回答編集履歴
2
関数名の修正
test
CHANGED
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@@ -24,13 +24,13 @@
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var target = new DateTime(nYear, nMonth, nDay, nHour, 0, 0);
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-
Debug.WriteLine($"{target} の直近の {nTargetHour:00}:00 は {Get
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Debug.WriteLine($"{target} の直近の {nTargetHour:00}:00 は {GetPastLatestHour(target, nTargetHour)}");
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}
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internal static DateTime Get
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internal static DateTime GetPastLatestHour(DateTime target, int nHour)
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{
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1
問題を理解していませんでした。
test
CHANGED
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@@ -1,13 +1,65 @@
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1
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質問の内容を間違えて読み取ってしまったので修正します。
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1
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-
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3
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今日のN時か昨日のN時かを返せば良いと思います。
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4
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5
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6
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7
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```csharp
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6
8
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7
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-
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9
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private void button1_Click(object sender, EventArgs e)
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9
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-
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{
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13
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Test(2018, 6, 14, 12, 13);
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14
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Test(2018, 6, 14, 14, 13);
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}
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internal static void Test(int nYear, int nMonth, int nDay, int nHour, int nTargetHour)
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{
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var target = new DateTime(nYear, nMonth, nDay, nHour, 0, 0);
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Debug.WriteLine($"{target} の直近の {nTargetHour:00}:00 は {GetNearestHour(target, nTargetHour)}");
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}
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internal static DateTime GetNearestHour(DateTime target, int nHour)
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{
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var sameDay = new DateTime(target.Year, target.Month, target.Day, nHour, 0, 0);
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if (sameDay <= target)
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{
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return sameDay; // 同じ日のnHour時
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}
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-
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return sameDay - TimeSpan.FromDays(1); // 一日前のnHour時
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}
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```
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出力：
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```text
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60
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2018/06/14 12:00:00 の直近の 13:00 は 2018/06/13 13:00:00
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2018/06/14 14:00:00 の直近の 13:00 は 2018/06/14 13:00:00
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65
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```
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