Diff of the two buildlogs:

--
--- b1/build.log	2025-02-02 07:21:59.443758098 +0000
+++ b2/build.log	2025-02-02 07:26:46.362747718 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Sat Feb  1 19:19:17 -12 2025
-I: pbuilder-time-stamp: 1738480757
+I: Current time: Sun Feb  2 21:22:08 +14 2025
+I: pbuilder-time-stamp: 1738480928
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -22,52 +22,84 @@
 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/9688/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/18170/tmp/hooks/D01_modify_environment starting
+debug: Running on virt64b.
+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 Feb  2 07:22 /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/18170/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/18170/tmp/hooks/D02_print_environment starting
 I: set
-  BUILDDIR='/build/reproducible-path'
-  BUILDUSERGECOS='first user,first room,first work-phone,first home-phone,first other'
-  BUILDUSERNAME='pbuilder1'
-  BUILD_ARCH='armhf'
-  DEBIAN_FRONTEND='noninteractive'
-  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=3 '
-  DISTRIBUTION='trixie'
-  HOME='/root'
-  HOST_ARCH='armhf'
+  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]="37" [3]="1" [4]="release" [5]="arm-unknown-linux-gnueabihf")
+  BASH_VERSION='5.2.37(1)-release'
+  BUILDDIR=/build/reproducible-path
+  BUILDUSERGECOS='second user,second room,second work-phone,second home-phone,second other'
+  BUILDUSERNAME=pbuilder2
+  BUILD_ARCH=armhf
+  DEBIAN_FRONTEND=noninteractive
+  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=4 '
+  DIRSTACK=()
+  DISTRIBUTION=trixie
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=arm
+  HOST_ARCH=armhf
   IFS=' 	
   '
-  INVOCATION_ID='990409bcc68a4c36a346a76cc782ef01'
-  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='9688'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=a84d738cf6fd4ce0a219d07d4d9d652f
+  LANG=C
+  LANGUAGE=it_CH:it
+  LC_ALL=C
+  MACHTYPE=arm-unknown-linux-gnueabihf
+  MAIL=/var/mail/root
+  OPTERR=1
+  OPTIND=1
+  OSTYPE=linux-gnueabihf
+  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=18170
   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.X4z5J5Mb/pbuilderrc_WLeE --distribution trixie --hookdir /etc/pbuilder/first-build-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/trixie-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.X4z5J5Mb/b1 --logfile b1/build.log libtime-format-perl_1.16-2.dsc'
-  SUDO_GID='113'
-  SUDO_UID='107'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://10.0.0.15:3142/'
+  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.X4z5J5Mb/pbuilderrc_U989 --distribution trixie --hookdir /etc/pbuilder/rebuild-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/trixie-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.X4z5J5Mb/b2 --logfile b2/build.log libtime-format-perl_1.16-2.dsc'
+  SUDO_GID=113
+  SUDO_UID=107
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  _='I: set'
+  http_proxy=http://10.0.0.15:3142/
 I: uname -a
-  Linux ff4a 6.1.0-30-armmp-lpae #1 SMP Debian 6.1.124-1 (2025-01-12) armv7l GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-30-arm64 #1 SMP Debian 6.1.124-1 (2025-01-12) aarch64 GNU/Linux
 I: ls -l /bin
   lrwxrwxrwx 1 root root 7 Nov 22 14:40 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/9688/tmp/hooks/D02_print_environment finished
+I: user script /srv/workspace/pbuilder/18170/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -187,7 +219,7 @@
 Get: 74 http://deb.debian.org/debian trixie/main armhf libdatetime-format-builder-perl all 0.8300-1 [63.8 kB]
 Get: 75 http://deb.debian.org/debian trixie/main armhf libdatetime-format-iso8601-perl all 0.16-2 [22.4 kB]
 Get: 76 http://deb.debian.org/debian trixie/main armhf libmodule-build-perl all 0.423400-2 [252 kB]
-Fetched 25.6 MB in 3s (10.2 MB/s)
+Fetched 25.6 MB in 1s (19.5 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package tzdata.
 (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 ... 19573 files and directories currently installed.)
@@ -444,8 +476,8 @@
 Setting up tzdata (2024b-6) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Sun Feb  2 07:21:06 UTC 2025.
-Universal Time is now:  Sun Feb  2 07:21:06 UTC 2025.
+Local time is now:      Sun Feb  2 07:24:43 UTC 2025.
+Universal Time is now:  Sun Feb  2 07:24:43 UTC 2025.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up autotools-dev (20220109.1) ...
@@ -514,7 +546,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/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/18170/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/18170/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/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
@@ -707,46 +743,46 @@
 t/msec.t ......... 
 1..41
 ok 1 - use Time::Format;
-ok 2 - Bug test 1 (1: 2025/02/02 07:21:28.622    -- milli)
-ok 3 - Bug test 2 (1: 2025/02/02 07:21:28.624489 -- micro)
-ok 4 - Bug test 3 (2: 2025/02/02 07:21:28.805    -- milli)
-ok 5 - Bug test 4 (2: 2025/02/02 07:21:28.805515 -- micro)
-ok 6 - Bug test 5 (3: 2025/02/02 07:21:28.987    -- milli)
-ok 7 - Bug test 6 (3: 2025/02/02 07:21:28.988095 -- micro)
-ok 8 - Bug test 7 (4: 2025/02/02 07:21:29.171    -- milli)
-ok 9 - Bug test 8 (4: 2025/02/02 07:21:29.172210 -- micro)
-ok 10 - Bug test 9 (5: 2025/02/02 07:21:29.355    -- milli)
-ok 11 - Bug test 10 (5: 2025/02/02 07:21:29.356061 -- micro)
-ok 12 - Bug test 11 (6: 2025/02/02 07:21:29.538    -- milli)
-ok 13 - Bug test 12 (6: 2025/02/02 07:21:29.538985 -- micro)
-ok 14 - Bug test 13 (7: 2025/02/02 07:21:29.719    -- milli)
-ok 15 - Bug test 14 (7: 2025/02/02 07:21:29.720057 -- micro)
-ok 16 - Bug test 15 (8: 2025/02/02 07:21:29.901    -- milli)
-ok 17 - Bug test 16 (8: 2025/02/02 07:21:29.901515 -- micro)
-ok 18 - Bug test 17 (9: 2025/02/02 07:21:30.082    -- milli)
-ok 19 - Bug test 18 (9: 2025/02/02 07:21:30.082604 -- micro)
-ok 20 - Bug test 19 (10: 2025/02/02 07:21:30.263    -- milli)
-ok 21 - Bug test 20 (10: 2025/02/02 07:21:30.264121 -- micro)
-ok 22 - Bug test 21 (11: 2025/02/02 07:21:30.446    -- milli)
-ok 23 - Bug test 22 (11: 2025/02/02 07:21:30.446696 -- micro)
-ok 24 - Bug test 23 (12: 2025/02/02 07:21:30.627    -- milli)
-ok 25 - Bug test 24 (12: 2025/02/02 07:21:30.628046 -- micro)
-ok 26 - Bug test 25 (13: 2025/02/02 07:21:30.811    -- milli)
-ok 27 - Bug test 26 (13: 2025/02/02 07:21:30.812068 -- micro)
-ok 28 - Bug test 27 (14: 2025/02/02 07:21:30.992    -- milli)
-ok 29 - Bug test 28 (14: 2025/02/02 07:21:30.992696 -- micro)
-ok 30 - Bug test 29 (15: 2025/02/02 07:21:31.175    -- milli)
-ok 31 - Bug test 30 (15: 2025/02/02 07:21:31.176280 -- micro)
-ok 32 - Bug test 31 (16: 2025/02/02 07:21:31.359    -- milli)
-ok 33 - Bug test 32 (16: 2025/02/02 07:21:31.360085 -- micro)
-ok 34 - Bug test 33 (17: 2025/02/02 07:21:31.543    -- milli)
-ok 35 - Bug test 34 (17: 2025/02/02 07:21:31.544101 -- micro)
-ok 36 - Bug test 35 (18: 2025/02/02 07:21:31.727    -- milli)
-ok 37 - Bug test 36 (18: 2025/02/02 07:21:31.728112 -- micro)
-ok 38 - Bug test 37 (19: 2025/02/02 07:21:31.911    -- milli)
-ok 39 - Bug test 38 (19: 2025/02/02 07:21:31.912031 -- micro)
-ok 40 - Bug test 39 (20: 2025/02/02 07:21:32.095    -- milli)
-ok 41 - Bug test 40 (20: 2025/02/02 07:21:32.096282 -- micro)
+ok 2 - Bug test 1 (1: 2025/02/02 07:26:26.226    -- milli)
+ok 3 - Bug test 2 (1: 2025/02/02 07:26:26.228507 -- micro)
+ok 4 - Bug test 3 (2: 2025/02/02 07:26:26.408    -- milli)
+ok 5 - Bug test 4 (2: 2025/02/02 07:26:26.409204 -- micro)
+ok 6 - Bug test 5 (3: 2025/02/02 07:26:26.589    -- milli)
+ok 7 - Bug test 6 (3: 2025/02/02 07:26:26.589869 -- micro)
+ok 8 - Bug test 7 (4: 2025/02/02 07:26:26.770    -- milli)
+ok 9 - Bug test 8 (4: 2025/02/02 07:26:26.770586 -- micro)
+ok 10 - Bug test 9 (5: 2025/02/02 07:26:26.951    -- milli)
+ok 11 - Bug test 10 (5: 2025/02/02 07:26:26.951354 -- micro)
+ok 12 - Bug test 11 (6: 2025/02/02 07:26:27.131    -- milli)
+ok 13 - Bug test 12 (6: 2025/02/02 07:26:27.132175 -- micro)
+ok 14 - Bug test 13 (7: 2025/02/02 07:26:27.312    -- milli)
+ok 15 - Bug test 14 (7: 2025/02/02 07:26:27.313110 -- micro)
+ok 16 - Bug test 15 (8: 2025/02/02 07:26:27.493    -- milli)
+ok 17 - Bug test 16 (8: 2025/02/02 07:26:27.493771 -- micro)
+ok 18 - Bug test 17 (9: 2025/02/02 07:26:27.674    -- milli)
+ok 19 - Bug test 18 (9: 2025/02/02 07:26:27.674488 -- micro)
+ok 20 - Bug test 19 (10: 2025/02/02 07:26:27.855    -- milli)
+ok 21 - Bug test 20 (10: 2025/02/02 07:26:27.855268 -- micro)
+ok 22 - Bug test 21 (11: 2025/02/02 07:26:28.035    -- milli)
+ok 23 - Bug test 22 (11: 2025/02/02 07:26:28.036189 -- micro)
+ok 24 - Bug test 23 (12: 2025/02/02 07:26:28.216    -- milli)
+ok 25 - Bug test 24 (12: 2025/02/02 07:26:28.216994 -- micro)
+ok 26 - Bug test 25 (13: 2025/02/02 07:26:28.397    -- milli)
+ok 27 - Bug test 26 (13: 2025/02/02 07:26:28.397659 -- micro)
+ok 28 - Bug test 27 (14: 2025/02/02 07:26:28.578    -- milli)
+ok 29 - Bug test 28 (14: 2025/02/02 07:26:28.578316 -- micro)
+ok 30 - Bug test 29 (15: 2025/02/02 07:26:28.758    -- milli)
+ok 31 - Bug test 30 (15: 2025/02/02 07:26:28.758922 -- micro)
+ok 32 - Bug test 31 (16: 2025/02/02 07:26:28.939    -- milli)
+ok 33 - Bug test 32 (16: 2025/02/02 07:26:28.939582 -- micro)
+ok 34 - Bug test 33 (17: 2025/02/02 07:26:29.120    -- milli)
+ok 35 - Bug test 34 (17: 2025/02/02 07:26:29.120413 -- micro)
+ok 36 - Bug test 35 (18: 2025/02/02 07:26:29.300    -- milli)
+ok 37 - Bug test 36 (18: 2025/02/02 07:26:29.301080 -- micro)
+ok 38 - Bug test 37 (19: 2025/02/02 07:26:29.481    -- milli)
+ok 39 - Bug test 38 (19: 2025/02/02 07:26:29.481688 -- micro)
+ok 40 - Bug test 39 (20: 2025/02/02 07:26:29.662    -- milli)
+ok 41 - Bug test 40 (20: 2025/02/02 07:26:29.662252 -- micro)
 ok
 t/past.t ......... 
 1..4
@@ -1160,7 +1196,7 @@
 ok 102 - m test: Hour12: (cur)
 ok
 All tests successful.
-Files=26, Tests=533, 22 wallclock secs ( 0.28 usr  0.12 sys + 12.67 cusr  1.22 csys = 14.29 CPU)
+Files=26, Tests=533, 15 wallclock secs ( 0.32 usr  0.06 sys +  9.42 cusr  0.94 csys = 10.74 CPU)
 Result: PASS
 make[1]: Leaving directory '/build/reproducible-path/libtime-format-perl-1.16'
    create-stamp debian/debhelper-build-stamp
@@ -1191,12 +1227,14 @@
 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/18170/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/18170/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/9688 and its subdirectories
-I: Current time: Sat Feb  1 19:21:55 -12 2025
-I: pbuilder-time-stamp: 1738480915
+I: removing directory /srv/workspace/pbuilder/18170 and its subdirectories
+I: Current time: Sun Feb  2 21:26:42 +14 2025
+I: pbuilder-time-stamp: 1738481202