github.com/spf13/cast v1.10.0: ToTime

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify github.com/spf13/cast.ToTime in pkg:golang/github.com/spf13/cast@v1.10.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/spf13/cast@v1.10.0
Demonstrate these symbols/APIs:
  - github.com/spf13/cast.ToTime

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

package sample

import (
	"time"

	"github.com/spf13/cast"
)

// ToTime converts any compatible value to time.Time using cast.ToTime.
func ToTime(v any) time.Time {
	return cast.ToTime(v)
}

// ToTimeE converts any compatible value to time.Time using cast.ToTimeE, returning an error on failure.
func ToTimeE(v any) (time.Time, error) {
	return cast.ToTimeE(v)
}

package sample

import (
	"encoding/json"
	"testing"
	"time"

	"github.com/spf13/cast"
)

func TestToTime_Time(t *testing.T) {
	expected := time.Date(2025, 1, 1, 10, 0, 0, 0, time.UTC)
	if got := cast.ToTime(expected); !got.Equal(expected) {
		t.Fatalf("cast.ToTime(%v) = %v; want %v", expected, got, expected)
	}
	val, err := cast.ToTimeE(expected)
	if err != nil || !val.Equal(expected) {
		t.Fatalf("cast.ToTimeE(%v) = (%v, %v); want (%v, nil)", expected, val, err, expected)
	}
}

func TestToTime_Strings(t *testing.T) {
	expected := time.Date(2025, 1, 1, 10, 0, 0, 0, time.UTC)
	cases := []string{
		"2025-01-01T10:00:00Z",
		"2025-01-01T10:00:00+00:00",
		"2025-01-01 10:00:00",
		"Wed, 01 Jan 2025 10:00:00 UTC",
	}
	for _, in := range cases {
		if got := cast.ToTime(in); !got.Equal(expected) {
			t.Fatalf("cast.ToTime(%q) = %v; want %v", in, got, expected)
		}
		val, err := cast.ToTimeE(in)
		if err != nil || !val.Equal(expected) {
			t.Fatalf("cast.ToTimeE(%q) = (%v, %v); want (%v, nil)", in, val, err, expected)
		}
	}
}

func TestToTime_UnixTimestamps(t *testing.T) {
	sec := int64(1735725600) // 2025-01-01 10:00:00 UTC
	expected := time.Unix(sec, 0)

	cases := []any{
		sec,
		int(sec),
		int32(sec),
		uint(sec),
		uint64(sec),
		json.Number("1735725600"),
	}
	for _, v := range cases {
		if got := cast.ToTime(v); !got.Equal(expected) {
			t.Fatalf("cast.ToTime(%T(%v)) = %v; want %v", v, v, got, expected)
		}
		val, err := cast.ToTimeE(v)
		if err != nil || !val.Equal(expected) {
			t.Fatalf("cast.ToTimeE(%T(%v)) = (%v, %v); want (%v, nil)", v, v, val, err, expected)
		}
	}
}

func TestToTime_Nil(t *testing.T) {
	if got := cast.ToTime(nil); !got.IsZero() {
		t.Fatalf("cast.ToTime(nil) = %v; want zero time", got)
	}
	val, err := cast.ToTimeE(nil)
	if err != nil || !val.IsZero() {
		t.Fatalf("cast.ToTimeE(nil) = (%v, %v); want (zero time, nil)", val, err)
	}
}

func TestToTime_Pointers(t *testing.T) {
	expected := time.Date(2025, 1, 1, 10, 0, 0, 0, time.UTC)
	s := "2025-01-01T10:00:00Z"
	sec := int64(1735725600)

	if got := cast.ToTime(&expected); !got.Equal(expected) {
		t.Fatalf("cast.ToTime(&time.Time) = %v; want %v", got, expected)
	}
	if got := cast.ToTime(&s); !got.Equal(expected) {
		t.Fatalf("cast.ToTime(&string) = %v; want %v", got, expected)
	}
	if got := cast.ToTime(&sec); !got.Equal(expected) {
		t.Fatalf("cast.ToTime(&int64) = %v; want %v", got, expected)
	}
}

func TestToTime_Invalid(t *testing.T) {
	invalidCases := []any{
		"invalid-date-string",
		true,
		12.34,
		[]int{1, 2},
		map[string]int{"a": 1},
	}
	for _, c := range invalidCases {
		if got := cast.ToTime(c); !got.IsZero() {
			t.Fatalf("cast.ToTime(%v) = %v; want zero time", c, got)
		}
		if _, err := cast.ToTimeE(c); err == nil {
			t.Fatalf("cast.ToTimeE(%v) expected error, got nil", c)
		}
	}
}

{"case":{"caseId":"case:sha256:5612bcae7f39ad6b5107966f6c8db0aa3fe422ec139c034016bbb21d0228b656","contract":["cast.ToTime returns the unchanged time when passed a time.Time value","cast.ToTime and cast.ToTimeE parse date and datetime strings in RFC3339 and common formats into time.Time","cast.ToTime and cast.ToTimeE convert signed and unsigned integer unix timestamps in seconds into time.Time","cast.ToTime and cast.ToTimeE convert json.Number unix timestamps in seconds into time.Time","cast.ToTime returns a zero time and cast.ToTimeE returns nil error for nil values","cast.ToTime unwraps pointer values before converting their underlying values to time.Time","cast.ToTime returns a zero time and cast.ToTimeE returns an error for invalid date strings and unsupported types"],"goal":"verify github.com/spf13/cast.ToTime in pkg:golang/github.com/spf13/cast@v1.10.0","kind":"HOW","packages":["pkg:golang/github.com/spf13/cast@v1.10.0"],"schemaVersion":1,"symbols":["github.com/spf13/cast.ToTime"]},"contractCommand":["go","test","./..."],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/github.com/spf13/cast@v1.10.0"],"schemaVersion":1,"subject":"pkg:golang/github.com/spf13/cast@v1.10.0","symbols":["github.com/spf13/cast.ToTime"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.26.6

require github.com/spf13/cast v1.10.0 // indirect

github.com/spf13/cast v1.10.0 h1:h2x0u2shc1QuLHfxi+cTJvs30+ZAHOGRic8uyGTDWxY=
github.com/spf13/cast v1.10.0/go.mod h1:jNfB8QC9IA6ZuY2ZjDp0KtFO2LZZlg4S/7bzP6qqeHo=

{
  "schemaVersion": 1,
  "goal": "verify github.com/spf13/cast.ToTime in pkg:golang/github.com/spf13/cast@v1.10.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/spf13/cast@v1.10.0"
  ],
  "symbols": [
    "github.com/spf13/cast.ToTime"
  ]
}