Extension methods for Noda Time - to

DateTimeExtensions.cs

using System;

using NodaTime;
using NodaTime.TimeZones;

namespace Whatever
{
    public static class DateTimeExtensions
    {
        public static DateTime AdjustTo(this DateTime date, string timeZoneId)
        {
            if (date == DateTime.MinValue)
                return date;

            DateTimeZone.SetProvider(new BclTimeZoneProvider());

            var zone = DateTimeZone.ForId(timeZoneId ?? "UTC");

            var dateTime = new ZonedDateTime(Instant.FromDateTimeUtc(date.ToUniversalTime()), zone);

            return dateTime.ToDateTimeUnspecified();
        }

        public static DateTime ToUtc(this DateTime date)
        {
            return date.ToUtc("UTC");
        }

        public static DateTime ToUtc(this DateTime date, string timeZoneId)
        {
            //Tell noda time to use the BCL for time zones
            DateTimeZone.SetProvider(new BclTimeZoneProvider());

            //This will ensure that the time zone is valid.
            DateTimeZone dateTimeZone = DateTimeZone.ForId(timeZoneId);

            //Has no time zone info
            LocalDateTime rawDateTime = LocalDateTime.FromDateTime(date);

            ZonedDateTime dateTime = dateTimeZone.AtExactly(rawDateTime);
            return dateTime.ToDateTimeUtc();
        }
    }
}