Added DateTime input and unix convertion

Author: alex8obrien

CommonsLibrary/CommonsLibrary.csproj

@@ -4,7 +4,7 @@
 		<TargetFramework>netstandard2.0</TargetFramework>
 		<ImplicitUsings>disable</ImplicitUsings>
 		<Title>C# Commons Library</Title>
-		<Version>7.0.0</Version>
+		<Version>7.1.0</Version>
 		<Authors>Alex O'Brien</Authors>
 		<PackageProjectUrl>https://github.com/alex8obrien/CommonsLibrary</PackageProjectUrl>
 		<PackageReadmeFile>README.md</PackageReadmeFile>

CommonsLibrary/StdInp.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Globalization;
 
 namespace CommonsLibrary
 {
@@ -79,5 +80,39 @@ public static string[] InputDelimitedArray(string msg, char delimiter)
             string[] array = input.Split(delimiter);
             return array;
         }
+
+        /// <summary>Gets formatted DateTime from the Console</summary>
+        /// <param name="msg">The message displayed to the user</param>
+        /// <param name="pattern">The DateTime pattern shown to the user</param>
+        /// <param name="culture">The culture-specific information for the DateTime</param>
+        /// <returns>A DateTime object representing the string inputted DateTime</returns>
+        public static DateTime GetDateTime(string msg, string pattern, CultureInfo culture)
+        {
+            bool valid;
+            DateTime result;
+
+            do
+            {
+                string input = Input($"{msg} ({pattern})");
+                valid = DateTime.TryParseExact(input, pattern, culture, DateTimeStyles.AllowWhiteSpaces, out result);
+
+                if (!valid)
+                    Console.WriteLine("Invalid date/time format.");
+
+            } while (!valid);
+
+            return result;
+        }
+
+        /// <summary>Gets user inputted DateTime and converts it to a unix timestamp</summary>
+        /// <param name="msg">The message displayed to the user</param>
+        /// <param name="pattern">The DateTime pattern shown to the user</param>
+        /// <param name="culture">The culture-specific information for the DateTime</param>
+        /// <returns>A unix timestamp representing the inputted DateTime</returns>
+        public static long GetUnixDateTime(string msg, string pattern, CultureInfo culture)
+        {
+            DateTime dt = GetDateTime(msg, pattern, culture);
+            return ((DateTimeOffset)dt).ToUnixTimeSeconds();
+        }
     }
 }