48 lines
1.8 KiB
C#
48 lines
1.8 KiB
C#
using System.Text.Json;
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using System.Text.Json.Serialization;
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namespace Elternbeirat.Contracts;
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/// <summary>
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/// JSON converter that reads and writes a PocketBase date as a calendar date
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/// (<see cref="DateOnly"/>), keeping the day and dropping the time-of-day.
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/// </summary>
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/// <remarks>
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/// PocketBase has no date-only field type: it stores every date as a UTC
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/// instant with a time-of-day (e.g. an editor's <c>2 Jan 00:00</c> Berlin is
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/// stored as <c>"2026-01-01 22:00:00.000Z"</c>). The day the editor meant is
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/// therefore the day <em>in Berlin</em>, not the day of the raw UTC string. This
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/// converter reuses the same UTC->Berlin conversion as
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/// <see cref="LocalDateTimeConverter"/> and then keeps only the date, so the day
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/// shown is the day that was entered -- with no time-of-day and no off-by-one.
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/// </remarks>
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/// <example>
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/// Apply it to a calendar-day field of a contract:
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/// <code>
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/// [JsonConverter(typeof(DateOnlyConverter))]
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/// public DateOnly Date { get; init; }
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/// </code>
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/// </example>
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/// <seealso cref="WallClock"/>
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public sealed class DateOnlyConverter : JsonConverter<DateOnly>
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{
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/// <inheritdoc/>
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/// <exception cref="FormatException">
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/// The stored value is not a valid date string.
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/// </exception>
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public override DateOnly Read(
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ref Utf8JsonReader reader,
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Type typeToConvert,
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JsonSerializerOptions options)
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=> WallClock.Parse(reader.GetString()) is { } berlin
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? DateOnly.FromDateTime(berlin)
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: default;
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/// <inheritdoc/>
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public override void Write(
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Utf8JsonWriter writer,
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DateOnly value,
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JsonSerializerOptions options)
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=> writer.WriteStringValue(WallClock.Format(value.ToDateTime(TimeOnly.MinValue)));
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}
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