sync full source from private myoffice

MyOffice.Core/Extensions/DateTimeExtensions.cs

@@ -0,0 +1,19 @@
+namespace MyOffice.Core.Extensions;
+
+public static class DateTimeExtensions
+{
+	public static DateTime StartOfDay(this DateTime dateTime)
+	{
+		return dateTime.Date;
+	}
+
+	public static DateTime EndOfDay(this DateTime dateTime)
+	{
+		return dateTime.AddDays(1).AddTicks(-1);
+	}
+
+	public static DateTime ToUtc(this DateTime dateTime)
+	{
+		return new DateTime(dateTime.Ticks, DateTimeKind.Utc);
+	}
+}