Diff of the two buildlogs:

--
--- b1/build.log	2024-03-25 15:38:48.492586062 +0000
+++ b2/build.log	2024-03-25 15:41:13.486363363 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Mon Mar 25 03:35:24 -12 2024
-I: pbuilder-time-stamp: 1711380924
+I: Current time: Tue Mar 26 05:38:59 +14 2024
+I: pbuilder-time-stamp: 1711381140
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -25,52 +25,84 @@
 dpkg-source: info: unpacking golang-github-rickb777-date_1.20.1-1.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/25747/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/4273/tmp/hooks/D01_modify_environment starting
+debug: Running on virt64c.
+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 Mar 25 15:39 /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/4273/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/4273/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]="21" [3]="1" [4]="release" [5]="arm-unknown-linux-gnueabihf")
+  BASH_VERSION='5.2.21(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='beded1af1cfa4f20897354d7a5c039a9'
-  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='25747'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=875b39afbf4447adbd251ddefad8e5cc
+  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=4273
   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.kYfj6iTY/pbuilderrc_UwM6 --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.kYfj6iTY/b1 --logfile b1/build.log golang-github-rickb777-date_1.20.1-1.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.kYfj6iTY/pbuilderrc_eaVM --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.kYfj6iTY/b2 --logfile b2/build.log golang-github-rickb777-date_1.20.1-1.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 virt32a 6.1.0-18-armmp-lpae #1 SMP Debian 6.1.76-1 (2024-02-01) armv7l GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-18-arm64 #1 SMP Debian 6.1.76-1 (2024-02-01) aarch64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Mar 25 11:27 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/25747/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Mar 25 11:26 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/4273/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -166,7 +198,7 @@
 Get: 46 http://deb.debian.org/debian trixie/main armhf golang-golang-x-net-dev all 1:0.21.0+dfsg-1 [882 kB]
 Get: 47 http://deb.debian.org/debian trixie/main armhf golang-gopkg-yaml.v3-dev all 3.0.1-3 [74.3 kB]
 Get: 48 http://deb.debian.org/debian trixie/main armhf golang-gomega-dev all 1.27.10-1 [156 kB]
-Fetched 67.0 MB in 1s (47.0 MB/s)
+Fetched 67.0 MB in 2s (37.5 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 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 ... 19577 files and directories currently installed.)
@@ -331,8 +363,8 @@
 Setting up tzdata (2024a-1) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Mon Mar 25 15:37:14 UTC 2024.
-Universal Time is now:  Mon Mar 25 15:37:14 UTC 2024.
+Local time is now:      Mon Mar 25 15:39:44 UTC 2024.
+Universal Time is now:  Mon Mar 25 15:39:44 UTC 2024.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up autotools-dev (20220109.1) ...
@@ -379,7 +411,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/golang-github-rickb777-date-1.20.1/ && 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  > ../golang-github-rickb777-date_1.20.1-1_source.changes
+I: user script /srv/workspace/pbuilder/4273/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/4273/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/golang-github-rickb777-date-1.20.1/ && 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  > ../golang-github-rickb777-date_1.20.1-1_source.changes
 dpkg-buildpackage: info: source package golang-github-rickb777-date
 dpkg-buildpackage: info: source version 1.20.1-1
 dpkg-buildpackage: info: source distribution unstable
@@ -397,54 +433,54 @@
    dh_autoreconf -O--builddirectory=_build -O--buildsystem=golang
    dh_auto_configure -O--builddirectory=_build -O--buildsystem=golang
    dh_auto_build -O--builddirectory=_build -O--buildsystem=golang
-	cd _build && go install -trimpath -v -p 3 github.com/rickb777/date github.com/rickb777/date/clock github.com/rickb777/date/gregorian github.com/rickb777/date/period github.com/rickb777/date/timespan github.com/rickb777/date/view
-internal/goarch
+	cd _build && go install -trimpath -v -p 4 github.com/rickb777/date github.com/rickb777/date/clock github.com/rickb777/date/gregorian github.com/rickb777/date/period github.com/rickb777/date/timespan github.com/rickb777/date/view
 internal/unsafeheader
-internal/cpu
-internal/abi
-internal/chacha8rand
-internal/bytealg
+internal/goarch
 internal/coverage/rtcov
+internal/cpu
 internal/godebugs
 internal/goexperiment
+internal/abi
+internal/chacha8rand
 internal/goos
-runtime/internal/atomic
 runtime/internal/math
+internal/bytealg
+runtime/internal/atomic
 runtime/internal/sys
 runtime/internal/syscall
 internal/race
 sync/atomic
 unicode
 unicode/utf8
-runtime
 internal/itoa
 math/bits
-math
 cmp
 slices
+math
+runtime
 internal/reflectlite
 sync
 internal/testlog
 errors
 sort
-io
 internal/oserror
+io
+strconv
 syscall
 bytes
-strconv
 internal/safefilepath
 path
 strings
 reflect
+internal/syscall/execenv
 internal/syscall/unix
 time
-internal/syscall/execenv
 context
-internal/poll
 io/fs
+internal/poll
 github.com/rickb777/date/gregorian
-os
 internal/fmtsort
+os
 fmt
 github.com/rickb777/plural
 database/sql/driver
@@ -454,7 +490,7 @@
 github.com/rickb777/date/view
 github.com/rickb777/date/timespan
    dh_auto_test -O--builddirectory=_build -O--buildsystem=golang
-	cd _build && go test -vet=off -v -p 3 github.com/rickb777/date github.com/rickb777/date/clock github.com/rickb777/date/gregorian github.com/rickb777/date/period github.com/rickb777/date/timespan github.com/rickb777/date/view
+	cd _build && go test -vet=off -v -p 4 github.com/rickb777/date github.com/rickb777/date/clock github.com/rickb777/date/gregorian github.com/rickb777/date/period github.com/rickb777/date/timespan github.com/rickb777/date/view
 === RUN   TestDate_New
 --- PASS: TestDate_New (0.00s)
 === RUN   Test_New_and_Add
@@ -464,7 +500,7 @@
 === RUN   TestDate_Today
 --- PASS: TestDate_Today (0.00s)
 === RUN   TestDate_Time
---- PASS: TestDate_Time (0.00s)
+--- PASS: TestDate_Time (0.01s)
 === RUN   TestPredicates
 --- PASS: TestPredicates (0.00s)
 === RUN   TestArithmetic
@@ -536,7 +572,7 @@
 === RUN   ExampleDate_FormatISO
 --- PASS: ExampleDate_FormatISO (0.00s)
 PASS
-ok  	github.com/rickb777/date	0.019s
+ok  	github.com/rickb777/date	0.046s
 === RUN   TestClockHoursMinutesSeconds
 --- PASS: TestClockHoursMinutesSeconds (0.00s)
 === RUN   TestClockSinceMidnight
@@ -580,7 +616,7 @@
 === RUN   TestClockScanWithNil
 --- PASS: TestClockScanWithNil (0.00s)
 PASS
-ok  	github.com/rickb777/date/clock	0.012s
+ok  	github.com/rickb777/date/clock	0.009s
 === RUN   TestIsLeap
 --- PASS: TestIsLeap (0.00s)
 === RUN   TestDaysInYear
@@ -588,7 +624,7 @@
 === RUN   TestDaysIn
 --- PASS: TestDaysIn (0.00s)
 PASS
-ok  	github.com/rickb777/date/gregorian	0.021s
+ok  	github.com/rickb777/date/gregorian	0.006s
 === RUN   TestPeriodScale
 --- PASS: TestPeriodScale (0.00s)
 === RUN   TestPeriodAdd
@@ -614,7 +650,7 @@
 === RUN   TestPeriodIntComponents
 --- PASS: TestPeriodIntComponents (0.00s)
 === RUN   TestPeriodFloatComponents
---- PASS: TestPeriodFloatComponents (0.01s)
+--- PASS: TestPeriodFloatComponents (0.00s)
 === RUN   TestPeriodToDuration
 --- PASS: TestPeriodToDuration (0.00s)
 === RUN   TestSignPositiveNegative
@@ -634,7 +670,7 @@
 === RUN   TestBetween
 --- PASS: TestBetween (0.00s)
 === RUN   TestNormaliseUnchanged
---- PASS: TestNormaliseUnchanged (0.01s)
+--- PASS: TestNormaliseUnchanged (0.00s)
 === RUN   TestNormaliseChanged
 --- PASS: TestNormaliseChanged (0.00s)
 === RUN   TestPeriodFormat
@@ -644,7 +680,7 @@
 === RUN   TestPeriodOnlyHMS
 --- PASS: TestPeriodOnlyHMS (0.00s)
 === RUN   TestSimplify
---- PASS: TestSimplify (0.00s)
+--- PASS: TestSimplify (0.01s)
 === RUN   TestPeriodScan
 --- PASS: TestPeriodScan (0.00s)
 === RUN   TestPeriodScan_nil_value
@@ -652,7 +688,7 @@
 === RUN   TestPeriodScan_problem_type
 --- PASS: TestPeriodScan_problem_type (0.00s)
 PASS
-ok  	github.com/rickb777/date/period	0.054s
+ok  	github.com/rickb777/date/period	0.049s
 === RUN   TestNewDateRangeOf
 --- PASS: TestNewDateRangeOf (0.00s)
 === RUN   TestNewDateRangeWithNormalise
@@ -742,7 +778,7 @@
 === RUN   TestConversion3
 --- PASS: TestConversion3 (0.00s)
 PASS
-ok  	github.com/rickb777/date/timespan	0.019s
+ok  	github.com/rickb777/date/timespan	0.010s
 === RUN   TestBasicFormatting
 --- PASS: TestBasicFormatting (0.00s)
 === RUN   TestZeroFormatting
@@ -762,7 +798,7 @@
 === RUN   TestTextMarshalling
 --- PASS: TestTextMarshalling (0.00s)
 PASS
-ok  	github.com/rickb777/date/view	0.008s
+ok  	github.com/rickb777/date/view	0.006s
    create-stamp debian/debhelper-build-stamp
    dh_testroot -O--builddirectory=_build -O--buildsystem=golang
    dh_prep -O--builddirectory=_build -O--buildsystem=golang
@@ -789,12 +825,14 @@
 dpkg-buildpackage: info: binary-only upload (no source included)
 dpkg-genchanges: info: including full source code in upload
 I: copying local configuration
+I: user script /srv/workspace/pbuilder/4273/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/4273/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/25747 and its subdirectories
-I: Current time: Mon Mar 25 03:38:43 -12 2024
-I: pbuilder-time-stamp: 1711381123
+I: removing directory /srv/workspace/pbuilder/4273 and its subdirectories
+I: Current time: Tue Mar 26 05:41:08 +14 2024
+I: pbuilder-time-stamp: 1711381268