MONSTER: Rename Monorepo to Modules, only keep Projects under Modules.*

Language/DateTimeEx.vb

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+Imports System.Runtime.CompilerServices
+
+Public Module DateTimeEx
+    Const UnixEraStartTicks As Long = 621355968000000000
+    <Extension> Public Function UnixTimestamp(value As Date) As Long
+        Dim UnixEraTicks = value.Ticks - UnixEraStartTicks
+        Return UnixEraTicks \ 10000
+    End Function
+    Public Function DateFromUnix(timestamp As Long) As Date
+        Return New Date(UnixEraStartTicks + timestamp * 10000)
+    End Function
+End Module