MonoRail/Castle.MonoRail.Framework/Helpers/DateFormatHelper.cs

   1 // Copyright 2004-2007 Castle Project - http://www.castleproject.org/
   2 //
   3 // Licensed under the Apache License, Version 2.0 (the "License");
   4 // you may not use this file except in compliance with the License.
   5 // You may obtain a copy of the License at
   6 //
   7 //     http://www.apache.org/licenses/LICENSE-2.0
   8 //
   9 // Unless required by applicable law or agreed to in writing, software
  10 // distributed under the License is distributed on an "AS IS" BASIS,
  11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 // See the License for the specific language governing permissions and
  13 // limitations under the License.
  14
  15 namespace Castle.MonoRail.Framework.Helpers
  16 {
  17         using System;
  18
  19         /// <summary>
  20         /// Simple helper for date formatting
  21         /// </summary>
  22         public class DateFormatHelper : AbstractHelper
  23         {
  24                 /// <summary>
  25                 /// Alternative representation of a difference
  26                 /// between the specified date and now. If within 24hr
  27                 /// it returns <c>Today</c>. If within 48hr it returns
  28                 /// <c>Yesterday</c>. If within 40 days it returns
  29                 /// <c>x days ago</c> and otherwise it returns
  30                 /// <c>x months ago</c>
  31                 /// <para>
  32                 /// TODO: Think about i18n
  33                 /// </para>
  34                 /// </summary>
  35                 /// <param name="date">The date in the past (should be equal or less than now)</param>
  36                 /// <returns></returns>
  37                 public String AlternativeFriendlyFormatFromNow(DateTime date)
  38                 {
  39                         TimeSpan now = new TimeSpan(DateTime.Now.Ticks);
  40                         TimeSpan cur = new TimeSpan(date.Ticks);
  41
  42                         TimeSpan diff = now.Subtract(cur);
  43
  44                         if (diff.TotalHours <= 24)
  45                         {
  46                                 return "Today";
  47                         }
  48                         else if (diff.TotalHours <= 48)
  49                         {
  50                                 return "Yesterday";
  51                         }
  52                         else if (diff.TotalDays <= 40)
  53                         {
  54                                 return String.Format("{0} days ago", diff.Days);
  55                         }
  56                         else
  57                         {
  58                                 return String.Format("{0} months ago", (diff.Days / 30));
  59                         }
  60                 }
  61
  62                 /// <summary>
  63                 /// Returns the difference from the
  64                 /// specified <c>date</c> the the current date
  65                 /// in a friendly string like "1 day ago"
  66                 /// <para>
  67                 /// TODO: Think about i18n
  68                 /// </para>
  69                 /// </summary>
  70                 /// <param name="date">The date in the past (should be equal or less than now)</param>
  71                 /// <returns></returns>
  72                 public String FriendlyFormatFromNow(DateTime date)
  73                 {
  74                         TimeSpan now = new TimeSpan(DateTime.Now.Ticks);
  75                         TimeSpan cur = new TimeSpan(date.Ticks);
  76
  77                         TimeSpan diff = now.Subtract(cur);
  78
  79                         if (diff.TotalSeconds == 0)
  80                         {
  81                                 return "Just now";
  82                         }
  83
  84                         if (diff.Days == 0)
  85                         {
  86                                 if (diff.Hours == 0)
  87                                 {
  88                                         if (diff.Minutes == 0)
  89                                         {
  90                                                 return String.Format("{0} second{1} ago",
  91                                                         diff.Seconds, diff.Seconds > 1 ? "s" : String.Empty);
  92                                         }
  93                                         else
  94                                         {
  95                                                 return String.Format("{0} minute{1} ago",
  96                                                         diff.Minutes, diff.Minutes > 1 ? "s" : String.Empty);
  97                                         }
  98                                 }
  99                                 else
 100                                 {
 101                                         return String.Format("{0} hour{1} ago",
 102                                                 diff.Hours, diff.Hours > 1 ? "s" : String.Empty);
 103                                 }
 104                         }
 105                         else
 106                         {
 107                                 return String.Format("{0} day{1} ago",
 108                                         diff.Days, diff.Days > 1 ? "s" : String.Empty);
 109                         }
 110                 }
 111
 112                 /// <summary>
 113                 /// Formats to short date
 114                 /// </summary>
 115                 /// <param name="date"></param>
 116                 /// <returns>Short date, or <c>String.Empty</c> if <paramref name="date"/> is <c>null</c>.</returns>
 117                 public String ToShortDate(DateTime? date)
 118                 {
 119                         return date.HasValue ? date.Value.ToShortDateString() : string.Empty;
 120                 }
 121
 122                 /// <summary>
 123                 /// Formats to short date
 124                 /// </summary>
 125                 /// <param name="date"></param>
 126                 /// <returns>Short date and time, or <c>String.Empty</c> if <paramref name="date"/> is <c>null</c>.</returns>
 127                 public String ToShortDateTime(DateTime? date)
 128                 {
 129                         return date.HasValue ? date.Value.ToShortDateString() + " " + date.Value.ToShortTimeString() : string.Empty;
 130                 }
 131         }
 132 }