1 files changed, 47 insertions, 0 deletions
diff --git a/Crypto/src/util/date/DateTimeUtilities.cs b/Crypto/src/util/date/DateTimeUtilities.cs
new file mode 100644
index 000000000..311ad5d37
--- /dev/null
+++ b/Crypto/src/util/date/DateTimeUtilities.cs
@@ -0,0 +1,47 @@
+using System;
+
+namespace Org.BouncyCastle.Utilities.Date
+{
+ public class DateTimeUtilities
+ {
+ public static readonly DateTime UnixEpoch = new DateTime(1970, 1, 1);
+
+ 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);
+ }
+
+ /// <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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