time: time.ParseInLocation can get the seconds wrong

[bbp-brieuc]

Go version

go version go1.23.4 darwin/arm64

Output of go env in your module/workspace:

GO111MODULE=''
GOARCH='arm64'
GOBIN=''
GOCACHE='/Users/brieucjeunhomme/Library/Caches/go-build'
GOENV='/Users/brieucjeunhomme/Library/Application Support/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='arm64'
GOHOSTOS='darwin'
GOINSECURE=''
GOMODCACHE='/Users/brieucjeunhomme/go/pkg/mod'
GONOPROXY='github.com/bbp-brieuc'
GONOSUMDB='github.com/bbp-brieuc'
GOOS='darwin'
GOPATH='/Users/brieucjeunhomme/go'
GOPRIVATE='github.com/bbp-brieuc'
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/darwin_arm64'
GOVCS=''
GOVERSION='go1.23.4'
GODEBUG=''
GOTELEMETRY='local'
GOTELEMETRYDIR='/Users/brieucjeunhomme/Library/Application Support/go/telemetry'
GCCGO='gccgo'
GOARM64='v8.0'
AR='ar'
CC='clang'
CXX='clang++'
CGO_ENABLED='1'
GOMOD='/Users/brieucjeunhomme/eodhd/go.mod'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -ffile-prefix-map=/var/folders/3t/k4p_jwdd147888b91dvqm6s80000gn/T/go-build325982754=/tmp/go-build -gno-record-gcc-switches -fno-common'

What did you do?

I parsed a date with only a year and month:
fmt.Println(time.ParseInLocation("2006-05", "2025-01", time.UTC))

What did you see happen?

The resulting time had a non-0 second, the output was:
2025-01-01 00:00:01 +0000 UTC

What did you expect to see?

A result with a 0 second:
2025-01-01 00:00:00 +0000 UTC

[gabyhelp]

Related Issues

• time: time ParseInLocation error #66987 (closed)
• time: ParseInLocation error #49284 (closed)
• time: time zone parsing when format includes time zone seconds fails #68263 (closed)
• time: ParseInLocation does not adjust timezone offset when seconds are not explicitly set #53919 (closed)
• time: Parse inappropriately sets Location() to Local in some circumstances #19750 (closed)
• time.Parse doesn't seem to parse the abbreviated timezone as expected #56528 (closed)
• time: Parse defaults year is 0000 while Time{} is 0001 #40925 (closed)
• time: ParseInLocation panics if no Location specified #25646 (closed)
• Strange time.Parse() behavior. #18798 (closed)
• time: Parse not setting Location to Local when TZ=UTC #45960

_{(Emoji vote if this was helpful or unhelpful; more detailed feedback welcome in this discussion.)}

[seankhliao]

05 in the reference time corresponds to seconds.

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