How Can I Create DateTimes with Specific Time Zones in C#?

Working with DateTimes and Time Zones in C#

Many programming tasks, especially in testing, demand the creation of DateTime objects tied to specific time zones. While the DateTime constructor handles local, UTC, and unspecified times, using TimeZoneInfo offers more precise control.

Leveraging TimeZoneInfo

Instead of relying solely on the DateTime constructor's TimeZone property, TimeZoneInfo provides superior time zone management and conversion capabilities.

Custom DateTime Structure

This example uses a custom structure, DateTimeWithZone, to encapsulate a DateTime and its associated time zone:

<code class="language-csharp">public struct DateTimeWithZone
{
    private readonly DateTime utcDateTime;
    private readonly TimeZoneInfo timeZone;

    public DateTimeWithZone(DateTime dateTime, TimeZoneInfo timeZone)
    {
        var dateTimeUnspec = DateTime.SpecifyKind(dateTime, DateTimeKind.Unspecified);
        utcDateTime = TimeZoneInfo.ConvertTimeToUtc(dateTimeUnspec, timeZone);
        this.timeZone = timeZone;
    }

    public DateTime UniversalTime => utcDateTime;
    public TimeZoneInfo TimeZone => timeZone;
    public DateTime LocalTime => TimeZoneInfo.ConvertTime(utcDateTime, timeZone);
}</code>

Practical Application

To create a DateTimeWithZone object in the Pacific Standard Time (PST) zone:

<code class="language-csharp">var pstDateTime = new DateTimeWithZone(new DateTime(2023, 1, 1), TimeZoneInfo.FindSystemTimeZoneById("Pacific Standard Time"));</code>

This approach enables seamless work with DateTime objects in specific time zones, facilitating conversions between UTC and local time as required.

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