doc/simple-date.html

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 230 <div id="content">
 231 <header>
 232 <h1 class="title">Simple-Date</h1>
 233 </header><nav id="table-of-contents">
 234 <h2>Table of Contents</h2>
 235 <div id="text-table-of-contents">
 236 <ul>
 237 <li><a href="#orgc96db35">Date type</a>
 238 <ul>
 239 <li><a href="#org4757ac7">class date</a></li>
 240 <li><a href="#orgbecb912">function encode-date (year month day)</a></li>
 241 <li><a href="#org17bca57">function decode-date (date)</a></li>
 242 <li><a href="#org9596f23">function day-of-week (date)</a></li>
 243 <li><a href="#org351e3fc">Timestamp type</a></li>
 244 <li><a href="#org9b35463">function encode-timestamp (year month day &amp;optional (hour 0) (minute 0) (second 0) (millisecond 0))</a></li>
 245 <li><a href="#org88dc827">function decode-timestamp (timestamp)</a></li>
 246 <li><a href="#org00b9c9c">function timestamp-to-universal-time (timestamp)</a></li>
 247 <li><a href="#orgf3fb124">function universal-time-to-timestamp (universal-time)</a></li>
 248 <li><a href="#org9841ce8">Interval type</a></li>
 249 <li><a href="#orgae89286">function encode-interval (&amp;key (year 0) (month 0) (week 0) (day 0) (hour 0) (minute 0) (second 0) (millisecond 0))</a></li>
 250 <li><a href="#org491ae2f">function decode-interval (interval)</a></li>
 251 </ul>
 252 </li>
 253 <li><a href="#orge311352">Operations</a>
 254 <ul>
 255 <li><a href="#orgff3d514">method time-add (a b)</a></li>
 256 <li><a href="#org6815ed9">method time-subtract (a b)</a></li>
 257 <li><a href="#orgd7aaac8">method time= (a b)</a></li>
 258 <li><a href="#orge502f5e">method time&lt; (a b)</a></li>
 259 <li><a href="#org7fb03e5">method time&gt; (a b)</a></li>
 260 <li><a href="#orgdc2b19c">function time&lt;= (a b)</a></li>
 261 <li><a href="#org7dd8012">function time&gt;= (a b)</a></li>
 262 </ul>
 263 </li>
 264 </ul>
 265 </div>
 266 </nav>
 267 <p>
 268 Simple-date provides types (CLOS classes) for dates, timestamps, and intervals
 269 similar to the ones SQL databases use, in order to be able to store and read
 270 these to and from a database in a straighforward way. A few obvious operations
 271 are defined on these types.
 272 </p>
 273
 274 <p>
 275 To use this library with cl-postgres or postmodern and get the simple-date reader
 276 to be loaded, you need to load simple-date/postgres-glue
 277 and then set the readtable. This will register suitable SQL
 278 readers and writers for the associated database types.
 279 </p>
 280
 281 <div class="org-src-container">
 282 <pre class="src src-lisp">(ql:quickload <span style="color: #98fb98; font-weight: bold;">:simple-date/postgres-glue</span>)
 283
 284 (setf cl-postgres:*sql-readtable*
 285         (cl-postgres:copy-sql-readtable
 286          simple-date-cl-postgres-glue:*simple-date-sql-readtable*))
 287 </pre>
 288 </div>
 289
 290 <p>
 291 The most glaring defect of this library is its ignorance of time zones. It
 292 pretends the whole world lives in UTC. Use with care.
 293 </p>
 294
 295 <p>
 296 To get back to the default cl-postgres reader:
 297 </p>
 298 <div class="org-src-container">
 299 <pre class="src src-lisp">(setf cl-postgres:*sql-readtable*
 300         (cl-postgres:copy-sql-readtable
 301          cl-postgres::*default-sql-readtable*))
 302 </pre>
 303 </div>
 304
 305 <p>
 306 To use the simple-date reader when cl-postgres is using the default:
 307 </p>
 308 <div class="org-src-container">
 309 <pre class="src src-lisp">(setf cl-postgres:*sql-readtable*
 310         (cl-postgres:copy-sql-readtable
 311          simple-date-cl-postgres-glue:*simple-date-sql-readtable*))
 312 </pre>
 313 </div>
 314
 315 <p>
 316 As a reminder for those who want to use local-time, to enable the local-time
 317 reader:
 318 </p>
 319 <div class="org-src-container">
 320 <pre class="src src-lisp">(local-time:set-local-time-cl-postgres-readers)
 321 </pre>
 322 </div>
 323
 324
 325 <div id="outline-container-orgc96db35" class="outline-2">
 326 <h2 id="orgc96db35"><a id="ID-6cefa703-d55b-464d-bad9-7c7ceae0c90d"></a>Date type</h2>
 327 <div class="outline-text-2" id="text-orgc96db35">
 328 </div>
 329 <div id="outline-container-org4757ac7" class="outline-3">
 330 <h3 id="org4757ac7"><a id="ID-203d5d98-5ce7-4bcb-81d9-1aeb4fe2796d"></a>class date</h3>
 331 <div class="outline-text-3" id="text-org4757ac7">
 332 <p>
 333 Represents a date, with no time-of-day information.
 334 </p>
 335 </div>
 336 </div>
 337
 338 <div id="outline-container-orgbecb912" class="outline-3">
 339 <h3 id="orgbecb912"><a id="ID-dbf2a874-80e1-4a43-86be-7febb1573b8d"></a>function encode-date (year month day)</h3>
 340 <div class="outline-text-3" id="text-orgbecb912">
 341 <p>
 342 → date
 343 </p>
 344
 345 <p>
 346 Creates a date object.
 347 </p>
 348 </div>
 349 </div>
 350
 351 <div id="outline-container-org17bca57" class="outline-3">
 352 <h3 id="org17bca57"><a id="ID-35da4a62-ea64-4053-aa30-4496d56a0f95"></a>function decode-date (date)</h3>
 353 <div class="outline-text-3" id="text-org17bca57">
 354 <p>
 355 → (values year month day)
 356 </p>
 357
 358 <p>
 359 Extract the elements from a date object.
 360 </p>
 361 </div>
 362 </div>
 363
 364 <div id="outline-container-org9596f23" class="outline-3">
 365 <h3 id="org9596f23"><a id="ID-b1590639-fd02-458d-86e4-6e1bd3c1c003"></a>function day-of-week (date)</h3>
 366 <div class="outline-text-3" id="text-org9596f23">
 367 <p>
 368 → integer
 369 </p>
 370
 371 <p>
 372 Determine the day of the week that the given date falls on. Value ranges from
 373 0 to 6, with 0 being Sunday and 6 being Saturday.
 374 </p>
 375 </div>
 376 </div>
 377
 378 <div id="outline-container-org351e3fc" class="outline-3">
 379 <h3 id="org351e3fc"><a id="ID-6efdaace-0c1c-45ba-8376-9b91e18a0b38"></a>Timestamp type</h3>
 380 <div class="outline-text-3" id="text-org351e3fc">
 381 <p>
 382 class timestamp
 383 </p>
 384
 385 <p>
 386 Represents an absolute timestamp, with a millisecond precision.
 387 </p>
 388 </div>
 389 </div>
 390
 391 <div id="outline-container-org9b35463" class="outline-3">
 392 <h3 id="org9b35463"><a id="ID-f6817a2a-92e2-44aa-9060-d9ab459f6207"></a>function encode-timestamp (year month day &amp;optional (hour 0) (minute 0) (second 0) (millisecond 0))</h3>
 393 <div class="outline-text-3" id="text-org9b35463">
 394 <p>
 395 → timestamp
 396 </p>
 397
 398 <p>
 399 Create a timestamp. No negative values or values outside of an arguments normal
 400 range (i.e. 60 for minutes, 1000 for milliseconds) should be passed.
 401 </p>
 402 </div>
 403 </div>
 404
 405 <div id="outline-container-org88dc827" class="outline-3">
 406 <h3 id="org88dc827"><a id="ID-5cb5f677-4fc4-4ab3-b2af-65579e660baf"></a>function decode-timestamp (timestamp)</h3>
 407 <div class="outline-text-3" id="text-org88dc827">
 408 <p>
 409 → (values year month day hour minute second millisecond)
 410 </p>
 411
 412 <p>
 413 Decode a timestamp into its components.
 414 </p>
 415 </div>
 416 </div>
 417
 418 <div id="outline-container-org00b9c9c" class="outline-3">
 419 <h3 id="org00b9c9c"><a id="ID-477dd9e6-3e72-4eaa-b1fd-cf5d06bdfd1b"></a>function timestamp-to-universal-time (timestamp)</h3>
 420 <div class="outline-text-3" id="text-org00b9c9c">
 421 <p>
 422 → universal-time
 423 </p>
 424
 425 <p>
 426 Convert a timestamp to the corresponding universal-time, rounding to seconds.
 427 Note that this will treat the timestamp as if it were in UTC.
 428 </p>
 429 </div>
 430 </div>
 431
 432 <div id="outline-container-orgf3fb124" class="outline-3">
 433 <h3 id="orgf3fb124"><a id="ID-ba44156f-a860-4601-a5fe-6465d6ad8353"></a>function universal-time-to-timestamp (universal-time)</h3>
 434 <div class="outline-text-3" id="text-orgf3fb124">
 435 <p>
 436 → timestamp
 437 </p>
 438
 439 <p>
 440 Create a timestamp from a universal time. Again, the resulting timestamp should
 441 be treated as if it were in UTC.
 442 </p>
 443 </div>
 444 </div>
 445
 446 <div id="outline-container-org9841ce8" class="outline-3">
 447 <h3 id="org9841ce8"><a id="ID-316f3287-fd76-46ce-8c2b-c07ad381fc38"></a>Interval type</h3>
 448 <div class="outline-text-3" id="text-org9841ce8">
 449 <p>
 450 class interval
 451 </p>
 452
 453 <p>
 454 An interval represents a period of time. It contains both an absolute part in
 455 milliseconds (days, weeks, minutes, etc are always the same length), and a
 456 relative part for months and years ― the amount of time that a month or year
 457 represents is not always the same.
 458 </p>
 459 </div>
 460 </div>
 461
 462 <div id="outline-container-orgae89286" class="outline-3">
 463 <h3 id="orgae89286"><a id="ID-77212a01-b23f-40c7-aeec-fc93d4834f53"></a>function encode-interval (&amp;key (year 0) (month 0) (week 0) (day 0) (hour 0) (minute 0) (second 0) (millisecond 0))</h3>
 464 <div class="outline-text-3" id="text-orgae89286">
 465 <p>
 466 → interval
 467 </p>
 468
 469 <p>
 470 Create an interval. Arguments may be negative and of any size.
 471 </p>
 472 </div>
 473 </div>
 474
 475 <div id="outline-container-org491ae2f" class="outline-3">
 476 <h3 id="org491ae2f"><a id="ID-cfd906be-cc00-437e-b250-b7d294131aa0"></a>function decode-interval (interval)</h3>
 477 <div class="outline-text-3" id="text-org491ae2f">
 478 <p>
 479 → (values year month day hour minute second millisecond)
 480 </p>
 481
 482 <p>
 483 Decompose an interval into parts. Note that these may be different from the
 484 parameters that created it ― an interval of 3600 seconds is the same as one
 485 of 1 hour.
 486 </p>
 487 </div>
 488 </div>
 489 </div>
 490
 491 <div id="outline-container-orge311352" class="outline-2">
 492 <h2 id="orge311352"><a id="ID-d2616cd8-622b-464f-994e-e1f9d6309706"></a>Operations</h2>
 493 <div class="outline-text-2" id="text-orge311352">
 494 <p>
 495 To prevent a proliferation of different function names, generic functions
 496 are used for operations on time values. The semantics of these differ for
 497 the type of the operands.
 498 </p>
 499 </div>
 500
 501 <div id="outline-container-orgff3d514" class="outline-3">
 502 <h3 id="orgff3d514"><a id="ID-6846ba8b-a59f-475e-bc25-0c18e4fa5548"></a>method time-add (a b)</h3>
 503 <div class="outline-text-3" id="text-orgff3d514">
 504 <p>
 505 → value
 506 </p>
 507
 508 <p>
 509 Adds two time-related objects. Adding an interval to a date or timestamp
 510 will return a new date or timestamp, increased by the value of the interval.
 511 Adding two intervals returns a new interval with the sum of the two
 512 arguments. Integers can be used in place of intervals, and will be
 513 interpreted as an amount of milliseconds.
 514 </p>
 515 </div>
 516 </div>
 517
 518 <div id="outline-container-org6815ed9" class="outline-3">
 519 <h3 id="org6815ed9"><a id="ID-98dee89f-7178-4487-8d85-3036149f2def"></a>method time-subtract (a b)</h3>
 520 <div class="outline-text-3" id="text-org6815ed9">
 521 <p>
 522 → value
 523 </p>
 524
 525 <p>
 526 Subtracts time-related objects from each other. Subtracting two dates or
 527 timestamps results in an interval that represents the difference between
 528 them. Similarly, subtracting two intervals also gives their difference.
 529 </p>
 530 </div>
 531 </div>
 532
 533 <div id="outline-container-orgd7aaac8" class="outline-3">
 534 <h3 id="orgd7aaac8"><a id="ID-74acb8a0-5438-4a56-8d08-3316a7792108"></a>method time= (a b)</h3>
 535 <div class="outline-text-3" id="text-orgd7aaac8">
 536 <p>
 537 → boolean
 538 </p>
 539
 540 <p>
 541 Compare two time-related values, returns a boolean indicating whether
 542 they denote the same time or period.
 543 </p>
 544 </div>
 545 </div>
 546
 547 <div id="outline-container-orge502f5e" class="outline-3">
 548 <h3 id="orge502f5e"><a id="ID-02b06b96-bbd7-482a-aa3c-f9080f97c3fa"></a>method time&lt; (a b)</h3>
 549 <div class="outline-text-3" id="text-orge502f5e">
 550 <p>
 551 → boolean
 552 </p>
 553
 554 <p>
 555 Compare two time-related values, returns a boolean indicating whether the
 556 first is less than the second.
 557 </p>
 558 </div>
 559 </div>
 560
 561 <div id="outline-container-org7fb03e5" class="outline-3">
 562 <h3 id="org7fb03e5"><a id="ID-6901c062-4b1c-4cb1-a9f6-6935141d5fdd"></a>method time&gt; (a b)</h3>
 563 <div class="outline-text-3" id="text-org7fb03e5">
 564 <p>
 565 → boolean
 566 </p>
 567
 568 <p>
 569 Compare two time-related values, returns a boolean indicating whether the
 570 first is greater than the second.
 571 </p>
 572 </div>
 573 </div>
 574
 575 <div id="outline-container-orgdc2b19c" class="outline-3">
 576 <h3 id="orgdc2b19c"><a id="ID-450e4d9e-2f31-4278-817a-bb42eaf0ea04"></a>function time&lt;= (a b)</h3>
 577 <div class="outline-text-3" id="text-orgdc2b19c">
 578 <p>
 579 → boolean
 580 </p>
 581
 582 <p>
 583 The inverse of time&gt;.
 584 </p>
 585 </div>
 586 </div>
 587
 588 <div id="outline-container-org7dd8012" class="outline-3">
 589 <h3 id="org7dd8012"><a id="ID-d77174da-9511-41c6-bc46-95d62842435c"></a>function time&gt;= (a b)</h3>
 590 <div class="outline-text-3" id="text-org7dd8012">
 591 <p>
 592 → boolean
 593 </p>
 594
 595 <p>
 596 The inverse of time&lt;.
 597 </p>
 598 </div>
 599 </div>
 600 </div>
 601 </div>
 602 </body>
 603 </html>