src/MyWebLog.Data/Interfaces.fs

@@ -1,9 +1,9 @@
 namespace MyWebLog.Data
 
-open System
 open System.Threading.Tasks
 open MyWebLog
 open MyWebLog.ViewModels
+open NodaTime
 
 /// The result of a category deletion attempt
 type CategoryDeleteResult =
@@ -137,7 +137,7 @@ type IPostData =
         WebLogId -> tag : string -> pageNbr : int -> postsPerPage : int -> Task<Post list>
     
     /// Find the next older and newer post for the given published date/time (excluding revisions and prior permalinks)
-    abstract member FindSurroundingPosts : WebLogId -> publishedOn : DateTime -> Task<Post option * Post option>
+    abstract member FindSurroundingPosts : WebLogId -> publishedOn : Instant -> Task<Post option * Post option>
     
     /// Restore posts from a backup
     abstract member Restore : Post list -> Task<unit>

src/MyWebLog.Data/Postgres/PostgresPostData.fs

@@ -1,9 +1,9 @@
 namespace MyWebLog.Data.Postgres
 
-open System
 open MyWebLog
 open MyWebLog.Data
 open Newtonsoft.Json
+open NodaTime
 open Npgsql
 open Npgsql.FSharp
 
@@ -238,11 +238,11 @@ type PostgresPostData (conn : NpgsqlConnection) =
         |> Sql.executeAsync Map.toPost
     
     /// Find the next newest and oldest post from a publish date for the given web log
-    let findSurroundingPosts webLogId (publishedOn : DateTime) = backgroundTask {
+    let findSurroundingPosts webLogId (publishedOn : Instant) = backgroundTask {
         let queryParams = Sql.parameters [
             webLogIdParam webLogId
-            "@status",      Sql.string      (PostStatus.toString Published)
+            typedParam "@publishedOn" publishedOn
-            "@publishedOn", Sql.timestamptz publishedOn
+            "@status", Sql.string (PostStatus.toString Published)
         ]
         let! older =
             Sql.existingConnection conn

src/MyWebLog.Data/SQLite/SQLitePostData.fs

@@ -1,10 +1,10 @@
 namespace MyWebLog.Data.SQLite
 
-open System
 open System.Threading.Tasks
 open Microsoft.Data.Sqlite
 open MyWebLog
 open MyWebLog.Data
+open NodaTime
 
 /// SQLite myWebLog post data implementation        
 type SQLitePostData (conn : SqliteConnection) =
@@ -487,7 +487,7 @@ type SQLitePostData (conn : SqliteConnection) =
     }
     
     /// Find the next newest and oldest post from a publish date for the given web log
-    let findSurroundingPosts webLogId (publishedOn : DateTime) = backgroundTask {
+    let findSurroundingPosts webLogId (publishedOn : Instant) = backgroundTask {
         use cmd = conn.CreateCommand ()
         cmd.CommandText <- $"
             {selectPost}
@@ -498,7 +498,7 @@ type SQLitePostData (conn : SqliteConnection) =
              LIMIT 1"
         addWebLogId cmd webLogId
         [ cmd.Parameters.AddWithValue ("@status", PostStatus.toString Published)
-          cmd.Parameters.AddWithValue ("@publishedOn", publishedOn)
+          cmd.Parameters.AddWithValue ("@publishedOn", instantParam publishedOn)
         ] |> ignore
         use! rdr = cmd.ExecuteReaderAsync ()
         let! older = backgroundTask {

src/MyWebLog.Domain/SupportTypes.fs

@@ -138,6 +138,8 @@ module ExplicitRating =
         | x       -> raise (invalidArg "rating" $"{x} is not a valid explicit rating")
 
 
+open NodaTime.Text
+
 /// A podcast episode
 type Episode =
     {   /// The URL to the media file for the episode (may be permalink)
@@ -216,6 +218,10 @@ module Episode =
             EpisodeDescription = None
         }
     
+    /// Format a duration for an episode
+    let formatDuration ep =
+        ep.Duration |> Option.map (DurationPattern.CreateWithInvariantCulture("H:mm:ss").Format)
+
 
 open Markdig
 open Markdown.ColorCode

src/MyWebLog.Domain/ViewModels.fs

@@ -3,7 +3,6 @@
 open System
 open MyWebLog
 open NodaTime
-open NodaTime.Text
 
 /// Helper functions for view models
 [<AutoOpen>]
@@ -706,7 +705,6 @@ type EditPostModel =
             | Some rev -> rev
             | None -> Revision.empty
         let post    = if post.Metadata |> List.isEmpty then { post with Metadata = [ MetaItem.empty ] } else post
-        let format  = DurationPattern.CreateWithInvariantCulture("H:mm:ss").Format
         let episode = defaultArg post.Episode Episode.empty
         {   PostId             = PostId.toString post.Id
             Title              = post.Title
@@ -726,7 +724,7 @@ type EditPostModel =
             IsEpisode          = Option.isSome post.Episode
             Media              = episode.Media
             Length             = episode.Length
-            Duration           = defaultArg (episode.Duration |> Option.map format) ""
+            Duration           = defaultArg (Episode.formatDuration episode) ""
             MediaType          = defaultArg episode.MediaType ""
             ImageUrl           = defaultArg episode.ImageUrl ""
             Subtitle           = defaultArg episode.Subtitle ""

src/MyWebLog/Caches.fs

@@ -11,6 +11,7 @@ module Extensions =
     open Microsoft.AspNetCore.Antiforgery
     open Microsoft.Extensions.Configuration
     open Microsoft.Extensions.DependencyInjection
+    open NodaTime
     
     /// Hold variable for the configured generator string
     let mutable private generatorString : string option = None
@@ -20,6 +21,9 @@ module Extensions =
         /// The anti-CSRF service
         member this.AntiForgery = this.RequestServices.GetRequiredService<IAntiforgery> ()
         
+        /// The system clock
+        member this.Clock = this.RequestServices.GetRequiredService<IClock> ()
+        
         /// The cross-site request forgery token set for this request
         member this.CsrfTokenSet = this.AntiForgery.GetAndStoreTokens this
 

src/MyWebLog/Handlers/Admin.fs

@@ -5,6 +5,7 @@ open System.Threading.Tasks
 open Giraffe
 open MyWebLog
 open MyWebLog.ViewModels
+open NodaTime
 
 /// ~~ DASHBOARDS ~~
 module Dashboard =
@@ -344,7 +345,8 @@ module Theme =
                 do! asset.Open().CopyToAsync stream
                 do! data.ThemeAsset.Save
                         {   Id        = ThemeAssetId (themeId, assetName)
-                            UpdatedOn = asset.LastWriteTime.DateTime
+                            UpdatedOn = LocalDateTime.FromDateTime(asset.LastWriteTime.DateTime)
+                                            .InZoneLeniently(DateTimeZone.Utc).ToInstant ()
                             Data      = stream.ToArray ()
                         }
     }

src/MyWebLog/Handlers/Feed.fs

@@ -95,8 +95,8 @@ let private toFeedItem webLog (authors : MetaItem list) (cats : DisplayCategory[
     let item = SyndicationItem (
         Id              = WebLog.absoluteUrl webLog post.Permalink,
         Title           = TextSyndicationContent.CreateHtmlContent post.Title,
-        PublishDate     = DateTimeOffset post.PublishedOn.Value,
+        PublishDate     = post.PublishedOn.Value.ToDateTimeOffset (),
-        LastUpdatedTime = DateTimeOffset post.UpdatedOn,
+        LastUpdatedTime = post.UpdatedOn.ToDateTimeOffset (),
         Content         = TextSyndicationContent.CreatePlaintextContent plainText)
     item.AddPermalink (Uri item.Id)
     
@@ -163,8 +163,8 @@ let private addEpisode webLog (podcast : PodcastOptions) (episode : Episode) (po
     item.ElementExtensions.Add ("author",   Namespace.iTunes, podcast.DisplayedAuthor)
     item.ElementExtensions.Add ("explicit", Namespace.iTunes, epExplicit)
     episode.Subtitle |> Option.iter (fun it -> item.ElementExtensions.Add ("subtitle", Namespace.iTunes, it))
-    episode.Duration
+    Episode.formatDuration episode
-    |> Option.iter (fun it -> item.ElementExtensions.Add ("duration", Namespace.iTunes, it.ToString """hh\:mm\:ss"""))
+    |> Option.iter (fun it -> item.ElementExtensions.Add ("duration", Namespace.iTunes, it))
     
     match episode.ChapterFile with
     | Some chapters ->
@@ -381,7 +381,7 @@ let createFeed (feedType : FeedType) posts : HttpHandler = fun next ctx -> backg
     addNamespace feed "content" Namespace.content
     setTitleAndDescription feedType webLog cats feed
     
-    feed.LastUpdatedTime <- (List.head posts).UpdatedOn |> DateTimeOffset
+    feed.LastUpdatedTime <- (List.head posts).UpdatedOn.ToDateTimeOffset ()
     feed.Generator       <- ctx.Generator
     feed.Items           <- posts |> Seq.ofList |> Seq.map toItem
     feed.Language        <- "en"

src/MyWebLog/Handlers/Helpers.fs

@@ -419,10 +419,11 @@ let getCategoryIds slug ctx =
 
 open System
 open System.Globalization
+open NodaTime
 
 /// Parse a date/time to UTC 
 let parseToUtc (date : string) =
-    DateTime.Parse (date, null, DateTimeStyles.AdjustToUniversal)
+    Instant.FromDateTimeUtc (DateTime.Parse (date, null, DateTimeStyles.AdjustToUniversal))
 
 open Microsoft.Extensions.DependencyInjection
 open Microsoft.Extensions.Logging

src/MyWebLog/Handlers/Page.fs

@@ -139,15 +139,13 @@ let previewRevision (pgId, revDate) : HttpHandler = requireAccess Author >=> fun
     | _, None -> return! Error.notFound next ctx
 }
 
-open System
-
 // POST /admin/page/{id}/revision/{revision-date}/restore
 let restoreRevision (pgId, revDate) : HttpHandler = requireAccess Author >=> fun next ctx -> task {
     match! findPageRevision pgId revDate ctx with
     | Some pg, Some rev when canEdit pg.AuthorId ctx ->
         do! ctx.Data.Page.Update
                 { pg with
-                    Revisions = { rev with AsOf = DateTime.UtcNow }
+                    Revisions = { rev with AsOf = ctx.Clock.GetCurrentInstant () }
                                   :: (pg.Revisions |> List.filter (fun r -> r.AsOf <> rev.AsOf))
                 }
         do! addMessage ctx { UserMessage.success with Message = "Revision restored successfully" }
@@ -173,7 +171,7 @@ let deleteRevision (pgId, revDate) : HttpHandler = requireAccess Author >=> fun
 let save : HttpHandler = requireAccess Author >=> fun next ctx -> task {
     let! model   = ctx.BindFormAsync<EditPageModel> ()
     let  data    = ctx.Data
-    let  now     = DateTime.UtcNow
+    let  now     = ctx.Clock.GetCurrentInstant ()
     let  tryPage =
         if model.IsNew then
             { Page.empty with

src/MyWebLog/Handlers/Post.fs

@@ -52,9 +52,9 @@ let preparePostList webLog posts listType (url : string) pageNbr perPage (data :
     let! olderPost, newerPost =
         match listType with
         | SinglePost ->
-            let post     = List.head posts
+            let post   = List.head posts
-            let dateTime = defaultArg post.PublishedOn post.UpdatedOn
+            let target = defaultArg post.PublishedOn post.UpdatedOn
-            data.Post.FindSurroundingPosts webLog.Id dateTime
+            data.Post.FindSurroundingPosts webLog.Id target
         | _ -> Task.FromResult (None, None)
     let newerLink =
         match listType, pageNbr with
@@ -350,7 +350,7 @@ let restoreRevision (postId, revDate) : HttpHandler = requireAccess Author >=> f
     | Some post, Some rev when canEdit post.AuthorId ctx ->
         do! ctx.Data.Post.Update
                 { post with
-                    Revisions = { rev with AsOf = DateTime.UtcNow }
+                    Revisions = { rev with AsOf = ctx.Clock.GetCurrentInstant () }
                                   :: (post.Revisions |> List.filter (fun r -> r.AsOf <> rev.AsOf))
                 }
         do! addMessage ctx { UserMessage.success with Message = "Revision restored successfully" }
@@ -376,7 +376,6 @@ let deleteRevision (postId, revDate) : HttpHandler = requireAccess Author >=> fu
 let save : HttpHandler = requireAccess Author >=> fun next ctx -> task {
     let! model   = ctx.BindFormAsync<EditPostModel> ()
     let  data    = ctx.Data
-    let  now     = DateTime.UtcNow
     let  tryPost =
         if model.IsNew then
             { Post.empty with
@@ -389,7 +388,7 @@ let save : HttpHandler = requireAccess Author >=> fun next ctx -> task {
     | Some post when canEdit post.AuthorId ctx ->
         let priorCats   = post.CategoryIds
         let updatedPost =
-            model.UpdatePost post now
+            model.UpdatePost post (ctx.Clock.GetCurrentInstant ())
             |> function
             | post ->
                 if model.SetPublished then

src/MyWebLog/Handlers/Routes.fs

@@ -94,7 +94,7 @@ module Asset =
         | Some asset ->
             match Upload.checkModified asset.UpdatedOn ctx with
             | Some threeOhFour -> return! threeOhFour next ctx
-            | None -> return! Upload.sendFile asset.UpdatedOn path asset.Data next ctx
+            | None -> return! Upload.sendFile (asset.UpdatedOn.ToDateTimeUtc ()) path asset.Data next ctx
         | None -> return! Error.notFound next ctx
     }
 

src/MyWebLog/Handlers/Upload.fs

@@ -29,15 +29,17 @@ module private Helpers =
 
 // ~~ SERVING UPLOADS ~~
 
+open System.Globalization
 open Giraffe
 open Microsoft.AspNetCore.Http
+open NodaTime
 
 /// Determine if the file has been modified since the date/time specified by the If-Modified-Since header
 let checkModified since (ctx : HttpContext) : HttpHandler option =
     match ctx.Request.Headers.IfModifiedSince with
     | it when it.Count < 1 -> None
-    | it when since > DateTime.Parse it[0] -> None
+    | it when since > Instant.FromDateTimeUtc (DateTime.Parse (it[0], null, DateTimeStyles.AdjustToUniversal)) -> None
-    | _ -> Some (setStatusCode 304 >=> setBodyFromString "Not Modified")
+    | _ -> Some (setStatusCode 304)
 
 
 open Microsoft.AspNetCore.Http.Headers
@@ -73,7 +75,7 @@ let serve (urlParts : string seq) : HttpHandler = fun next ctx -> task {
             | Some upload ->
                 match checkModified upload.UpdatedOn ctx with
                 | Some threeOhFour -> return! threeOhFour next ctx
-                | None -> return! sendFile upload.UpdatedOn path upload.Data next ctx
+                | None -> return! sendFile (upload.UpdatedOn.ToDateTimeUtc ()) path upload.Data next ctx
             | None -> return! Error.notFound next ctx
     else
         return! Error.notFound next ctx
@@ -143,7 +145,8 @@ let save : HttpHandler = requireAccess Author >=> fun next ctx -> task {
         let upload    = Seq.head ctx.Request.Form.Files
         let fileName  = String.Concat (makeSlug (Path.GetFileNameWithoutExtension upload.FileName),
                                        Path.GetExtension(upload.FileName).ToLowerInvariant ())
-        let  localNow = WebLog.localTime ctx.WebLog DateTime.Now
+        let  now      = ctx.Clock.GetCurrentInstant ()
+        let  localNow = WebLog.localTime ctx.WebLog now
         let  year     = localNow.ToString "yyyy"
         let  month    = localNow.ToString "MM"
         let! form     = ctx.BindFormAsync<UploadFileModel> ()
@@ -156,7 +159,7 @@ let save : HttpHandler = requireAccess Author >=> fun next ctx -> task {
                 {   Id        = UploadId.create ()
                     WebLogId  = ctx.WebLog.Id
                     Path      = Permalink $"{year}/{month}/{fileName}"
-                    UpdatedOn = DateTime.UtcNow
+                    UpdatedOn = now
                     Data      = stream.ToArray ()
                 }
             do! ctx.Data.Upload.Add file

src/MyWebLog/Handlers/User.fs

@@ -4,6 +4,7 @@ module MyWebLog.Handlers.User
 open System
 open System.Security.Cryptography
 open System.Text
+open NodaTime
 
 // ~~ LOG ON / LOG OFF ~~
 
@@ -147,7 +148,9 @@ let private showMyInfo (model : EditMyInfoModel) (user : WebLogUser) : HttpHandl
     |> addToHash ViewContext.Model model
     |> addToHash "access_level"    (AccessLevel.toString user.AccessLevel)
     |> addToHash "created_on"      (WebLog.localTime ctx.WebLog user.CreatedOn)
-    |> addToHash "last_seen_on"    (WebLog.localTime ctx.WebLog (defaultArg user.LastSeenOn DateTime.UnixEpoch))
+    |> addToHash "last_seen_on"    (WebLog.localTime ctx.WebLog
+                                         (defaultArg user.LastSeenOn (Instant.FromUnixTimeSeconds 0)))
+                                         
     |> adminView "my-info" next ctx
 
 
@@ -198,9 +201,9 @@ let save : HttpHandler = requireAccess WebLogAdmin >=> fun next ctx -> task {
     let  tryUser =
         if model.IsNew then
             { WebLogUser.empty with
-                Id = WebLogUserId.create ()
+                Id        = WebLogUserId.create ()
-                WebLogId = ctx.WebLog.Id
+                WebLogId  = ctx.WebLog.Id
-                CreatedOn = DateTime.UtcNow
+                CreatedOn = ctx.Clock.GetCurrentInstant ()
             } |> someTask
         else data.WebLogUser.FindById (WebLogUserId model.Id) ctx.WebLog.Id
     match! tryUser with
@@ -227,4 +230,3 @@ let save : HttpHandler = requireAccess WebLogAdmin >=> fun next ctx -> task {
                 next ctx
     | None -> return! Error.notFound next ctx
 }
-

src/MyWebLog/Maintenance.fs

@@ -4,6 +4,7 @@ open System
 open System.IO
 open Microsoft.Extensions.DependencyInjection
 open MyWebLog.Data
+open NodaTime
 
 /// Create the web log information
 let private doCreateWebLog (args : string[]) (sp : IServiceProvider) = task {
@@ -42,7 +43,7 @@ let private doCreateWebLog (args : string[]) (sp : IServiceProvider) = task {
     
     // Create the admin user
     let salt = Guid.NewGuid ()
-    let now  = DateTime.UtcNow
+    let now  = SystemClock.Instance.GetCurrentInstant ()
     
     do! data.WebLogUser.Add 
             { WebLogUser.empty with
@@ -165,7 +166,7 @@ module Backup =
             Id : ThemeAssetId
             
             /// The updated date for this asset
-            UpdatedOn : DateTime
+            UpdatedOn : Instant
             
             /// The data for this asset, base-64 encoded
             Data : string
@@ -197,7 +198,7 @@ module Backup =
             Path : Permalink
             
             /// The date/time this upload was last updated (file time)
-            UpdatedOn : DateTime
+            UpdatedOn : Instant
             
             /// The data for the upload, base-64 encoded
             Data : string

src/MyWebLog/Program.fs

@@ -3,8 +3,6 @@ open Microsoft.Data.Sqlite
 open Microsoft.Extensions.Configuration
 open Microsoft.Extensions.Logging
 open MyWebLog
-open Newtonsoft.Json
-open Npgsql
 
 /// Middleware to derive the current web log
 type WebLogMiddleware (next : RequestDelegate, log : ILogger<WebLogMiddleware>) =
@@ -31,6 +29,9 @@ type WebLogMiddleware (next : RequestDelegate, log : ILogger<WebLogMiddleware>)
 open System
 open Microsoft.Extensions.DependencyInjection
 open MyWebLog.Data
+open Newtonsoft.Json
+open NodaTime
+open Npgsql
 
 /// Logic to obtain a data connection and implementation based on configured values
 module DataImplementation =
@@ -119,6 +120,7 @@ let rec main args =
     let sp = builder.Services.BuildServiceProvider ()
     let data, serializer = DataImplementation.get sp
     let _ = builder.Services.AddSingleton<JsonSerializer> serializer
+    let _ = builder.Services.AddSingleton<IClock> SystemClock.Instance
     
     task {
         do! data.StartUp ()