Week number unique sortable integer id
My question is about programming philosophy, I give an example in PHP language but can be asked in any programming language:
- If I have to give an unique sortable integer ID to a day, I can use
'Ymd'format - If I have to give an unique sortable integer ID to a month, I can use
'Ym'format - If I have to give an unique sortable integer ID to a week, I cannot use
'YW'format
Because of 2017-01-01 and 2017-12-31 will return the same week ID:
$date1 = DateTime::createFromFormat('Y-m-d', '2017-01-01');
$date2 = DateTime::createFromFormat('Y-m-d', '2017-12-31');
echo $date1->format('YW').' '.$date2->format('YW');
// returns 201752 201752
So I can use the first day ID of the week as unique sortable integer ID week but there is maybe a simpler way to solve it ? A better practice ?
php datetime
asked Nov 27 '18 at 15:34
alexalex
3,23152148
add a comment |
My question is about programming philosophy, I give an example in PHP language but can be asked in any programming language:
- If I have to give an unique sortable integer ID to a day, I can use
'Ymd'format - If I have to give an unique sortable integer ID to a month, I can use
'Ym'format - If I have to give an unique sortable integer ID to a week, I cannot use
'YW'format
Because of 2017-01-01 and 2017-12-31 will return the same week ID:
$date1 = DateTime::createFromFormat('Y-m-d', '2017-01-01');
$date2 = DateTime::createFromFormat('Y-m-d', '2017-12-31');
echo $date1->format('YW').' '.$date2->format('YW');
// returns 201752 201752
So I can use the first day ID of the week as unique sortable integer ID week but there is maybe a simpler way to solve it ? A better practice ?
php datetime
asked Nov 27 '18 at 15:34
alexalex
3,23152148
add a comment |
My question is about programming philosophy, I give an example in PHP language but can be asked in any programming language:
- If I have to give an unique sortable integer ID to a day, I can use
'Ymd'format - If I have to give an unique sortable integer ID to a month, I can use
'Ym'format - If I have to give an unique sortable integer ID to a week, I cannot use
'YW'format
Because of 2017-01-01 and 2017-12-31 will return the same week ID:
$date1 = DateTime::createFromFormat('Y-m-d', '2017-01-01');
$date2 = DateTime::createFromFormat('Y-m-d', '2017-12-31');
echo $date1->format('YW').' '.$date2->format('YW');
// returns 201752 201752
So I can use the first day ID of the week as unique sortable integer ID week but there is maybe a simpler way to solve it ? A better practice ?
php datetime
asked Nov 27 '18 at 15:34
alexalex
3,23152148
My question is about programming philosophy, I give an example in PHP language but can be asked in any programming language:
- If I have to give an unique sortable integer ID to a day, I can use
'Ymd'format - If I have to give an unique sortable integer ID to a month, I can use
'Ym'format - If I have to give an unique sortable integer ID to a week, I cannot use
'YW'format
Because of 2017-01-01 and 2017-12-31 will return the same week ID:
$date1 = DateTime::createFromFormat('Y-m-d', '2017-01-01');
$date2 = DateTime::createFromFormat('Y-m-d', '2017-12-31');
echo $date1->format('YW').' '.$date2->format('YW');
// returns 201752 201752
So I can use the first day ID of the week as unique sortable integer ID week but there is maybe a simpler way to solve it ? A better practice ?
php datetime
php datetime
asked Nov 27 '18 at 15:34
alexalex
3,23152148
asked Nov 27 '18 at 15:34
alexalex
3,23152148
asked Nov 27 '18 at 15:34
alexalex
3,23152148
asked Nov 27 '18 at 15:34
alexalex
3,23152148
asked Nov 27 '18 at 15:34
alexalex
3,23152148
3,23152148
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
You can use o instead:
echo $date1->format('oW').' '.$date2->format('oW');
//201652 201752
o ISO-8601 week-numbering year. This has the same value as Y, except that if the ISO week number (W) belongs to the previous or next year, that year is used instead. (added in PHP 5.1.0)
http://php.net/manual/en/function.date.php
answered Nov 27 '18 at 15:40
Felippe DuarteFelippe Duarte
10.6k21624
Exactly what I need, thank you very much for your help
– alex
Nov 27 '18 at 15:42
No problem @alex. You can mark as accepted if it works for you.
– Felippe Duarte
Nov 27 '18 at 15:44
add a comment |
You've to be aware when using week numbers with years. There is already a contribution note at php.net for this scenario 6 years back. Have a look here, Hope this will help you understand clearly :)
Reason:
Y is year from the date
o is ISO-8601 year number
W is ISO-8601 week number of year
$date1 = DateTime::createFromFormat('Y-m-d', '2017-01-01');
$date2 = DateTime::createFromFormat('Y-m-d', '2017-12-31');
echo $date1->format('YW').' '.$date2->format('YW');
echo PHP_EOL;
echo $date1->format('oW').' '.$date2->format('oW');
DEMO: https://3v4l.org/sMKAF
answered Nov 27 '18 at 15:44
Always SunnyAlways Sunny
16.4k32848
Thank you very much, I was not aware about'o'format.
– alex
Nov 27 '18 at 15:48
You're welcome, Best of luck mate:)
– Always Sunny
Nov 27 '18 at 15:49
add a comment |
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53503048%2fweek-number-unique-sortable-integer-id%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
You can use o instead:
echo $date1->format('oW').' '.$date2->format('oW');
//201652 201752
o ISO-8601 week-numbering year. This has the same value as Y, except that if the ISO week number (W) belongs to the previous or next year, that year is used instead. (added in PHP 5.1.0)
http://php.net/manual/en/function.date.php
answered Nov 27 '18 at 15:40
Felippe DuarteFelippe Duarte
10.6k21624
Exactly what I need, thank you very much for your help
– alex
Nov 27 '18 at 15:42
No problem @alex. You can mark as accepted if it works for you.
– Felippe Duarte
Nov 27 '18 at 15:44
add a comment |
You can use o instead:
echo $date1->format('oW').' '.$date2->format('oW');
//201652 201752
o ISO-8601 week-numbering year. This has the same value as Y, except that if the ISO week number (W) belongs to the previous or next year, that year is used instead. (added in PHP 5.1.0)
http://php.net/manual/en/function.date.php
answered Nov 27 '18 at 15:40
Felippe DuarteFelippe Duarte
10.6k21624
Exactly what I need, thank you very much for your help
– alex
Nov 27 '18 at 15:42
No problem @alex. You can mark as accepted if it works for you.
– Felippe Duarte
Nov 27 '18 at 15:44
add a comment |
You can use o instead:
echo $date1->format('oW').' '.$date2->format('oW');
//201652 201752
o ISO-8601 week-numbering year. This has the same value as Y, except that if the ISO week number (W) belongs to the previous or next year, that year is used instead. (added in PHP 5.1.0)
http://php.net/manual/en/function.date.php
answered Nov 27 '18 at 15:40
Felippe DuarteFelippe Duarte
10.6k21624
You can use o instead:
echo $date1->format('oW').' '.$date2->format('oW');
//201652 201752
o ISO-8601 week-numbering year. This has the same value as Y, except that if the ISO week number (W) belongs to the previous or next year, that year is used instead. (added in PHP 5.1.0)
http://php.net/manual/en/function.date.php
answered Nov 27 '18 at 15:40
Felippe DuarteFelippe Duarte
10.6k21624
answered Nov 27 '18 at 15:40
Felippe DuarteFelippe Duarte
10.6k21624
answered Nov 27 '18 at 15:40
Felippe DuarteFelippe Duarte
10.6k21624
answered Nov 27 '18 at 15:40
Felippe DuarteFelippe Duarte
10.6k21624
10.6k21624
Exactly what I need, thank you very much for your help
– alex
Nov 27 '18 at 15:42
No problem @alex. You can mark as accepted if it works for you.
– Felippe Duarte
Nov 27 '18 at 15:44
add a comment |
Exactly what I need, thank you very much for your help
– alex
Nov 27 '18 at 15:42
No problem @alex. You can mark as accepted if it works for you.
– Felippe Duarte
Nov 27 '18 at 15:44
Exactly what I need, thank you very much for your help
– alex
Nov 27 '18 at 15:42
Exactly what I need, thank you very much for your help
– alex
Nov 27 '18 at 15:42
No problem @alex. You can mark as accepted if it works for you.
– Felippe Duarte
Nov 27 '18 at 15:44
No problem @alex. You can mark as accepted if it works for you.
– Felippe Duarte
Nov 27 '18 at 15:44
add a comment |
You've to be aware when using week numbers with years. There is already a contribution note at php.net for this scenario 6 years back. Have a look here, Hope this will help you understand clearly :)
Reason:
Y is year from the date
o is ISO-8601 year number
W is ISO-8601 week number of year
$date1 = DateTime::createFromFormat('Y-m-d', '2017-01-01');
$date2 = DateTime::createFromFormat('Y-m-d', '2017-12-31');
echo $date1->format('YW').' '.$date2->format('YW');
echo PHP_EOL;
echo $date1->format('oW').' '.$date2->format('oW');
DEMO: https://3v4l.org/sMKAF
answered Nov 27 '18 at 15:44
Always SunnyAlways Sunny
16.4k32848
Thank you very much, I was not aware about'o'format.
– alex
Nov 27 '18 at 15:48
You're welcome, Best of luck mate:)
– Always Sunny
Nov 27 '18 at 15:49
add a comment |
You've to be aware when using week numbers with years. There is already a contribution note at php.net for this scenario 6 years back. Have a look here, Hope this will help you understand clearly :)
Reason:
Y is year from the date
o is ISO-8601 year number
W is ISO-8601 week number of year
$date1 = DateTime::createFromFormat('Y-m-d', '2017-01-01');
$date2 = DateTime::createFromFormat('Y-m-d', '2017-12-31');
echo $date1->format('YW').' '.$date2->format('YW');
echo PHP_EOL;
echo $date1->format('oW').' '.$date2->format('oW');
DEMO: https://3v4l.org/sMKAF
answered Nov 27 '18 at 15:44
Always SunnyAlways Sunny
16.4k32848
Thank you very much, I was not aware about'o'format.
– alex
Nov 27 '18 at 15:48
You're welcome, Best of luck mate:)
– Always Sunny
Nov 27 '18 at 15:49
add a comment |
You've to be aware when using week numbers with years. There is already a contribution note at php.net for this scenario 6 years back. Have a look here, Hope this will help you understand clearly :)
Reason:
Y is year from the date
o is ISO-8601 year number
W is ISO-8601 week number of year
$date1 = DateTime::createFromFormat('Y-m-d', '2017-01-01');
$date2 = DateTime::createFromFormat('Y-m-d', '2017-12-31');
echo $date1->format('YW').' '.$date2->format('YW');
echo PHP_EOL;
echo $date1->format('oW').' '.$date2->format('oW');
DEMO: https://3v4l.org/sMKAF
answered Nov 27 '18 at 15:44
Always SunnyAlways Sunny
16.4k32848
You've to be aware when using week numbers with years. There is already a contribution note at php.net for this scenario 6 years back. Have a look here, Hope this will help you understand clearly :)
Reason:
Y is year from the date
o is ISO-8601 year number
W is ISO-8601 week number of year
$date1 = DateTime::createFromFormat('Y-m-d', '2017-01-01');
$date2 = DateTime::createFromFormat('Y-m-d', '2017-12-31');
echo $date1->format('YW').' '.$date2->format('YW');
echo PHP_EOL;
echo $date1->format('oW').' '.$date2->format('oW');
DEMO: https://3v4l.org/sMKAF
answered Nov 27 '18 at 15:44
Always SunnyAlways Sunny
16.4k32848
edited Nov 27 '18 at 15:50
answered Nov 27 '18 at 15:44
Always SunnyAlways Sunny
16.4k32848
answered Nov 27 '18 at 15:44
Always SunnyAlways Sunny
16.4k32848
answered Nov 27 '18 at 15:44
Always SunnyAlways Sunny
16.4k32848
16.4k32848
Thank you very much, I was not aware about'o'format.
– alex
Nov 27 '18 at 15:48
You're welcome, Best of luck mate:)
– Always Sunny
Nov 27 '18 at 15:49
add a comment |
Thank you very much, I was not aware about'o'format.
– alex
Nov 27 '18 at 15:48
You're welcome, Best of luck mate:)
– Always Sunny
Nov 27 '18 at 15:49
Thank you very much, I was not aware about
'o' format.– alex
Nov 27 '18 at 15:48
Thank you very much, I was not aware about
'o' format.– alex
Nov 27 '18 at 15:48
You're welcome, Best of luck mate:)
– Always Sunny
Nov 27 '18 at 15:49
You're welcome, Best of luck mate:)
– Always Sunny
Nov 27 '18 at 15:49
add a comment |
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53503048%2fweek-number-unique-sortable-integer-id%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
