From aae6990d3873f4f8b43b4ec7ff4cee0102e82b47 Mon Sep 17 00:00:00 2001
From: Liam Cervante <liam.cervante@hashicorp.com>
Date: Fri, 21 Apr 2023 09:47:28 +0200
Subject: [PATCH] Add native `plantimestamp` function to Terraform (#32980)

* add plantimestamp function

* documentation

* add missing links

* fix typo
---
 internal/command/jsonplan/plan.go             |   3 +
 internal/lang/funcs/datetime.go               |  12 +
 internal/lang/funcs/descriptions.go           |   4 +
 internal/lang/functions.go                    |   6 +
 internal/lang/functions_descriptions_test.go  |   7 +-
 internal/lang/functions_test.go               |  13 +-
 internal/lang/scope.go                        |   5 +
 .../plans/internal/planproto/planfile.pb.go   | 303 +++++++++---------
 .../plans/internal/planproto/planfile.proto   |   3 +
 internal/plans/plan.go                        |   4 +
 internal/plans/planfile/tfplan.go             |   7 +
 internal/terraform/context_apply.go           |   3 +
 internal/terraform/context_apply2_test.go     |  88 +++++
 internal/terraform/context_plan.go            |  13 +-
 internal/terraform/context_walk.go            |   7 +
 internal/terraform/eval_context_builtin.go    |  16 +-
 internal/terraform/evaluate.go                |  14 +-
 internal/terraform/graph_walk_context.go      |   3 +
 website/data/language-nav-data.json           |   5 +
 .../docs/language/functions/plantimestamp.mdx |  54 ++++
 website/docs/language/functions/timestamp.mdx |   2 +
 website/layouts/language.erb                  |   4 +
 22 files changed, 408 insertions(+), 168 deletions(-)
 create mode 100644 website/docs/language/functions/plantimestamp.mdx

diff --git a/internal/command/jsonplan/plan.go b/internal/command/jsonplan/plan.go
index 5e96008334..36c288020f 100644
--- a/internal/command/jsonplan/plan.go
+++ b/internal/command/jsonplan/plan.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"sort"
 	"strings"
+	"time"
 
 	"github.com/zclconf/go-cty/cty"
 	ctyjson "github.com/zclconf/go-cty/cty/json"
@@ -58,6 +59,7 @@ type plan struct {
 	Config             json.RawMessage   `json:"configuration,omitempty"`
 	RelevantAttributes []ResourceAttr    `json:"relevant_attributes,omitempty"`
 	Checks             json.RawMessage   `json:"checks,omitempty"`
+	Timestamp          string            `json:"timestamp,omitempty"`
 }
 
 func newPlan() *plan {
@@ -193,6 +195,7 @@ func Marshal(
 ) ([]byte, error) {
 	output := newPlan()
 	output.TerraformVersion = version.String()
+	output.Timestamp = p.Timestamp.Format(time.RFC3339)
 
 	err := output.marshalPlanVariables(p.VariableValues, config.Module.Variables)
 	if err != nil {
diff --git a/internal/lang/funcs/datetime.go b/internal/lang/funcs/datetime.go
index fbd7c0b27c..1ffe3a634b 100644
--- a/internal/lang/funcs/datetime.go
+++ b/internal/lang/funcs/datetime.go
@@ -17,6 +17,18 @@ var TimestampFunc = function.New(&function.Spec{
 	},
 })
 
+// MakeStaticTimestampFunc constructs a function that returns a string
+// representation of the date and time specified by the provided argument.
+func MakeStaticTimestampFunc(static time.Time) function.Function {
+	return function.New(&function.Spec{
+		Params: []function.Parameter{},
+		Type:   function.StaticReturnType(cty.String),
+		Impl: func(args []cty.Value, retType cty.Type) (cty.Value, error) {
+			return cty.StringVal(static.Format(time.RFC3339)), nil
+		},
+	})
+}
+
 // TimeAddFunc constructs a function that adds a duration to a timestamp, returning a new timestamp.
 var TimeAddFunc = function.New(&function.Spec{
 	Params: []function.Parameter{
diff --git a/internal/lang/funcs/descriptions.go b/internal/lang/funcs/descriptions.go
index 6439114ce8..7d606f2e60 100644
--- a/internal/lang/funcs/descriptions.go
+++ b/internal/lang/funcs/descriptions.go
@@ -427,6 +427,10 @@ var DescriptionList = map[string]descriptionEntry{
 		Description:      "`timestamp` returns a UTC timestamp string in [RFC 3339](https://tools.ietf.org/html/rfc3339) format.",
 		ParamDescription: []string{},
 	},
+	"plantimestamp": {
+		Description:      "`plantimestamp` returns a UTC timestamp string in [RFC 3339](https://tools.ietf.org/html/rfc3339) format, fixed to a constant time representing the time of the plan.",
+		ParamDescription: []string{},
+	},
 	"title": {
 		Description:      "`title` converts the first letter of each word in the given string to uppercase.",
 		ParamDescription: []string{""},
diff --git a/internal/lang/functions.go b/internal/lang/functions.go
index 8b1c9192d1..b024e55164 100644
--- a/internal/lang/functions.go
+++ b/internal/lang/functions.go
@@ -159,6 +159,12 @@ func (s *Scope) Functions() map[string]function.Function {
 			s.funcs["type"] = funcs.TypeFunc
 		}
 
+		if !s.ConsoleMode {
+			// The plantimestamp function doesn't make sense in the terraform
+			// console.
+			s.funcs["plantimestamp"] = funcs.MakeStaticTimestampFunc(s.PlanTimestamp)
+		}
+
 		if s.PureOnly {
 			// Force our few impure functions to return unknown so that we
 			// can defer evaluating them until a later pass.
diff --git a/internal/lang/functions_descriptions_test.go b/internal/lang/functions_descriptions_test.go
index ee456d87ac..a3e68c4c60 100644
--- a/internal/lang/functions_descriptions_test.go
+++ b/internal/lang/functions_descriptions_test.go
@@ -14,8 +14,11 @@ func TestFunctionDescriptions(t *testing.T) {
 	// WithNewDescriptions will panic if the number doesn't match.
 	allFunctions := scope.Functions()
 
-	if len(allFunctions) != len(funcs.DescriptionList) {
-		t.Errorf("DescriptionList length expected: %d, got %d", len(allFunctions), len(funcs.DescriptionList))
+	// plantimestamp isn't available with ConsoleMode: true
+	expectedFunctionCount := len(funcs.DescriptionList) - 1
+
+	if len(allFunctions) != expectedFunctionCount {
+		t.Errorf("DescriptionList length expected: %d, got %d", len(allFunctions), expectedFunctionCount)
 	}
 
 	for name := range allFunctions {
diff --git a/internal/lang/functions_test.go b/internal/lang/functions_test.go
index e6d5e19874..32a9762d39 100644
--- a/internal/lang/functions_test.go
+++ b/internal/lang/functions_test.go
@@ -5,6 +5,7 @@ import (
 	"os"
 	"path/filepath"
 	"testing"
+	"time"
 
 	"github.com/hashicorp/hcl/v2"
 	"github.com/hashicorp/hcl/v2/hclsyntax"
@@ -669,6 +670,13 @@ func TestFunctions(t *testing.T) {
 			},
 		},
 
+		"plantimestamp": {
+			{
+				`plantimestamp()`,
+				cty.StringVal("2004-04-25T15:00:00Z"),
+			},
+		},
+
 		"pow": {
 			{
 				`pow(1,0)`,
@@ -1242,8 +1250,9 @@ func TestFunctions(t *testing.T) {
 				t.Run(test.src, func(t *testing.T) {
 					data := &dataForTests{} // no variables available; we only need literals here
 					scope := &Scope{
-						Data:    data,
-						BaseDir: "./testdata/functions-test", // for the functions that read from the filesystem
+						Data:          data,
+						BaseDir:       "./testdata/functions-test", // for the functions that read from the filesystem
+						PlanTimestamp: time.Date(2004, 04, 25, 15, 00, 00, 000, time.UTC),
 					}
 					prepareScope(t, scope)
 
diff --git a/internal/lang/scope.go b/internal/lang/scope.go
index fea113269b..146d928776 100644
--- a/internal/lang/scope.go
+++ b/internal/lang/scope.go
@@ -2,6 +2,7 @@ package lang
 
 import (
 	"sync"
+	"time"
 
 	"github.com/zclconf/go-cty/cty/function"
 
@@ -49,6 +50,10 @@ type Scope struct {
 	// ConsoleMode can be set to true to request any console-only functions are
 	// included in this scope.
 	ConsoleMode bool
+
+	// PlanTimestamp is a timestamp representing when the plan was made. It will
+	// either have been generated during this operation or read from the plan.
+	PlanTimestamp time.Time
 }
 
 // SetActiveExperiments allows a caller to declare that a set of experiments
diff --git a/internal/plans/internal/planproto/planfile.pb.go b/internal/plans/internal/planproto/planfile.pb.go
index df4ff03b73..5c8fe259af 100644
--- a/internal/plans/internal/planproto/planfile.pb.go
+++ b/internal/plans/internal/planproto/planfile.pb.go
@@ -389,6 +389,8 @@ type Plan struct {
 	// RelevantAttributes lists individual resource attributes from
 	// ResourceDrift which may have contributed to the plan changes.
 	RelevantAttributes []*PlanResourceAttr `protobuf:"bytes,15,rep,name=relevant_attributes,json=relevantAttributes,proto3" json:"relevant_attributes,omitempty"`
+	// timestamp is the record of truth for when the plan happened.
+	Timestamp string `protobuf:"bytes,21,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
 }
 
 func (x *Plan) Reset() {
@@ -514,6 +516,13 @@ func (x *Plan) GetRelevantAttributes() []*PlanResourceAttr {
 	return nil
 }
 
+func (x *Plan) GetTimestamp() string {
+	if x != nil {
+		return x.Timestamp
+	}
+	return ""
+}
+
 // Backend is a description of backend configuration and other related settings.
 type Backend struct {
 	state         protoimpl.MessageState
@@ -1258,7 +1267,7 @@ var File_planfile_proto protoreflect.FileDescriptor
 
 var file_planfile_proto_rawDesc = []byte{
 	0x0a, 0x0e, 0x70, 0x6c, 0x61, 0x6e, 0x66, 0x69, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f,
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+	0x12, 0x06, 0x74, 0x66, 0x70, 0x6c, 0x61, 0x6e, 0x22, 0xdf, 0x06, 0x0a, 0x04, 0x50, 0x6c, 0x61,
 	0x6e, 0x12, 0x18, 0x0a, 0x07, 0x76, 0x65, 0x72, 0x73, 0x69, 0x6f, 0x6e, 0x18, 0x01, 0x20, 0x01,
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@@ -1300,154 +1309,156 @@ var file_planfile_proto_rawDesc = []byte{
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+	0x45, 0x5f, 0x43, 0x4f, 0x4e, 0x46, 0x49, 0x47, 0x5f, 0x55, 0x4e, 0x4b, 0x4e, 0x4f, 0x57, 0x4e,
+	0x10, 0x0a, 0x12, 0x23, 0x0a, 0x1f, 0x52, 0x45, 0x41, 0x44, 0x5f, 0x42, 0x45, 0x43, 0x41, 0x55,
+	0x53, 0x45, 0x5f, 0x44, 0x45, 0x50, 0x45, 0x4e, 0x44, 0x45, 0x4e, 0x43, 0x59, 0x5f, 0x50, 0x45,
+	0x4e, 0x44, 0x49, 0x4e, 0x47, 0x10, 0x0b, 0x12, 0x1d, 0x0a, 0x19, 0x52, 0x45, 0x41, 0x44, 0x5f,
+	0x42, 0x45, 0x43, 0x41, 0x55, 0x53, 0x45, 0x5f, 0x43, 0x48, 0x45, 0x43, 0x4b, 0x5f, 0x4e, 0x45,
+	0x53, 0x54, 0x45, 0x44, 0x10, 0x0d, 0x12, 0x21, 0x0a, 0x1d, 0x44, 0x45, 0x4c, 0x45, 0x54, 0x45,
+	0x5f, 0x42, 0x45, 0x43, 0x41, 0x55, 0x53, 0x45, 0x5f, 0x4e, 0x4f, 0x5f, 0x4d, 0x4f, 0x56, 0x45,
+	0x5f, 0x54, 0x41, 0x52, 0x47, 0x45, 0x54, 0x10, 0x0c, 0x42, 0x42, 0x5a, 0x40, 0x67, 0x69, 0x74,
+	0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x68, 0x61, 0x73, 0x68, 0x69, 0x63, 0x6f, 0x72,
+	0x70, 0x2f, 0x74, 0x65, 0x72, 0x72, 0x61, 0x66, 0x6f, 0x72, 0x6d, 0x2f, 0x69, 0x6e, 0x74, 0x65,
+	0x72, 0x6e, 0x61, 0x6c, 0x2f, 0x70, 0x6c, 0x61, 0x6e, 0x73, 0x2f, 0x69, 0x6e, 0x74, 0x65, 0x72,
+	0x6e, 0x61, 0x6c, 0x2f, 0x70, 0x6c, 0x61, 0x6e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x06, 0x70,
+	0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/internal/plans/internal/planproto/planfile.proto b/internal/plans/internal/planproto/planfile.proto
index f7a10353b0..b97bd36099 100644
--- a/internal/plans/internal/planproto/planfile.proto
+++ b/internal/plans/internal/planproto/planfile.proto
@@ -82,6 +82,9 @@ message Plan {
     // RelevantAttributes lists individual resource attributes from
     // ResourceDrift which may have contributed to the plan changes.
     repeated resource_attr relevant_attributes = 15;
+
+    // timestamp is the record of truth for when the plan happened.
+    string timestamp = 21;
 }
 
 // Mode describes the planning mode that created the plan.
diff --git a/internal/plans/plan.go b/internal/plans/plan.go
index 4ac924d010..3858cf2609 100644
--- a/internal/plans/plan.go
+++ b/internal/plans/plan.go
@@ -2,6 +2,7 @@ package plans
 
 import (
 	"sort"
+	"time"
 
 	"github.com/hashicorp/terraform/internal/addrs"
 	"github.com/hashicorp/terraform/internal/configs/configschema"
@@ -83,6 +84,9 @@ type Plan struct {
 	// order to report to the user any out-of-band changes we've detected.
 	PrevRunState *states.State
 	PriorState   *states.State
+
+	// Timestamp is the record of truth for when the plan happened.
+	Timestamp time.Time
 }
 
 // CanApply returns true if and only if the recieving plan includes content
diff --git a/internal/plans/planfile/tfplan.go b/internal/plans/planfile/tfplan.go
index f8b982497d..ea3f2e73a5 100644
--- a/internal/plans/planfile/tfplan.go
+++ b/internal/plans/planfile/tfplan.go
@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"io"
 	"io/ioutil"
+	"time"
 
 	"github.com/zclconf/go-cty/cty"
 	"google.golang.org/protobuf/proto"
@@ -246,6 +247,10 @@ func readTfplan(r io.Reader) (*plans.Plan, error) {
 		}
 	}
 
+	if plan.Timestamp, err = time.Parse(time.RFC3339, rawPlan.Timestamp); err != nil {
+		return nil, fmt.Errorf("invalid value for timestamp %s: %s", rawPlan.Timestamp, err)
+	}
+
 	return plan, nil
 }
 
@@ -608,6 +613,8 @@ func writeTfplan(plan *plans.Plan, w io.Writer) error {
 		Workspace: plan.Backend.Workspace,
 	}
 
+	rawPlan.Timestamp = plan.Timestamp.Format(time.RFC3339)
+
 	src, err := proto.Marshal(rawPlan)
 	if err != nil {
 		return fmt.Errorf("serialization error: %s", err)
diff --git a/internal/terraform/context_apply.go b/internal/terraform/context_apply.go
index ada934e3f5..da53a91870 100644
--- a/internal/terraform/context_apply.go
+++ b/internal/terraform/context_apply.go
@@ -50,6 +50,9 @@ func (c *Context) Apply(plan *plans.Plan, config *configs.Config) (*states.State
 		// because that will tell us which checkable objects we're expecting
 		// to see updated results from during the apply step.
 		PlanTimeCheckResults: plan.Checks,
+
+		// We also want to propagate the timestamp from the plan file.
+		PlanTimeTimestamp: plan.Timestamp,
 	})
 	diags = diags.Append(walker.NonFatalDiagnostics)
 	diags = diags.Append(walkDiags)
diff --git a/internal/terraform/context_apply2_test.go b/internal/terraform/context_apply2_test.go
index 97769176dd..18f46768b1 100644
--- a/internal/terraform/context_apply2_test.go
+++ b/internal/terraform/context_apply2_test.go
@@ -1954,3 +1954,91 @@ output "resources" {
 	_, diags = ctx.Apply(plan, m)
 	assertNoErrors(t, diags)
 }
+
+func TestContext2Apply_timestamps(t *testing.T) {
+	m := testModuleInline(t, map[string]string{
+		"main.tf": `
+resource "test_resource" "a" {
+  id = "timestamp"
+  value = timestamp()
+}
+
+resource "test_resource" "b" {
+  id = "plantimestamp"
+  value = plantimestamp()
+}
+`,
+	})
+
+	var plantime time.Time
+
+	p := testProvider("test")
+	p.GetProviderSchemaResponse = getProviderSchemaResponseFromProviderSchema(&ProviderSchema{
+		ResourceTypes: map[string]*configschema.Block{
+			"test_resource": {
+				Attributes: map[string]*configschema.Attribute{
+					"id": {
+						Type:     cty.String,
+						Required: true,
+					},
+					"value": {
+						Type:     cty.String,
+						Required: true,
+					},
+				},
+			},
+		},
+	})
+	p.PlanResourceChangeFn = func(request providers.PlanResourceChangeRequest) providers.PlanResourceChangeResponse {
+		values := request.ProposedNewState.AsValueMap()
+		if id := values["id"]; id.AsString() == "plantimestamp" {
+			var err error
+			plantime, err = time.Parse(time.RFC3339, values["value"].AsString())
+			if err != nil {
+				t.Errorf("couldn't parse plan time: %s", err)
+			}
+		}
+
+		return providers.PlanResourceChangeResponse{
+			PlannedState: request.ProposedNewState,
+		}
+	}
+	p.ApplyResourceChangeFn = func(request providers.ApplyResourceChangeRequest) providers.ApplyResourceChangeResponse {
+		values := request.PlannedState.AsValueMap()
+		if id := values["id"]; id.AsString() == "timestamp" {
+			applytime, err := time.Parse(time.RFC3339, values["value"].AsString())
+			if err != nil {
+				t.Errorf("couldn't parse apply time: %s", err)
+			}
+
+			if applytime.Before(plantime) {
+				t.Errorf("applytime (%s) should be after plantime (%s)", applytime.Format(time.RFC3339), plantime.Format(time.RFC3339))
+			}
+		} else if id.AsString() == "plantimestamp" {
+			otherplantime, err := time.Parse(time.RFC3339, values["value"].AsString())
+			if err != nil {
+				t.Errorf("couldn't parse plan time: %s", err)
+			}
+
+			if !plantime.Equal(otherplantime) {
+				t.Errorf("plantime changed from (%s) to (%s) during apply", plantime.Format(time.RFC3339), otherplantime.Format(time.RFC3339))
+			}
+		}
+
+		return providers.ApplyResourceChangeResponse{
+			NewState: request.PlannedState,
+		}
+	}
+	ctx := testContext2(t, &ContextOpts{
+		Providers: map[addrs.Provider]providers.Factory{
+			addrs.NewDefaultProvider("test"): testProviderFuncFixed(p),
+		},
+	})
+	plan, diags := ctx.Plan(m, states.NewState(), &PlanOpts{
+		Mode: plans.NormalMode,
+	})
+	assertNoErrors(t, diags)
+
+	_, diags = ctx.Apply(plan, m)
+	assertNoErrors(t, diags)
+}
diff --git a/internal/terraform/context_plan.go b/internal/terraform/context_plan.go
index 416232a480..92734a05e3 100644
--- a/internal/terraform/context_plan.go
+++ b/internal/terraform/context_plan.go
@@ -6,6 +6,7 @@ import (
 	"log"
 	"sort"
 	"strings"
+	"time"
 
 	"github.com/zclconf/go-cty/cty"
 
@@ -527,14 +528,17 @@ func (c *Context) planWalk(config *configs.Config, prevRunState *states.State, o
 		return nil, diags
 	}
 
+	timestamp := time.Now().UTC()
+
 	// If we get here then we should definitely have a non-nil "graph", which
 	// we can now walk.
 	changes := plans.NewChanges()
 	walker, walkDiags := c.walk(graph, walkOp, &graphWalkOpts{
-		Config:      config,
-		InputState:  prevRunState,
-		Changes:     changes,
-		MoveResults: moveResults,
+		Config:            config,
+		InputState:        prevRunState,
+		Changes:           changes,
+		MoveResults:       moveResults,
+		PlanTimeTimestamp: timestamp,
 	})
 	diags = diags.Append(walker.NonFatalDiagnostics)
 	diags = diags.Append(walkDiags)
@@ -581,6 +585,7 @@ func (c *Context) planWalk(config *configs.Config, prevRunState *states.State, o
 		PrevRunState:     prevRunState,
 		PriorState:       priorState,
 		Checks:           states.NewCheckResults(walker.Checks),
+		Timestamp:        timestamp,
 
 		// Other fields get populated by Context.Plan after we return
 	}
diff --git a/internal/terraform/context_walk.go b/internal/terraform/context_walk.go
index 523fa73854..9b8be4fa5f 100644
--- a/internal/terraform/context_walk.go
+++ b/internal/terraform/context_walk.go
@@ -2,6 +2,7 @@ package terraform
 
 import (
 	"log"
+	"time"
 
 	"github.com/hashicorp/terraform/internal/checks"
 	"github.com/hashicorp/terraform/internal/configs"
@@ -32,6 +33,11 @@ type graphWalkOpts struct {
 	// the module and resource expansion.
 	PlanTimeCheckResults *states.CheckResults
 
+	// PlanTimeTimestamp should be populated during the plan phase by retrieving
+	// the current UTC timestamp, and should be read from the plan file during
+	// the apply phase.
+	PlanTimeTimestamp time.Time
+
 	MoveResults refactoring.MoveResults
 }
 
@@ -140,5 +146,6 @@ func (c *Context) graphWalker(operation walkOperation, opts *graphWalkOpts) *Con
 		MoveResults:      opts.MoveResults,
 		Operation:        operation,
 		StopContext:      c.runContext,
+		PlanTimestamp:    opts.PlanTimeTimestamp,
 	}
 }
diff --git a/internal/terraform/eval_context_builtin.go b/internal/terraform/eval_context_builtin.go
index 2953e008b6..805f0e152b 100644
--- a/internal/terraform/eval_context_builtin.go
+++ b/internal/terraform/eval_context_builtin.go
@@ -6,23 +6,21 @@ import (
 	"log"
 	"sync"
 
+	"github.com/hashicorp/hcl/v2"
+	"github.com/zclconf/go-cty/cty"
+
+	"github.com/hashicorp/terraform/internal/addrs"
 	"github.com/hashicorp/terraform/internal/checks"
+	"github.com/hashicorp/terraform/internal/configs/configschema"
 	"github.com/hashicorp/terraform/internal/instances"
+	"github.com/hashicorp/terraform/internal/lang"
 	"github.com/hashicorp/terraform/internal/plans"
 	"github.com/hashicorp/terraform/internal/providers"
 	"github.com/hashicorp/terraform/internal/provisioners"
 	"github.com/hashicorp/terraform/internal/refactoring"
-	"github.com/hashicorp/terraform/version"
-
 	"github.com/hashicorp/terraform/internal/states"
-
-	"github.com/hashicorp/hcl/v2"
-	"github.com/hashicorp/terraform/internal/configs/configschema"
-	"github.com/hashicorp/terraform/internal/lang"
 	"github.com/hashicorp/terraform/internal/tfdiags"
-
-	"github.com/hashicorp/terraform/internal/addrs"
-	"github.com/zclconf/go-cty/cty"
+	"github.com/hashicorp/terraform/version"
 )
 
 // BuiltinEvalContext is an EvalContext implementation that is used by
diff --git a/internal/terraform/evaluate.go b/internal/terraform/evaluate.go
index 0beb29b21b..fd922528f5 100644
--- a/internal/terraform/evaluate.go
+++ b/internal/terraform/evaluate.go
@@ -6,6 +6,7 @@ import (
 	"os"
 	"path/filepath"
 	"sync"
+	"time"
 
 	"github.com/agext/levenshtein"
 	"github.com/hashicorp/hcl/v2"
@@ -60,6 +61,8 @@ type Evaluator struct {
 	// Changes is the set of proposed changes, embedded in a wrapper that
 	// ensures they can be safely accessed and modified concurrently.
 	Changes *plans.ChangesSync
+
+	PlanTimestamp time.Time
 }
 
 // Scope creates an evaluation scope for the given module path and optional
@@ -70,11 +73,12 @@ type Evaluator struct {
 // address.
 func (e *Evaluator) Scope(data lang.Data, self addrs.Referenceable, source addrs.Referenceable) *lang.Scope {
 	return &lang.Scope{
-		Data:       data,
-		SelfAddr:   self,
-		SourceAddr: source,
-		PureOnly:   e.Operation != walkApply && e.Operation != walkDestroy && e.Operation != walkEval,
-		BaseDir:    ".", // Always current working directory for now.
+		Data:          data,
+		SelfAddr:      self,
+		SourceAddr:    source,
+		PureOnly:      e.Operation != walkApply && e.Operation != walkDestroy && e.Operation != walkEval,
+		BaseDir:       ".", // Always current working directory for now.
+		PlanTimestamp: e.PlanTimestamp,
 	}
 }
 
diff --git a/internal/terraform/graph_walk_context.go b/internal/terraform/graph_walk_context.go
index 8060954059..8c80b8fc5f 100644
--- a/internal/terraform/graph_walk_context.go
+++ b/internal/terraform/graph_walk_context.go
@@ -3,6 +3,7 @@ package terraform
 import (
 	"context"
 	"sync"
+	"time"
 
 	"github.com/zclconf/go-cty/cty"
 
@@ -37,6 +38,7 @@ type ContextGraphWalker struct {
 	StopContext        context.Context
 	RootVariableValues InputValues
 	Config             *configs.Config
+	PlanTimestamp      time.Time
 
 	// This is an output. Do not set this, nor read it while a graph walk
 	// is in progress.
@@ -85,6 +87,7 @@ func (w *ContextGraphWalker) EvalContext() EvalContext {
 		Plugins:            w.Context.plugins,
 		VariableValues:     w.variableValues,
 		VariableValuesLock: &w.variableValuesLock,
+		PlanTimestamp:      w.PlanTimestamp,
 	}
 
 	ctx := &BuiltinEvalContext{
diff --git a/website/data/language-nav-data.json b/website/data/language-nav-data.json
index fe3c4d8d21..e489f8e71c 100644
--- a/website/data/language-nav-data.json
+++ b/website/data/language-nav-data.json
@@ -574,6 +574,10 @@
             "title": "<code>formatdate</code>",
             "href": "/language/functions/formatdate"
           },
+          {
+            "title": "<code>plantimestamp</code>",
+            "href": "/language/functions/plantimestamp"
+          },
           {
             "title": "<code>timeadd</code>",
             "href": "/language/functions/timeadd"
@@ -814,6 +818,7 @@
       { "title": "one", "path": "functions/one", "hidden": true },
       { "title": "parseint", "path": "functions/parseint", "hidden": true },
       { "title": "pathexpand", "path": "functions/pathexpand", "hidden": true },
+      { "title": "plantimestamp", "path": "functions/plantimestamp", "hidden": true },
       { "title": "pow", "path": "functions/pow", "hidden": true },
       { "title": "range", "path": "functions/range", "hidden": true },
       { "title": "regex", "path": "functions/regex", "hidden": true },
diff --git a/website/docs/language/functions/plantimestamp.mdx b/website/docs/language/functions/plantimestamp.mdx
new file mode 100644
index 0000000000..7b3a41e0d0
--- /dev/null
+++ b/website/docs/language/functions/plantimestamp.mdx
@@ -0,0 +1,54 @@
+---
+page_title: plantimestamp - Functions - Configuration Language
+description: |-
+  The plantimestamp functions a string representation of the date and time
+  during the plan.
+---
+
+# `plantimestamp` Function
+
+-> **Note:** This function is only available in Terraform v1.5 and later.
+
+`plantimestamp` returns a UTC timestamp string in [RFC 3339](https://tools.ietf.org/html/rfc3339) format.
+
+In the Terraform language, timestamps are conventionally represented as
+strings using [RFC 3339](https://tools.ietf.org/html/rfc3339)
+"Date and Time format" syntax, and so `plantimestamp` returns a string
+in this format.
+
+The result of this function will change for every plan operation. It is intended
+for use within [Custom Conditions](/terraform/language/expressions/custom-conditions)
+as a way to validate time sensitive resources such as TLS certificates.
+
+There are circumstances, such as during a Terraform [Refresh-only](/terraform/cli/commands/plan#planning-modes) plan, where
+the value for this function will be recomputed but not propagated to resources
+defined within the configuration. As such, it is recommended that this function
+only be used to compare against timestamps exported by providers and not against
+timestamps generated in the configuration.
+
+The `plantimestamp` function is not available within the Terraform console.
+
+## Examples
+
+```
+> plantimestamp()
+2018-05-13T07:44:12Z
+```
+
+```terraform
+check "terraform_io_certificate" {
+  data "tls_certificate" "terraform_io" {
+    url = "https://www.terraform.io/"
+  }
+
+  assert {
+    condition = timecmp(plantimestamp(), data.tls_certificate.terraform_io.certificates[0].not_after) < 0
+    error_message = "terraform.io certificate has expired"
+  }
+}
+```
+
+## Related Functions
+
+* [`timestamp`](/terraform/language/functions/timestamp) returns the current timestamp when it is evaluated
+during the apply step.
\ No newline at end of file
diff --git a/website/docs/language/functions/timestamp.mdx b/website/docs/language/functions/timestamp.mdx
index 3920e45271..ad9f8be08a 100644
--- a/website/docs/language/functions/timestamp.mdx
+++ b/website/docs/language/functions/timestamp.mdx
@@ -37,3 +37,5 @@ taken only once the plan is being applied.
 
 * [`formatdate`](/terraform/language/functions/formatdate) can convert the resulting timestamp to
   other date and time formats.
+* [`plantimestamp`](/terraform/language/functions/plantimestamp) will return a consistent timestamp
+  representing the date and time during the plan.
diff --git a/website/layouts/language.erb b/website/layouts/language.erb
index 56e5884f4e..4aa951904a 100644
--- a/website/layouts/language.erb
+++ b/website/layouts/language.erb
@@ -691,6 +691,10 @@
                 <a href="/docs/language/functions/formatdate.html">formatdate</a>
               </li>
 
+              <li>
+                <a href="/docs/language/functions/plantimestamp.html">plantimestamp</a>
+              </li>
+
               <li>
                 <a href="/docs/language/functions/timeadd.html">timeadd</a>
               </li>