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annotate MetroWpf/MetroWpf.Framework/Extensions/DateTimeExtensions.cs @ 109:11994ccdc50b

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First wave of tests complete
author stevenhollidge <stevenhollidge@hotmail.com>
date Sun, 06 May 2012 20:37:32 +0100
parents 060f02cd4591
children
rev   line source
15
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1 using System;
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2 using System.Globalization;
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3
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4 namespace MetroWpf
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5 {
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6 /// <summary>
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7 /// Extension methods for the DateTimeOffset data type.
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8 /// </summary>
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9 public static class DateTimeExtensions
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10 {
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11 #region · Extensions ·
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12
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13 /// <summary>
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14 /// Calculates the age based on today.
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15 /// </summary>
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16 /// <param name="dateOfBirth">The date of birth.</param>
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17 /// <returns>The calculated age.</returns>
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18 public static int CalculateAge(this DateTime dateOfBirth)
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19 {
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20 return CalculateAge(dateOfBirth, DateTime.Today);
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21 }
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22
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23 /// <summary>
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24 /// Calculates the age based on a passed reference date.
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25 /// </summary>
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26 /// <param name="dateOfBirth">The date of birth.</param>
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27 /// <param name="referenceDate">The reference date to calculate on.</param>
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28 /// <returns>The calculated age.</returns>
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29 public static int CalculateAge(this DateTime dateOfBirth, DateTime referenceDate)
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30 {
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31 int years = referenceDate.Year - dateOfBirth.Year;
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32
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33 if (referenceDate.Month < dateOfBirth.Month
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34 || (referenceDate.Month == dateOfBirth.Month
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35 && referenceDate.Day < dateOfBirth.Day))
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36 {
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37 --years;
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38 }
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39
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40 return years;
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41 }
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42
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43 /// <summary>
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44 /// Returns the number of days in the month of the provided date.
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45 /// </summary>
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46 /// <param name="date">The date.</param>
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47 /// <returns>The number of days.</returns>
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48 public static int GetCountDaysOfMonth(this DateTime date)
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49 {
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50 var nextMonth = date.AddMonths(1);
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51
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52 return new DateTime(nextMonth.Year, nextMonth.Month, 1).AddDays(-1).Day;
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53 }
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54
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55 /// <summary>
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56 /// Returns the first day of the month of the provided date.
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57 /// </summary>
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58 /// <param name="date">The date.</param>
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59 /// <returns>The first day of the month</returns>
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60 public static DateTime GetFirstDayOfMonth(this DateTime date)
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61 {
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62 return new DateTime(date.Year, date.Month, 1);
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63 }
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64
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65 /// <summary>
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66 /// Returns the first day of the month of the provided date.
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67 /// </summary>
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68 /// <param name="date">The date.</param>
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69 /// <param name="dayOfWeek">The desired day of week.</param>
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70 /// <returns>The first day of the month</returns>
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71 public static DateTime GetFirstDayOfMonth(this DateTime date, DayOfWeek dayOfWeek)
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72 {
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73 var dt = date.GetFirstDayOfMonth();
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74
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75 while (dt.DayOfWeek != dayOfWeek)
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76 {
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77 dt = dt.AddDays(1);
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78 }
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79
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80 return dt;
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81 }
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82
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83 /// <summary>
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84 /// Returns the last day of the month of the provided date.
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85 /// </summary>
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86 /// <param name="date">The date.</param>
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87 /// <returns>The last day of the month.</returns>
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88 public static DateTime GetLastDayOfMonth(this DateTime date)
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89 {
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90 return new DateTime(date.Year, date.Month, GetCountDaysOfMonth(date));
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91 }
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92
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93 /// <summary>
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94 /// Returns the last day of the month of the provided date.
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95 /// </summary>
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96 /// <param name="date">The date.</param>
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97 /// <param name="dayOfWeek">The desired day of week.</param>
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98 /// <returns>The date time</returns>
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99 public static DateTime GetLastDayOfMonth(this DateTime date, DayOfWeek dayOfWeek)
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100 {
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101 var dt = date.GetLastDayOfMonth();
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102
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103 while (dt.DayOfWeek != dayOfWeek)
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104 {
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105 dt = dt.AddDays(-1);
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106 }
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107
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108 return dt;
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109 }
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110
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111 /// <summary>
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112 /// Indicates whether the date is today.
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113 /// </summary>
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114 /// <param name="dt">The date.</param>
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115 /// <returns>
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116 /// <c>true</c> if the specified date is today; otherwise, <c>false</c>.
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117 /// </returns>
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118 public static bool IsToday(this DateTime dt)
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119 {
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120 return (dt.Date == DateTime.Today);
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121 }
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122
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123 /// <summary>
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124 /// Sets the time on the specified DateTime value.
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125 /// </summary>
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126 /// <param name="date">The base date.</param>
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127 /// <param name="hours">The hours to be set.</param>
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128 /// <param name="minutes">The minutes to be set.</param>
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129 /// <param name="seconds">The seconds to be set.</param>
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130 /// <returns>The DateTime including the new time value</returns>
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131 public static DateTime SetTime(this DateTime date, int hours, int minutes, int seconds)
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132 {
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133 return date.SetTime(new TimeSpan(hours, minutes, seconds));
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134 }
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135
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136 /// <summary>
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137 /// Sets the time on the specified DateTime value.
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138 /// </summary>
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139 /// <param name="date">The base date.</param>
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140 /// <param name="time">The TimeSpan to be applied.</param>
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141 /// <returns>
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142 /// The DateTime including the new time value
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143 /// </returns>
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144 public static DateTime SetTime(this DateTime date, TimeSpan time)
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145 {
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146 return date.Date.Add(time);
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147 }
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148
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149 /// <summary>
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150 /// Converts a DateTime into a DateTimeOffset using the local system time zone.
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151 /// </summary>
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152 /// <param name="localDateTime">The local DateTime.</param>
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153 /// <returns>The converted DateTimeOffset</returns>
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154 public static DateTimeOffset ToDateTimeOffset(this DateTime localDateTime)
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155 {
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156 return localDateTime.ToDateTimeOffset(null);
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157 }
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158
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159 /// <summary>
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160 /// Converts a DateTime into a DateTimeOffset using the specified time zone.
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161 /// </summary>
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162 /// <param name="localDateTime">The local DateTime.</param>
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163 /// <param name="localTimeZone">The local time zone.</param>
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164 /// <returns>The converted DateTimeOffset</returns>
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165 public static DateTimeOffset ToDateTimeOffset(this DateTime localDateTime, TimeZoneInfo localTimeZone)
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166 {
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167 localTimeZone = (localTimeZone ?? TimeZoneInfo.Local);
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168
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169 if (localDateTime.Kind != DateTimeKind.Unspecified)
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170 {
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171 localDateTime = new DateTime(localDateTime.Ticks, DateTimeKind.Unspecified);
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172 }
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173
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174 return TimeZoneInfo.ConvertTimeToUtc(localDateTime, localTimeZone);
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175 }
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176
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177 /// <summary>
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178 /// Gets the first day of the week using the current culture.
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179 /// </summary>
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180 /// <param name="date">The date.</param>
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181 /// <returns>The first day of the week</returns>
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182 public static DateTime GetFirstDayOfWeek(this DateTime date)
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183 {
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184 return date.GetFirstDayOfWeek(null);
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185 }
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186
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187 /// <summary>
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188 /// Gets the first day of the week using the specified culture.
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189 /// </summary>
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190 /// <param name="date">The date.</param>
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191 /// <param name="cultureInfo">The culture to determine the first weekday of a week.</param>
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192 /// <returns>The first day of the week</returns>
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193 public static DateTime GetFirstDayOfWeek(this DateTime date, CultureInfo cultureInfo)
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194 {
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195 cultureInfo = (cultureInfo ?? CultureInfo.CurrentCulture);
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196
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197 var firstDayOfWeek = cultureInfo.DateTimeFormat.FirstDayOfWeek;
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198
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199 while (date.DayOfWeek != firstDayOfWeek)
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200 {
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201 date = date.AddDays(-1);
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202 }
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203
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204 return date;
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205 }
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206
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207 /// <summary>
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208 /// Gets the last day of the week using the current culture.
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209 /// </summary>
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210 /// <param name="date">The date.</param>
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211 /// <returns>The first day of the week</returns>
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212 public static DateTime GetLastDayOfWeek(this DateTime date)
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213 {
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214 return date.GetLastDayOfWeek(null);
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215 }
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216
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217 /// <summary>
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218 /// Gets the last day of the week using the specified culture.
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219 /// </summary>
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220 /// <param name="date">The date.</param>
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221 /// <param name="cultureInfo">The culture to determine the first weekday of a week.</param>
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222 /// <returns>The first day of the week</returns>
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223 public static DateTime GetLastDayOfWeek(this DateTime date, CultureInfo cultureInfo)
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224 {
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225 return date.GetFirstDayOfWeek(cultureInfo).AddDays(6);
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226 }
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227
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228 /// <summary>
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229 /// Gets the next occurence of the specified weekday within the current week using the current culture.
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230 /// </summary>
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231 /// <param name="date">The base date.</param>
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232 /// <param name="weekday">The desired weekday.</param>
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233 /// <returns>The calculated date.</returns>
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234 /// <example><code>
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235 /// var thisWeeksMonday = DateTime.Now.GetWeekday(DayOfWeek.Monday);
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236 /// </code></example>
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237 public static DateTime GetWeeksWeekday(this DateTime date, DayOfWeek weekday)
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238 {
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239 return date.GetWeeksWeekday(weekday, null);
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240 }
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241
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242 /// <summary>
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243 /// Gets the next occurence of the specified weekday within the current week using the specified culture.
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244 /// </summary>
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245 /// <param name="date">The base date.</param>
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246 /// <param name="weekday">The desired weekday.</param>
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247 /// <param name="cultureInfo">The culture to determine the first weekday of a week.</param>
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248 /// <returns>The calculated date.</returns>
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249 /// <example><code>
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250 /// var thisWeeksMonday = DateTime.Now.GetWeekday(DayOfWeek.Monday);
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251 /// </code></example>
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252 public static DateTime GetWeeksWeekday(this DateTime date, DayOfWeek weekday, CultureInfo cultureInfo)
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253 {
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254 var firstDayOfWeek = date.GetFirstDayOfWeek(cultureInfo);
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255
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256 return firstDayOfWeek.GetNextWeekday(weekday);
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257 }
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258
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259 /// <summary>
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260 /// Gets the next occurence of the specified weekday.
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261 /// </summary>
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262 /// <param name="date">The base date.</param>
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263 /// <param name="weekday">The desired weekday.</param>
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264 /// <returns>The calculated date.</returns>
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265 /// <example><code>
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266 /// var lastMonday = DateTime.Now.GetNextWeekday(DayOfWeek.Monday);
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267 /// </code></example>
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268 public static DateTime GetNextWeekday(this DateTime date, DayOfWeek weekday)
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269 {
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270 while (date.DayOfWeek != weekday)
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271 {
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272 date = date.AddDays(1);
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273 }
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274
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275 return date;
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276 }
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277
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278 /// <summary>
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279 /// Gets the previous occurence of the specified weekday.
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280 /// </summary>
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281 /// <param name="date">The base date.</param>
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282 /// <param name="weekday">The desired weekday.</param>
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283 /// <returns>The calculated date.</returns>
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284 /// <example><code>
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285 /// var lastMonday = DateTime.Now.GetPreviousWeekday(DayOfWeek.Monday);
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286 /// </code></example>
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287 public static DateTime GetPreviousWeekday(this DateTime date, DayOfWeek weekday)
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288 {
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289 while (date.DayOfWeek != weekday)
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290 {
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291 date = date.AddDays(-1);
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292 }
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293
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294 return date;
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295 }
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296
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297 #endregion
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298 }
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299 }