csharp/test/Apache.Arrow.Tests/Extensions/DateTimeOffsetExtensions.cs

// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You under the Apache License, Version 2.0
// (the "License"); you may not use this file except in compliance with
// the License.  You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

using System;

namespace Apache.Arrow.Tests
{
    public static class DateTimeOffsetExtensions
    {
        public static DateTimeOffset Truncate(this DateTimeOffset dateTimeOffset, TimeSpan offset)
        {
            if (offset == TimeSpan.Zero)
            {
                return dateTimeOffset;
            }

            if (dateTimeOffset == DateTimeOffset.MinValue || dateTimeOffset == DateTimeOffset.MaxValue)
            {
                return dateTimeOffset;
            }

            return dateTimeOffset.AddTicks(-(dateTimeOffset.Ticks % offset.Ticks));
        }
            
    }
}