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1<noscript><link rel="stylesheet" href="../../static.files/noscript-9f56287d.css"></noscript><link rel="icon" href="https://cloudcdn.pro/dtt/v1/favicon.ico"></head><body class="rustdoc src"><a class="skip-main-content" href="#main-content">Skip to main content</a><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><section id="main-content" class="content" tabindex="-1"><div class="main-heading"><h1><div class="sub-heading">dtt/</div>lib.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap digits-3"><pre class="rust"><code><a href=#1 id=1 data-nosnippet>1</a><span class="attr">#![forbid(unsafe_code)] 2<a href=#2 id=2 data-nosnippet>2</a></span><span class="comment">// Copyright © 2025 DateTime (DTT) library. All rights reserved. 3<a href=#3 id=3 data-nosnippet>3</a>// SPDX-License-Identifier: Apache-2.0 OR MIT 4<a href=#4 id=4 data-nosnippet>4</a> 5<a href=#5 id=5 data-nosnippet>5</a></span><span class="doccomment">//! `DateTime` (DTT) is a comprehensive library for date and time manipulation. 6<a href=#6 id=6 data-nosnippet>6</a>//! 7<a href=#7 id=7 data-nosnippet>7</a>//! # Overview 8<a href=#8 id=8 data-nosnippet>8</a>//! 9<a href=#9 id=9 data-nosnippet>9</a>//! This crate provides robust tools for handling dates, times, and timezones in Rust, 10<a href=#10 id=10 data-nosnippet>10</a>//! with a focus on correctness, ergonomics, and performance. 11<a href=#11 id=11 data-nosnippet>11</a>//! 12<a href=#12 id=12 data-nosnippet>12</a>//! # Features 13<a href=#13 id=13 data-nosnippet>13</a>//! 14<a href=#14 id=14 data-nosnippet>14</a>//! - Create and parse dates in multiple formats 15<a href=#15 id=15 data-nosnippet>15</a>//! - Timezone conversions and handling 16<a href=#16 id=16 data-nosnippet>16</a>//! - Date and time arithmetic 17<a href=#17 id=17 data-nosnippet>17</a>//! - Formatting and serialization 18<a href=#18 id=18 data-nosnippet>18</a>//! 19<a href=#19 id=19 data-nosnippet>19</a>//! # Error Handling 20<a href=#20 id=20 data-nosnippet>20</a>//! 21<a href=#21 id=21 data-nosnippet>21</a>//! This crate uses the `thiserror` crate for error handling. All errors are 22<a href=#22 id=22 data-nosnippet>22</a>//! properly typed and implement standard error traits. Operations that may fail 23<a href=#23 id=23 data-nosnippet>23</a>//! return `Result<T, AppError>`. 24<a href=#24 id=24 data-nosnippet>24</a>//! 25<a href=#25 id=25 data-nosnippet>25</a>//! # Examples 26<a href=#26 id=26 data-nosnippet>26</a>//! 27<a href=#27 id=27 data-nosnippet>27</a>//! ```rust 28<a href=#28 id=28 data-nosnippet>28</a>//! use dtt::DateTime; 29<a href=#29 id=29 data-nosnippet>29</a>//! 30<a href=#30 id=30 data-nosnippet>30</a>//! let now = DateTime::new(); 31<a href=#31 id=31 data-nosnippet>31</a>//! println!("Current time: {}", now); 32<a href=#32 id=32 data-nosnippet>32</a>//! ``` 33<a href=#33 id=33 data-nosnippet>33</a> 34<a href=#34 id=34 data-nosnippet>34</a></span><span class="attr">#![doc = <span class="macro">include_str!</span>(<span class="string">"../README.md"</span>)] 35<a href=#35 id=35 data-nosnippet>35</a>#![doc( 36<a href=#36 id=36 data-nosnippet>36</a> html_favicon_url = <span class="string">"https://cloudcdn.pro/dtt/v1/favicon.ico"</span>, 37<a href=#37 id=37 data-nosnippet>37</a> html_logo_url = <span class="string">"https://cloudcdn.pro/dtt/v1/logos/dtt.svg"</span>, 38<a href=#38 id=38 data-nosnippet>38</a> html_root_url = <span class="string">"https://docs.rs/dtt" 39<a href=#39 id=39 data-nosnippet>39</a></span>)] 40<a href=#40 id=40 data-nosnippet>40</a></span><span class="comment">// Rust-level lints live in [lints.rust] in Cargo.toml. Universal clippy 41<a href=#41 id=41 data-nosnippet>41</a>// allowances live in [lints.clippy]. The strict deny-list below applies 42<a href=#42 id=42 data-nosnippet>42</a>// to the *library crate only* â integration tests, benches, and examples 43<a href=#43 id=43 data-nosnippet>43</a>// are separate crates and remain free to use `unwrap`, `expect`, etc. 44<a href=#44 id=44 data-nosnippet>44</a></span><span class="attr">#![deny( 45<a href=#45 id=45 data-nosnippet>45</a> rustdoc::broken_intra_doc_links, 46<a href=#46 id=46 data-nosnippet>46</a> clippy::pedantic, 47<a href=#47 id=47 data-nosnippet>47</a> clippy::nursery, 48<a href=#48 id=48 data-nosnippet>48</a> clippy::cargo, 49<a href=#49 id=49 data-nosnippet>49</a> clippy::unwrap_used, 50<a href=#50 id=50 data-nosnippet>50</a> clippy::expect_used, 51<a href=#51 id=51 data-nosnippet>51</a> clippy::panic, 52<a href=#52 id=52 data-nosnippet>52</a> clippy::result_unit_err, 53<a href=#53 id=53 data-nosnippet>53</a> clippy::clone_on_ref_ptr 54<a href=#54 id=54 data-nosnippet>54</a>)] 55<a href=#55 id=55 data-nosnippet>55</a>#![cfg_attr(docsrs, feature(doc_cfg))]
56<a href=#56 id=56 data-nosnippet>56</a> 57<a href=#57 id=57 data-nosnippet>57</a></span><span class="comment">// Standard library imports 58<a href=#58 id=58 data-nosnippet>58</a></span><span class="kw">use </span>std::env; 59<a href=#59 id=59 data-nosnippet>59</a> 60<a href=#60 id=60 data-nosnippet>60</a><span class="doccomment">/// Library constants and configuration values 61<a href=#61 id=61 data-nosnippet>61</a></span><span class="kw">pub mod </span>constants { 62<a href=#62 id=62 data-nosnippet>62</a> <span class="doccomment">/// Current version of the library from Cargo.toml 63<a href=#63 id=63 data-nosnippet>63</a> </span><span class="kw">pub const </span>VERSION: <span class="kw-2">&</span>str = <span class="macro">env!</span>(<span class="string">"CARGO_PKG_VERSION"</span>); 64<a href=#64 id=64 data-nosnippet>64</a> 65<a href=#65 id=65 data-nosnippet>65</a> <span class="doccomment">/// Environment variable controlling test mode 66<a href=#66 id=66 data-nosnippet>66</a> </span><span class="kw">pub const </span>TEST_MODE_ENV: <span class="kw-2">&</span>str = <span class="string">"DTT_TEST_MODE"</span>; 67<a href=#67 id=67 data-nosnippet>67</a> 68<a href=#68 id=68 data-nosnippet>68</a> <span class="doccomment">/// Value indicating test mode is enabled 69<a href=#69 id=69 data-nosnippet>69</a> </span><span class="kw">pub const </span>TEST_MODE_ENABLED: <span class="kw-2">&</span>str = <span class="string">"1"</span>; 70<a href=#70 id=70 data-nosnippet>70</a> 71<a href=#71 id=71 data-nosnippet>71</a> <span class="doccomment">/// Welcome message displayed during initialization 72<a href=#72 id=72 data-nosnippet>72</a> </span><span class="kw">pub const </span>WELCOME_MSG: <span class="kw-2">&</span>str = <span class="string">"Welcome to `DTT` ð!"</span>; 73<a href=#73 id=73 data-nosnippet>73</a> 74<a href=#74 id=74 data-nosnippet>74</a> <span class="doccomment">/// Library description displayed during initialization 75<a href=#75 id=75 data-nosnippet>75</a> </span><span class="kw">pub const </span>DESCRIPTION: <span class="kw-2">&</span>str = <span class="string">"A Rust library for parsing, validating,manipulating, and formatting dates and times."</span>; 76<a href=#76 id=76 data-nosnippet>76</a>} 77<a href=#77 id=77 data-nosnippet>77</a> 78<a href=#78 id=78 data-nosnippet>78</a><span class="comment">// Re-exports with inline documentation 79<a href=#79 id=79 data-nosnippet>79</a></span><span class="attr">#[doc(inline)] 80<a href=#80 id=80 data-nosnippet>80</a></span><span class="kw">pub use </span><span class="kw">crate</span>::datetime::DateTime; 81<a href=#81 id=81 data-nosnippet>81</a><span class="attr">#[doc(inline)] 82<a href=#82 id=82 data-nosnippet>82</a></span><span class="kw">pub use </span><span class="kw">crate</span>::error::AppError; 83<a href=#83 id=83 data-nosnippet>83</a> 84<a href=#84 id=84 data-nosnippet>84</a><span class="doccomment">/// Core datetime functionality and operations. 85<a href=#85 id=85 data-nosnippet>85</a>/// 86<a href=#86 id=86 data-nosnippet>86</a>/// This module contains the primary `DateTime` type and associated functionality 87<a href=#87 id=87 data-nosnippet>87</a>/// for date and time manipulation. 88<a href=#88 id=88 data-nosnippet>88</a></span><span class="kw">pub mod </span>datetime; 89<a href=#89 id=89 data-nosnippet>89</a> 90<a href=#90 id=90 data-nosnippet>90</a><span class="doccomment">/// Error handling types and implementations. 91<a href=#91 id=91 data-nosnippet>91</a>/// 92<a href=#92 id=92 data-nosnippet>92</a>/// Provides custom error types for handling various error conditions that may 93<a href=#93 id=93 data-nosnippet>93</a>/// occur during datetime operations. 94<a href=#94 id=94 data-nosnippet>94</a></span><span class="kw">pub mod </span>error; 95<a href=#95 id=95 data-nosnippet>95</a> 96<a href=#96 id=96 data-nosnippet>96</a><span class="doccomment">/// Macro definitions for common operations. 97<a href=#97 id=97 data-nosnippet>97</a>/// 98<a href=#98 id=98 data-nosnippet>98</a>/// Contains utility macros to simplify common datetime operations and reduce 99<a href=#99 id=99 data-nosnippet>99</a>/// boilerplate code. 100<a href=#100 id=100 data-nosnippet>100</a></span><span class="kw">pub mod </span>macros; 101<a href=#101 id=101 data-nosnippet>101</a> 102<a href=#102 id=102 data-nosnippet>102</a><span class="doccomment">/// Commonly used types and traits. 103<a href=#103 id=103 data-nosnippet>103</a>/// 104<a href=#104 id=104 data-nosnippet>104</a>/// Provides a convenient way to import commonly used types with a single use statement. 105<a href=#105 id=105 data-nosnippet>105</a></span><span class="kw">pub mod </span>prelude { 106<a href=#106 id=106 data-nosnippet>106</a> <span class="kw">pub use </span><span class="kw">crate</span>::datetime::{DateTime, DateTimeBuilder}; 107<a href=#107 id=107 data-nosnippet>107</a> <span class="kw">pub use </span><span class="kw">crate</span>::error::{AppError, DateTimeError}; 108<a href=#108 id=108 data-nosnippet>108</a>} 109<a href=#109 id=109 data-nosnippet>109</a> 110<a href=#110 id=110 data-nosnippet>110</a><span class="doccomment">/// Runs the main library functionality with proper error handling. 111<a href=#111 id=111 data-nosnippet>111</a>/// 112<a href=#112 id=112 data-nosnippet>112</a>/// This function initializes the library and performs basic setup operations. 113<a href=#113 id=113 data-nosnippet>113</a>/// It checks for test mode and returns appropriate results based on the 114<a href=#114 id=114 data-nosnippet>114</a>
114/// environment configuration. 115<a href=#115 id=115 data-nosnippet>115</a>/// 116<a href=#116 id=116 data-nosnippet>116</a>/// # Errors 117<a href=#117 id=117 data-nosnippet>117</a>/// 118<a href=#118 id=118 data-nosnippet>118</a>/// Returns `AppError::SimulatedError` in the following cases: 119<a href=#119 id=119 data-nosnippet>119</a>/// - When the `DTT_TEST_MODE` environment variable is set to "1" 120<a href=#120 id=120 data-nosnippet>120</a>/// - When environment variable access fails 121<a href=#121 id=121 data-nosnippet>121</a>/// 122<a href=#122 id=122 data-nosnippet>122</a>/// # Examples 123<a href=#123 id=123 data-nosnippet>123</a>/// 124<a href=#124 id=124 data-nosnippet>124</a>/// ```rust 125<a href=#125 id=125 data-nosnippet>125</a>/// use dtt::prelude::*; 126<a href=#126 id=126 data-nosnippet>126</a>/// 127<a href=#127 id=127 data-nosnippet>127</a>/// fn main() -> Result<(), AppError> { 128<a href=#128 id=128 data-nosnippet>128</a>/// match dtt::run() { 129<a href=#129 id=129 data-nosnippet>129</a>/// Ok(()) => println!("Library initialized successfully"), 130<a href=#130 id=130 data-nosnippet>130</a>/// Err(e) => eprintln!("Error during initialization: {}", e), 131<a href=#131 id=131 data-nosnippet>131</a>/// } 132<a href=#132 id=132 data-nosnippet>132</a>/// Ok(()) 133<a href=#133 id=133 data-nosnippet>133</a>/// } 134<a href=#134 id=134 data-nosnippet>134</a>/// ``` 135<a href=#135 id=135 data-nosnippet>135</a></span><span class="kw">pub fn </span>run() -> <span class="prelude-ty">Result</span><(), AppError> { 136<a href=#136 id=136 data-nosnippet>136</a> <span class="kw">if </span>is_test_mode() { 137<a href=#137 id=137 data-nosnippet>137</a> <span class="kw">return </span><span class="prelude-val">Err</span>(AppError::SimulatedError); 138<a href=#138 id=138 data-nosnippet>138</a> } 139<a href=#139 id=139 data-nosnippet>139</a> 140<a href=#140 id=140 data-nosnippet>140</a> display_welcome_message(); 141<a href=#141 id=141 data-nosnippet>141</a> <span class="prelude-val">Ok</span>(()) 142<a href=#142 id=142 data-nosnippet>142</a>} 143<a href=#143 id=143 data-nosnippet>143</a> 144<a href=#144 id=144 data-nosnippet>144</a><span class="doccomment">/// Checks if the library is running in test mode. 145<a href=#145 id=145 data-nosnippet>145</a>/// 146<a href=#146 id=146 data-nosnippet>146</a>/// Examines the environment variable `DTT_TEST_MODE` to determine if the library
147<a href=#147 id=147 data-nosnippet>147</a>/// should operate in test mode. 148<a href=#148 id=148 data-nosnippet>148</a></span><span class="kw">fn </span>is_test_mode() -> bool { 149<a href=#149 id=149 data-nosnippet>149</a> env::var(constants::TEST_MODE_ENV) 150<a href=#150 id=150 data-nosnippet>150</a> .is_ok_and(|val| val == constants::TEST_MODE_ENABLED) 151<a href=#151 id=151 data-nosnippet>151</a>} 152<a href=#152 id=152 data-nosnippet>152</a> 153<a href=#153 id=153 data-nosnippet>153</a><span class="doccomment">/// Displays the welcome message with library information. 154<a href=#154 id=154 data-nosnippet>154</a>/// 155<a href=#155 id=155 data-nosnippet>155</a>/// Prints a welcome message along with the library description and current version. 156<a href=#156 id=156 data-nosnippet>156</a></span><span class="kw">fn </span>display_welcome_message() { 157<a href=#157 id=157 data-nosnippet>157</a> <span class="macro">println!</span>(<span class="string">"{}"</span>, constants::WELCOME_MSG); 158<a href=#158 id=158 data-nosnippet>158</a> <span class="macro">println!</span>(<span class="string">"{}"</span>, constants::DESCRIPTION); 159<a href=#159 id=159 data-nosnippet>159</a> <span class="macro">println!</span>(<span class="string">"Version: {}"</span>, constants::VERSION); 160<a href=#160 id=160 data-nosnippet>160</a>} 161<a href=#161 id=161 data-nosnippet>161</a> 162<a href=#162 id=162 data-nosnippet>162</a><span class="attr">#[cfg(test)] 163<a href=#163 id=163 data-nosnippet>163</a></span><span class="kw">mod </span>tests { 164<a href=#164 id=164 data-nosnippet>164</a> <span class="kw">use super</span>::<span class="kw-2">*</span>; 165<a href=#165 id=165 data-nosnippet>165</a> 166<a href=#166 id=166 data-nosnippet>166</a> <span class="kw">mod </span>initialization { 167<a href=#167 id=167 data-nosnippet>167</a> <span class="kw">use super</span>::<span class="kw-2">*</span>; 168<a href=#168 id=168 data-nosnippet>168</a> <span class="kw">use </span>serial_test::serial; 169<a href=#169 id=169 data-nosnippet>169</a> 170<a href=#170 id=170 data-nosnippet>170</a> <span class="attr">#[test] 171<a href=#171 id=171 data-nosnippet>171</a> #[serial] 172<a href=#172 id=172 data-nosnippet>172</a> </span><span class="kw">fn </span>test_normal_run() { 173<a href=#173 id=173 data-nosnippet>173</a> env::remove_var(constants::TEST_MODE_ENV); 174<a href=#174 id=174 data-nosnippet>174</a> <span class="macro">assert!</span>(run().is_ok()); 175<a href=#175 id=175 data-nosnippet>175</a> } 176<a href=#176 id=176 data-nosnippet>176</a> 177<a href=#177 id=177 data-nosnippet>177</a> <span class="attr">#[test] 178<a href=#178 id=178 data-nosnippet>178</a> #[serial] 179<a href=#179 id=179 data-nosnippet>179</a> </span><span class="kw">fn </span>test_simulated_error() { 180<a href=#180 id=180 data-nosnippet>180</a> env::set_var( 181<a href=#181 id=181 data-nosnippet>181</a> constants::TEST_MODE_ENV, 182<a href=#182 id=182 data-nosnippet>182</a> constants::TEST_MODE_ENABLED, 183<a href=#183 id=183 data-nosnippet>183</a> ); 184<a href=#184 id=184 data-nosnippet>184</a> <span class="macro">assert!</span>(<span class="macro">matches!</span>(run(), <span class="prelude-val">Err</span>(AppError::SimulatedError))); 185<a href=#185 id=185 data-nosnippet>185</a> env::remove_var(constants::TEST_MODE_ENV); 186<a href=#186 id=186 data-nosnippet>186</a> } 187<a href=#187 id=187 data-nosnippet>187</a> } 188<a href=#188 id=188 data-nosnippet>188</a> 189<a href=#189 id=189 data-nosnippet>189</a> <span class="kw">mod </span>configuration { 190<a href=#190 id=190 data-nosnippet>190</a> <span class="kw">use super</span>::<span class="kw-2">*</span>; 191<a href=#191 id=191 data-nosnippet>191</a> <span class="kw">use </span>serial_test::serial; 192<a href=#192 id=192 data-nosnippet>192</a> 193<a href=#193 id=193 data-nosnippet>193</a> <span class="attr">#[test] 194<a href=#194 id=194 data-nosnippet>194</a> #[allow(clippy::const_is_empty)] 195<a href=#195 id=195 data-nosnippet>195</a> </span><span class="kw">fn </span>test_version_constant() { 196<a href=#196 id=196 data-nosnippet>196</a>
196 <span class="macro">assert!</span>( 197<a href=#197 id=197 data-nosnippet>197</a> !constants::VERSION.is_empty(), 198<a href=#198 id=198 data-nosnippet>198</a> <span class="string">"Version string should not be empty" 199<a href=#199 id=199 data-nosnippet>199</a> </span>); 200<a href=#200 id=200 data-nosnippet>200</a> } 201<a href=#201 id=201 data-nosnippet>201</a> 202<a href=#202 id=202 data-nosnippet>202</a> <span class="attr">#[test] 203<a href=#203 id=203 data-nosnippet>203</a> #[serial] 204<a href=#204 id=204 data-nosnippet>204</a> </span><span class="kw">fn </span>test_is_test_mode() { 205<a href=#205 id=205 data-nosnippet>205</a> env::remove_var(constants::TEST_MODE_ENV); 206<a href=#206 id=206 data-nosnippet>206</a> <span class="kw">let </span>first_check = is_test_mode(); 207<a href=#207 id=207 data-nosnippet>207</a> <span class="macro">assert!</span>( 208<a href=#208 id=208 data-nosnippet>208</a> !first_check, 209<a href=#209 id=209 data-nosnippet>209</a> <span class="string">"Should not be in test mode by default" 210<a href=#210 id=210 data-nosnippet>210</a> </span>); 211<a href=#211 id=211 data-nosnippet>211</a> 212<a href=#212 id=212 data-nosnippet>212</a> env::set_var( 213<a href=#213 id=213 data-nosnippet>213</a> constants::TEST_MODE_ENV, 214<a href=#214 id=214 data-nosnippet>214</a> constants::TEST_MODE_ENABLED, 215<a href=#215 id=215 data-nosnippet>215</a> ); 216<a href=#216 id=216 data-nosnippet>216</a> <span class="kw">let </span>second_check = is_test_mode(); 217<a href=#217 id=217 data-nosnippet>217</a> <span class="macro">assert!</span>( 218<a href=#218 id=218 data-nosnippet>218</a> second_check, 219<a href=#219 id=219 data-nosnippet>219</a> <span class="string">"Should be in test mode after enabling it" 220<a href=#220 id=220 data-nosnippet>220</a> </span>); 221<a href=#221 id=221 data-nosnippet>221</a> env::remove_var(constants::TEST_MODE_ENV); 222<a href=#222 id=222 data-nosnippet>222</a> } 223<a href=#223 id=223 data-nosnippet>223</a> } 224<a href=#224 id=224 data-nosnippet>224</a>} 225</code></pre></div></section></main>
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