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using System;
namespace Org.BouncyCastle.Utilities.Date
{
public class DateTimeUtilities
{
public static readonly DateTime UnixEpoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
private DateTimeUtilities()
{
}
/// <summary>
/// Return the number of milliseconds since the Unix epoch (1 Jan., 1970 UTC) for a given DateTime value.
/// </summary>
/// <param name="dateTime">A UTC DateTime value not before epoch.</param>
/// <returns>Number of whole milliseconds after epoch.</returns>
/// <exception cref="ArgumentException">'dateTime' is before epoch.</exception>
public static long DateTimeToUnixMs(
DateTime dateTime)
{
if (dateTime.CompareTo(UnixEpoch) < 0)
throw new ArgumentException("DateTime value may not be before the epoch", "dateTime");
return (dateTime.Ticks - UnixEpoch.Ticks) / TimeSpan.TicksPerMillisecond;
}
/// <summary>
/// Create a DateTime value from the number of milliseconds since the Unix epoch (1 Jan., 1970 UTC).
/// </summary>
/// <param name="unixMs">Number of milliseconds since the epoch.</param>
/// <returns>A UTC DateTime value</returns>
public static DateTime UnixMsToDateTime(
long unixMs)
{
return new DateTime(unixMs * TimeSpan.TicksPerMillisecond + UnixEpoch.Ticks, DateTimeKind.Utc);
}
/// <summary>
/// Return the current number of milliseconds since the Unix epoch (1 Jan., 1970 UTC).
/// </summary>
public static long CurrentUnixMs()
{
return DateTimeToUnixMs(DateTime.UtcNow);
}
}
}
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