362 -- micro)
-ok 40 - Bug test 39 (20: 2024/06/24 09:39:48.946    -- milli)
-ok 41 - Bug test 40 (20: 2024/06/24 09:39:48.947124 -- micro)
+ok 2 - Bug test 1 (1: 2023/05/23 03:17:49.749    -- milli)
+ok 3 - Bug test 2 (1: 2023/05/23 03:17:49.751719 -- micro)
+ok 4 - Bug test 3 (2: 2023/05/23 03:17:49.932    -- milli)
+ok 5 - Bug test 4 (2: 2023/05/23 03:17:49.932307 -- micro)
+ok 6 - Bug test 5 (3: 2023/05/23 03:17:50.112    -- milli)
+ok 7 - Bug test 6 (3: 2023/05/23 03:17:50.113007 -- micro)
+ok 8 - Bug test 7 (4: 2023/05/23 03:17:50.293    -- milli)
+ok 9 - Bug test 8 (4: 2023/05/23 03:17:50.293574 -- micro)
+ok 10 - Bug test 9 (5: 2023/05/23 03:17:50.473    -- milli)
+ok 11 - Bug test 10 (5: 2023/05/23 03:17:50.474124 -- micro)
+ok 12 - Bug test 11 (6: 2023/05/23 03:17:50.654    -- milli)
+ok 13 - Bug test 12 (6: 2023/05/23 03:17:50.654700 -- micro)
+ok 14 - Bug test 13 (7: 2023/05/23 03:17:50.835    -- milli)
+ok 15 - Bug test 14 (7: 2023/05/23 03:17:50.835270 -- micro)
+ok 16 - Bug test 15 (8: 2023/05/23 03:17:51.015    -- milli)
+ok 17 - Bug test 16 (8: 2023/05/23 03:17:51.016046 -- micro)
+ok 18 - Bug test 17 (9: 2023/05/23 03:17:51.196    -- milli)
+ok 19 - Bug test 18 (9: 2023/05/23 03:17:51.196662 -- micro)
+ok 20 - Bug test 19 (10: 2023/05/23 03:17:51.376    -- milli)
+ok 21 - Bug test 20 (10: 2023/05/23 03:17:51.377202 -- micro)
+ok 22 - Bug test 21 (11: 2023/05/23 03:17:51.557    -- milli)
+ok 23 - Bug test 22 (11: 2023/05/23 03:17:51.557759 -- micro)
+ok 24 - Bug test 23 (12: 2023/05/23 03:17:51.738    -- milli)
+ok 25 - Bug test 24 (12: 2023/05/23 03:17:51.738318 -- micro)
+ok 26 - Bug test 25 (13: 2023/05/23 03:17:51.918    -- milli)
+ok 27 - Bug test 26 (13: 2023/05/23 03:17:51.918874 -- micro)
+ok 28 - Bug test 27 (14: 2023/05/23 03:17:52.099    -- milli)
+ok 29 - Bug test 28 (14: 2023/05/23 03:17:52.099618 -- micro)
+ok 30 - Bug test 29 (15: 2023/05/23 03:17:52.279    -- milli)
+ok 31 - Bug test 30 (15: 2023/05/23 03:17:52.280205 -- micro)
+ok 32 - Bug test 31 (16: 2023/05/23 03:17:52.460    -- milli)
+ok 33 - Bug test 32 (16: 2023/05/23 03:17:52.460874 -- micro)
+ok 34 - Bug test 33 (17: 2023/05/23 03:17:52.641    -- milli)
+ok 35 - Bug test 34 (17: 2023/05/23 03:17:52.641470 -- micro)
+ok 36 - Bug test 35 (18: 2023/05/23 03:17:52.821    -- milli)
+ok 37 - Bug test 36 (18: 2023/05/23 03:17:52.822117 -- micro)
+ok 38 - Bug test 37 (19: 2023/05/23 03:17:53.002    -- milli)
+ok 39 - Bug test 38 (19: 2023/05/23 03:17:53.002962 -- micro)
+ok 40 - Bug test 39 (20: 2023/05/23 03:17:53.183    -- milli)
+ok 41 - Bug test 40 (20: 2023/05/23 03:17:53.183583 -- micro)
 ok
 t/past.t ......... 
 1..4
@@ -1147,7 +1188,7 @@
 ok 102 - m test: Hour12: (cur)
 ok
 All tests successful.
-Files=26, Tests=533, 17 wallclock secs ( 0.32 usr  0.06 sys + 11.32 cusr  1.11 csys = 12.81 CPU)
+Files=26, Tests=533, 14 wallclock secs ( 0.27 usr  0.05 sys +  8.69 cusr  1.02 csys = 10.03 CPU)
 Result: PASS
 make[1]: Leaving directory '/build/libtime-format-perl-1.16'
    create-stamp debian/debhelper-build-stamp
@@ -1178,12 +1219,14 @@
 dpkg-buildpackage: info: binary-only upload (no source included)
 dpkg-genchanges: info: not including original source code in upload
 I: copying local configuration
+I: user script /srv/workspace/pbuilder/2856/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/2856/tmp/hooks/B01_cleanup finished
 I: unmounting dev/ptmx filesystem
 I: unmounting dev/pts filesystem
 I: unmounting dev/shm filesystem
 I: unmounting proc filesystem
 I: unmounting sys filesystem
 I: cleaning the build env 
-I: removing directory /srv/workspace/pbuilder/31384 and its subdirectories
-I: Current time: Sun Jun 23 21:40:02 -12 2024
-I: pbuilder-time-stamp: 1719222002
+I: removing directory /srv/workspace/pbuilder/2856 and its subdirectories
+I: Current time: Tue May 23 17:18:02 +14 2023
+I: pbuilder-time-stamp: 1684811882