date.out 21.6 KB
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--
-- DATE
--
CREATE TABLE DATE_TBL (f1 date);
INSERT INTO DATE_TBL VALUES ('1957-04-09');
INSERT INTO DATE_TBL VALUES ('1957-06-13');
INSERT INTO DATE_TBL VALUES ('1996-02-28');
INSERT INTO DATE_TBL VALUES ('1996-02-29');
INSERT INTO DATE_TBL VALUES ('1996-03-01');
INSERT INTO DATE_TBL VALUES ('1996-03-02');
INSERT INTO DATE_TBL VALUES ('1997-02-28');
INSERT INTO DATE_TBL VALUES ('1997-02-29');
13
ERROR:  date/time field value out of range: "1997-02-29"
14 15
LINE 1: INSERT INTO DATE_TBL VALUES ('1997-02-29');
                                     ^
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66
INSERT INTO DATE_TBL VALUES ('1997-03-01');
INSERT INTO DATE_TBL VALUES ('1997-03-02');
INSERT INTO DATE_TBL VALUES ('2000-04-01');
INSERT INTO DATE_TBL VALUES ('2000-04-02');
INSERT INTO DATE_TBL VALUES ('2000-04-03');
INSERT INTO DATE_TBL VALUES ('2038-04-08');
INSERT INTO DATE_TBL VALUES ('2039-04-09');
INSERT INTO DATE_TBL VALUES ('2040-04-10');
SELECT f1 AS "Fifteen" FROM DATE_TBL;
  Fifteen   
------------
 04-09-1957
 06-13-1957
 02-28-1996
 02-29-1996
 03-01-1996
 03-02-1996
 02-28-1997
 03-01-1997
 03-02-1997
 04-01-2000
 04-02-2000
 04-03-2000
 04-08-2038
 04-09-2039
 04-10-2040
(15 rows)

SELECT f1 AS "Nine" FROM DATE_TBL WHERE f1 < '2000-01-01';
    Nine    
------------
 04-09-1957
 06-13-1957
 02-28-1996
 02-29-1996
 03-01-1996
 03-02-1996
 02-28-1997
 03-01-1997
 03-02-1997
(9 rows)

SELECT f1 AS "Three" FROM DATE_TBL
  WHERE f1 BETWEEN '2000-01-01' AND '2001-01-01';
   Three    
------------
 04-01-2000
 04-02-2000
 04-03-2000
(3 rows)

67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91
--
-- Check all the documented input formats
--
SET datestyle TO iso;  -- display results in ISO
SET datestyle TO ymd;
SELECT date 'January 8, 1999';
    date    
------------
 1999-01-08
(1 row)

SELECT date '1999-01-08';
    date    
------------
 1999-01-08
(1 row)

SELECT date '1999-01-18';
    date    
------------
 1999-01-18
(1 row)

SELECT date '1/8/1999';
ERROR:  date/time field value out of range: "1/8/1999"
92 93
LINE 1: SELECT date '1/8/1999';
                    ^
94 95 96
HINT:  Perhaps you need a different "datestyle" setting.
SELECT date '1/18/1999';
ERROR:  date/time field value out of range: "1/18/1999"
97 98
LINE 1: SELECT date '1/18/1999';
                    ^
99 100 101
HINT:  Perhaps you need a different "datestyle" setting.
SELECT date '18/1/1999';
ERROR:  date/time field value out of range: "18/1/1999"
102 103
LINE 1: SELECT date '18/1/1999';
                    ^
104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136
HINT:  Perhaps you need a different "datestyle" setting.
SELECT date '01/02/03';
    date    
------------
 2001-02-03
(1 row)

SELECT date '19990108';
    date    
------------
 1999-01-08
(1 row)

SELECT date '990108';
    date    
------------
 1999-01-08
(1 row)

SELECT date '1999.008';
    date    
------------
 1999-01-08
(1 row)

SELECT date 'J2451187';
    date    
------------
 1999-01-08
(1 row)

SELECT date 'January 8, 99 BC';
ERROR:  date/time field value out of range: "January 8, 99 BC"
137 138
LINE 1: SELECT date 'January 8, 99 BC';
                    ^
139 140 141 142 143 144 145 146 147 148 149 150 151 152 153
HINT:  Perhaps you need a different "datestyle" setting.
SELECT date '99-Jan-08';
    date    
------------
 1999-01-08
(1 row)

SELECT date '1999-Jan-08';
    date    
------------
 1999-01-08
(1 row)

SELECT date '08-Jan-99';
ERROR:  date/time field value out of range: "08-Jan-99"
154 155
LINE 1: SELECT date '08-Jan-99';
                    ^
156 157 158 159 160 161 162 163 164
HINT:  Perhaps you need a different "datestyle" setting.
SELECT date '08-Jan-1999';
    date    
------------
 1999-01-08
(1 row)

SELECT date 'Jan-08-99';
ERROR:  date/time field value out of range: "Jan-08-99"
165 166
LINE 1: SELECT date 'Jan-08-99';
                    ^
167 168 169 170 171 172 173 174 175
HINT:  Perhaps you need a different "datestyle" setting.
SELECT date 'Jan-08-1999';
    date    
------------
 1999-01-08
(1 row)

SELECT date '99-08-Jan';
ERROR:  invalid input syntax for type date: "99-08-Jan"
176 177
LINE 1: SELECT date '99-08-Jan';
                    ^
178 179
SELECT date '1999-08-Jan';
ERROR:  invalid input syntax for type date: "1999-08-Jan"
180 181
LINE 1: SELECT date '1999-08-Jan';
                    ^
182 183 184 185 186 187 188 189 190 191 192 193 194 195
SELECT date '99 Jan 08';
    date    
------------
 1999-01-08
(1 row)

SELECT date '1999 Jan 08';
    date    
------------
 1999-01-08
(1 row)

SELECT date '08 Jan 99';
ERROR:  date/time field value out of range: "08 Jan 99"
196 197
LINE 1: SELECT date '08 Jan 99';
                    ^
198 199 200 201 202 203 204 205 206
HINT:  Perhaps you need a different "datestyle" setting.
SELECT date '08 Jan 1999';
    date    
------------
 1999-01-08
(1 row)

SELECT date 'Jan 08 99';
ERROR:  date/time field value out of range: "Jan 08 99"
207 208
LINE 1: SELECT date 'Jan 08 99';
                    ^
209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241
HINT:  Perhaps you need a different "datestyle" setting.
SELECT date 'Jan 08 1999';
    date    
------------
 1999-01-08
(1 row)

SELECT date '99 08 Jan';
    date    
------------
 1999-01-08
(1 row)

SELECT date '1999 08 Jan';
    date    
------------
 1999-01-08
(1 row)

SELECT date '99-01-08';
    date    
------------
 1999-01-08
(1 row)

SELECT date '1999-01-08';
    date    
------------
 1999-01-08
(1 row)

SELECT date '08-01-99';
ERROR:  date/time field value out of range: "08-01-99"
242 243
LINE 1: SELECT date '08-01-99';
                    ^
244 245 246
HINT:  Perhaps you need a different "datestyle" setting.
SELECT date '08-01-1999';
ERROR:  date/time field value out of range: "08-01-1999"
247 248
LINE 1: SELECT date '08-01-1999';
                    ^
249 250 251
HINT:  Perhaps you need a different "datestyle" setting.
SELECT date '01-08-99';
ERROR:  date/time field value out of range: "01-08-99"
252 253
LINE 1: SELECT date '01-08-99';
                    ^
254 255 256
HINT:  Perhaps you need a different "datestyle" setting.
SELECT date '01-08-1999';
ERROR:  date/time field value out of range: "01-08-1999"
257 258
LINE 1: SELECT date '01-08-1999';
                    ^
259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285
HINT:  Perhaps you need a different "datestyle" setting.
SELECT date '99-08-01';
    date    
------------
 1999-08-01
(1 row)

SELECT date '1999-08-01';
    date    
------------
 1999-08-01
(1 row)

SELECT date '99 01 08';
    date    
------------
 1999-01-08
(1 row)

SELECT date '1999 01 08';
    date    
------------
 1999-01-08
(1 row)

SELECT date '08 01 99';
ERROR:  date/time field value out of range: "08 01 99"
286 287
LINE 1: SELECT date '08 01 99';
                    ^
288 289 290
HINT:  Perhaps you need a different "datestyle" setting.
SELECT date '08 01 1999';
ERROR:  date/time field value out of range: "08 01 1999"
291 292
LINE 1: SELECT date '08 01 1999';
                    ^
293 294 295
HINT:  Perhaps you need a different "datestyle" setting.
SELECT date '01 08 99';
ERROR:  date/time field value out of range: "01 08 99"
296 297
LINE 1: SELECT date '01 08 99';
                    ^
298 299 300
HINT:  Perhaps you need a different "datestyle" setting.
SELECT date '01 08 1999';
ERROR:  date/time field value out of range: "01 08 1999"
301 302
LINE 1: SELECT date '01 08 1999';
                    ^
303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342
HINT:  Perhaps you need a different "datestyle" setting.
SELECT date '99 08 01';
    date    
------------
 1999-08-01
(1 row)

SELECT date '1999 08 01';
    date    
------------
 1999-08-01
(1 row)

SET datestyle TO dmy;
SELECT date 'January 8, 1999';
    date    
------------
 1999-01-08
(1 row)

SELECT date '1999-01-08';
    date    
------------
 1999-01-08
(1 row)

SELECT date '1999-01-18';
    date    
------------
 1999-01-18
(1 row)

SELECT date '1/8/1999';
    date    
------------
 1999-08-01
(1 row)

SELECT date '1/18/1999';
ERROR:  date/time field value out of range: "1/18/1999"
343 344
LINE 1: SELECT date '1/18/1999';
                    ^
345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389
HINT:  Perhaps you need a different "datestyle" setting.
SELECT date '18/1/1999';
    date    
------------
 1999-01-18
(1 row)

SELECT date '01/02/03';
    date    
------------
 2003-02-01
(1 row)

SELECT date '19990108';
    date    
------------
 1999-01-08
(1 row)

SELECT date '990108';
    date    
------------
 1999-01-08
(1 row)

SELECT date '1999.008';
    date    
------------
 1999-01-08
(1 row)

SELECT date 'J2451187';
    date    
------------
 1999-01-08
(1 row)

SELECT date 'January 8, 99 BC';
     date      
---------------
 0099-01-08 BC
(1 row)

SELECT date '99-Jan-08';
ERROR:  date/time field value out of range: "99-Jan-08"
390 391
LINE 1: SELECT date '99-Jan-08';
                    ^
392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424
HINT:  Perhaps you need a different "datestyle" setting.
SELECT date '1999-Jan-08';
    date    
------------
 1999-01-08
(1 row)

SELECT date '08-Jan-99';
    date    
------------
 1999-01-08
(1 row)

SELECT date '08-Jan-1999';
    date    
------------
 1999-01-08
(1 row)

SELECT date 'Jan-08-99';
    date    
------------
 1999-01-08
(1 row)

SELECT date 'Jan-08-1999';
    date    
------------
 1999-01-08
(1 row)

SELECT date '99-08-Jan';
ERROR:  invalid input syntax for type date: "99-08-Jan"
425 426
LINE 1: SELECT date '99-08-Jan';
                    ^
427 428
SELECT date '1999-08-Jan';
ERROR:  invalid input syntax for type date: "1999-08-Jan"
429 430
LINE 1: SELECT date '1999-08-Jan';
                    ^
431 432
SELECT date '99 Jan 08';
ERROR:  date/time field value out of range: "99 Jan 08"
433 434
LINE 1: SELECT date '99 Jan 08';
                    ^
435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467
HINT:  Perhaps you need a different "datestyle" setting.
SELECT date '1999 Jan 08';
    date    
------------
 1999-01-08
(1 row)

SELECT date '08 Jan 99';
    date    
------------
 1999-01-08
(1 row)

SELECT date '08 Jan 1999';
    date    
------------
 1999-01-08
(1 row)

SELECT date 'Jan 08 99';
    date    
------------
 1999-01-08
(1 row)

SELECT date 'Jan 08 1999';
    date    
------------
 1999-01-08
(1 row)

SELECT date '99 08 Jan';
ERROR:  invalid input syntax for type date: "99 08 Jan"
468 469
LINE 1: SELECT date '99 08 Jan';
                    ^
470 471 472 473 474 475 476 477
SELECT date '1999 08 Jan';
    date    
------------
 1999-01-08
(1 row)

SELECT date '99-01-08';
ERROR:  date/time field value out of range: "99-01-08"
478 479
LINE 1: SELECT date '99-01-08';
                    ^
480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512
HINT:  Perhaps you need a different "datestyle" setting.
SELECT date '1999-01-08';
    date    
------------
 1999-01-08
(1 row)

SELECT date '08-01-99';
    date    
------------
 1999-01-08
(1 row)

SELECT date '08-01-1999';
    date    
------------
 1999-01-08
(1 row)

SELECT date '01-08-99';
    date    
------------
 1999-08-01
(1 row)

SELECT date '01-08-1999';
    date    
------------
 1999-08-01
(1 row)

SELECT date '99-08-01';
ERROR:  date/time field value out of range: "99-08-01"
513 514
LINE 1: SELECT date '99-08-01';
                    ^
515 516 517 518 519 520 521 522 523
HINT:  Perhaps you need a different "datestyle" setting.
SELECT date '1999-08-01';
    date    
------------
 1999-08-01
(1 row)

SELECT date '99 01 08';
ERROR:  date/time field value out of range: "99 01 08"
524 525
LINE 1: SELECT date '99 01 08';
                    ^
526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558
HINT:  Perhaps you need a different "datestyle" setting.
SELECT date '1999 01 08';
    date    
------------
 1999-01-08
(1 row)

SELECT date '08 01 99';
    date    
------------
 1999-01-08
(1 row)

SELECT date '08 01 1999';
    date    
------------
 1999-01-08
(1 row)

SELECT date '01 08 99';
    date    
------------
 1999-08-01
(1 row)

SELECT date '01 08 1999';
    date    
------------
 1999-08-01
(1 row)

SELECT date '99 08 01';
ERROR:  date/time field value out of range: "99 08 01"
559 560
LINE 1: SELECT date '99 08 01';
                    ^
561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600
HINT:  Perhaps you need a different "datestyle" setting.
SELECT date '1999 08 01';
    date    
------------
 1999-08-01
(1 row)

SET datestyle TO mdy;
SELECT date 'January 8, 1999';
    date    
------------
 1999-01-08
(1 row)

SELECT date '1999-01-08';
    date    
------------
 1999-01-08
(1 row)

SELECT date '1999-01-18';
    date    
------------
 1999-01-18
(1 row)

SELECT date '1/8/1999';
    date    
------------
 1999-01-08
(1 row)

SELECT date '1/18/1999';
    date    
------------
 1999-01-18
(1 row)

SELECT date '18/1/1999';
ERROR:  date/time field value out of range: "18/1/1999"
601 602
LINE 1: SELECT date '18/1/1999';
                    ^
603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641
HINT:  Perhaps you need a different "datestyle" setting.
SELECT date '01/02/03';
    date    
------------
 2003-01-02
(1 row)

SELECT date '19990108';
    date    
------------
 1999-01-08
(1 row)

SELECT date '990108';
    date    
------------
 1999-01-08
(1 row)

SELECT date '1999.008';
    date    
------------
 1999-01-08
(1 row)

SELECT date 'J2451187';
    date    
------------
 1999-01-08
(1 row)

SELECT date 'January 8, 99 BC';
     date      
---------------
 0099-01-08 BC
(1 row)

SELECT date '99-Jan-08';
ERROR:  date/time field value out of range: "99-Jan-08"
642 643
LINE 1: SELECT date '99-Jan-08';
                    ^
644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676
HINT:  Perhaps you need a different "datestyle" setting.
SELECT date '1999-Jan-08';
    date    
------------
 1999-01-08
(1 row)

SELECT date '08-Jan-99';
    date    
------------
 1999-01-08
(1 row)

SELECT date '08-Jan-1999';
    date    
------------
 1999-01-08
(1 row)

SELECT date 'Jan-08-99';
    date    
------------
 1999-01-08
(1 row)

SELECT date 'Jan-08-1999';
    date    
------------
 1999-01-08
(1 row)

SELECT date '99-08-Jan';
ERROR:  invalid input syntax for type date: "99-08-Jan"
677 678
LINE 1: SELECT date '99-08-Jan';
                    ^
679 680
SELECT date '1999-08-Jan';
ERROR:  invalid input syntax for type date: "1999-08-Jan"
681 682
LINE 1: SELECT date '1999-08-Jan';
                    ^
683 684
SELECT date '99 Jan 08';
ERROR:  invalid input syntax for type date: "99 Jan 08"
685 686
LINE 1: SELECT date '99 Jan 08';
                    ^
687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718
SELECT date '1999 Jan 08';
    date    
------------
 1999-01-08
(1 row)

SELECT date '08 Jan 99';
    date    
------------
 1999-01-08
(1 row)

SELECT date '08 Jan 1999';
    date    
------------
 1999-01-08
(1 row)

SELECT date 'Jan 08 99';
    date    
------------
 1999-01-08
(1 row)

SELECT date 'Jan 08 1999';
    date    
------------
 1999-01-08
(1 row)

SELECT date '99 08 Jan';
ERROR:  invalid input syntax for type date: "99 08 Jan"
719 720
LINE 1: SELECT date '99 08 Jan';
                    ^
721 722 723 724 725 726 727 728
SELECT date '1999 08 Jan';
    date    
------------
 1999-01-08
(1 row)

SELECT date '99-01-08';
ERROR:  date/time field value out of range: "99-01-08"
729 730
LINE 1: SELECT date '99-01-08';
                    ^
731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763
HINT:  Perhaps you need a different "datestyle" setting.
SELECT date '1999-01-08';
    date    
------------
 1999-01-08
(1 row)

SELECT date '08-01-99';
    date    
------------
 1999-08-01
(1 row)

SELECT date '08-01-1999';
    date    
------------
 1999-08-01
(1 row)

SELECT date '01-08-99';
    date    
------------
 1999-01-08
(1 row)

SELECT date '01-08-1999';
    date    
------------
 1999-01-08
(1 row)

SELECT date '99-08-01';
ERROR:  date/time field value out of range: "99-08-01"
764 765
LINE 1: SELECT date '99-08-01';
                    ^
766 767 768 769 770 771 772 773 774
HINT:  Perhaps you need a different "datestyle" setting.
SELECT date '1999-08-01';
    date    
------------
 1999-08-01
(1 row)

SELECT date '99 01 08';
ERROR:  date/time field value out of range: "99 01 08"
775 776
LINE 1: SELECT date '99 01 08';
                    ^
777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809
HINT:  Perhaps you need a different "datestyle" setting.
SELECT date '1999 01 08';
    date    
------------
 1999-01-08
(1 row)

SELECT date '08 01 99';
    date    
------------
 1999-08-01
(1 row)

SELECT date '08 01 1999';
    date    
------------
 1999-08-01
(1 row)

SELECT date '01 08 99';
    date    
------------
 1999-01-08
(1 row)

SELECT date '01 08 1999';
    date    
------------
 1999-01-08
(1 row)

SELECT date '99 08 01';
ERROR:  date/time field value out of range: "99 08 01"
810 811
LINE 1: SELECT date '99 08 01';
                    ^
812 813 814 815 816 817 818 819
HINT:  Perhaps you need a different "datestyle" setting.
SELECT date '1999 08 01';
    date    
------------
 1999-08-01
(1 row)

RESET datestyle;
820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899
--
-- Simple math
-- Leave most of it for the horology tests
--
SELECT f1 - date '2000-01-01' AS "Days From 2K" FROM DATE_TBL;
 Days From 2K 
--------------
       -15607
       -15542
        -1403
        -1402
        -1401
        -1400
        -1037
        -1036
        -1035
           91
           92
           93
        13977
        14343
        14710
(15 rows)

SELECT f1 - date 'epoch' AS "Days From Epoch" FROM DATE_TBL;
 Days From Epoch 
-----------------
           -4650
           -4585
            9554
            9555
            9556
            9557
            9920
            9921
            9922
           11048
           11049
           11050
           24934
           25300
           25667
(15 rows)

SELECT date 'yesterday' - date 'today' AS "One day";
 One day 
---------
      -1
(1 row)

SELECT date 'today' - date 'tomorrow' AS "One day";
 One day 
---------
      -1
(1 row)

SELECT date 'yesterday' - date 'tomorrow' AS "Two days";
 Two days 
----------
       -2
(1 row)

SELECT date 'tomorrow' - date 'today' AS "One day";
 One day 
---------
       1
(1 row)

SELECT date 'today' - date 'yesterday' AS "One day";
 One day 
---------
       1
(1 row)

SELECT date 'tomorrow' - date 'yesterday' AS "Two days";
 Two days 
----------
        2
(1 row)

900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010
--
-- test extract!
--
-- century
--
SELECT EXTRACT(CENTURY FROM DATE '0101-12-31 BC'); -- -2
 date_part 
-----------
        -2
(1 row)

SELECT EXTRACT(CENTURY FROM DATE '0100-12-31 BC'); -- -1
 date_part 
-----------
        -1
(1 row)

SELECT EXTRACT(CENTURY FROM DATE '0001-12-31 BC'); -- -1
 date_part 
-----------
        -1
(1 row)

SELECT EXTRACT(CENTURY FROM DATE '0001-01-01');    --  1
 date_part 
-----------
         1
(1 row)

SELECT EXTRACT(CENTURY FROM DATE '0001-01-01 AD'); --  1
 date_part 
-----------
         1
(1 row)

SELECT EXTRACT(CENTURY FROM DATE '1900-12-31');    -- 19
 date_part 
-----------
        19
(1 row)

SELECT EXTRACT(CENTURY FROM DATE '1901-01-01');    -- 20
 date_part 
-----------
        20
(1 row)

SELECT EXTRACT(CENTURY FROM DATE '2000-12-31');    -- 20
 date_part 
-----------
        20
(1 row)

SELECT EXTRACT(CENTURY FROM DATE '2001-01-01');    -- 21
 date_part 
-----------
        21
(1 row)

SELECT EXTRACT(CENTURY FROM CURRENT_DATE)>=21 AS True;     -- true
 true 
------
 t
(1 row)

--
-- millennium
--
SELECT EXTRACT(MILLENNIUM FROM DATE '0001-12-31 BC'); -- -1
 date_part 
-----------
        -1
(1 row)

SELECT EXTRACT(MILLENNIUM FROM DATE '0001-01-01 AD'); --  1
 date_part 
-----------
         1
(1 row)

SELECT EXTRACT(MILLENNIUM FROM DATE '1000-12-31');    --  1
 date_part 
-----------
         1
(1 row)

SELECT EXTRACT(MILLENNIUM FROM DATE '1001-01-01');    --  2
 date_part 
-----------
         2
(1 row)

SELECT EXTRACT(MILLENNIUM FROM DATE '2000-12-31');    --  2
 date_part 
-----------
         2
(1 row)

SELECT EXTRACT(MILLENNIUM FROM DATE '2001-01-01');    --  3
 date_part 
-----------
         3
(1 row)

-- next test to be fixed on the turn of the next millennium;-)
SELECT EXTRACT(MILLENNIUM FROM CURRENT_DATE);         --  3
 date_part 
-----------
         3
(1 row)

1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159
--
-- decade
--
SELECT EXTRACT(DECADE FROM DATE '1994-12-25');    -- 199
 date_part 
-----------
       199
(1 row)

SELECT EXTRACT(DECADE FROM DATE '0010-01-01');    --   1
 date_part 
-----------
         1
(1 row)

SELECT EXTRACT(DECADE FROM DATE '0009-12-31');    --   0
 date_part 
-----------
         0
(1 row)

SELECT EXTRACT(DECADE FROM DATE '0001-01-01 BC'); --   0
 date_part 
-----------
         0
(1 row)

SELECT EXTRACT(DECADE FROM DATE '0002-12-31 BC'); --  -1
 date_part 
-----------
        -1
(1 row)

SELECT EXTRACT(DECADE FROM DATE '0011-01-01 BC'); --  -1
 date_part 
-----------
        -1
(1 row)

SELECT EXTRACT(DECADE FROM DATE '0012-12-31 BC'); --  -2
 date_part 
-----------
        -2
(1 row)

--
-- some other types:
--
-- on a timestamp.
SELECT EXTRACT(CENTURY FROM NOW())>=21 AS True;       -- true
 true 
------
 t
(1 row)

SELECT EXTRACT(CENTURY FROM TIMESTAMP '1970-03-20 04:30:00.00000'); -- 20
 date_part 
-----------
        20
(1 row)

-- on an interval
SELECT EXTRACT(CENTURY FROM INTERVAL '100 y');  -- 1
 date_part 
-----------
         1
(1 row)

SELECT EXTRACT(CENTURY FROM INTERVAL '99 y');   -- 0
 date_part 
-----------
         0
(1 row)

SELECT EXTRACT(CENTURY FROM INTERVAL '-99 y');  -- 0
 date_part 
-----------
         0
(1 row)

SELECT EXTRACT(CENTURY FROM INTERVAL '-100 y'); -- -1
 date_part 
-----------
        -1
(1 row)

--
-- test trunc function!
--
SELECT DATE_TRUNC('MILLENNIUM', TIMESTAMP '1970-03-20 04:30:00.00000'); -- 1001
        date_trunc        
--------------------------
 Thu Jan 01 00:00:00 1001
(1 row)

SELECT DATE_TRUNC('MILLENNIUM', DATE '1970-03-20'); -- 1001-01-01
          date_trunc          
------------------------------
 Thu Jan 01 00:00:00 1001 PST
(1 row)

SELECT DATE_TRUNC('CENTURY', TIMESTAMP '1970-03-20 04:30:00.00000'); -- 1901
        date_trunc        
--------------------------
 Tue Jan 01 00:00:00 1901
(1 row)

SELECT DATE_TRUNC('CENTURY', DATE '1970-03-20'); -- 1901
          date_trunc          
------------------------------
 Tue Jan 01 00:00:00 1901 PST
(1 row)

SELECT DATE_TRUNC('CENTURY', DATE '2004-08-10'); -- 2001-01-01
          date_trunc          
------------------------------
 Mon Jan 01 00:00:00 2001 PST
(1 row)

SELECT DATE_TRUNC('CENTURY', DATE '0002-02-04'); -- 0001-01-01
          date_trunc          
------------------------------
 Mon Jan 01 00:00:00 0001 PST
(1 row)

SELECT DATE_TRUNC('CENTURY', DATE '0055-08-10 BC'); -- 0100-01-01 BC
           date_trunc            
---------------------------------
 Tue Jan 01 00:00:00 0100 PST BC
(1 row)

SELECT DATE_TRUNC('DECADE', DATE '1993-12-25'); -- 1990-01-01
          date_trunc          
------------------------------
 Mon Jan 01 00:00:00 1990 PST
(1 row)

SELECT DATE_TRUNC('DECADE', DATE '0004-12-25'); -- 0001-01-01 BC
           date_trunc            
---------------------------------
 Sat Jan 01 00:00:00 0001 PST BC
(1 row)

SELECT DATE_TRUNC('DECADE', DATE '0002-12-31 BC'); -- 0011-01-01 BC
           date_trunc            
---------------------------------
 Mon Jan 01 00:00:00 0011 PST BC
(1 row)

1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186
--
-- test infinity
--
select 'infinity'::date, '-infinity'::date;
   date   |   date    
----------+-----------
 infinity | -infinity
(1 row)

select 'infinity'::date > 'today'::date as t;
 t 
---
 t
(1 row)

select '-infinity'::date < 'today'::date as t;
 t 
---
 t
(1 row)

select isfinite('infinity'::date), isfinite('-infinity'::date), isfinite('today'::date);
 isfinite | isfinite | isfinite 
----------+----------+----------
 f        | f        | t
(1 row)