StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

PO
primarykey
Id
12005592
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2012-08-17T12:14:06.237
FavoriteCount
0
LastActivityDate
2012-08-17T12:28:00.100
LastEditDate
2012-08-17T12:28:00.100
LastEditorUserId
1031900
OwnerUserId
45664
ParentId
12005476
PostTypeId
2
Score
4
ViewCount
0
LastEditorDisplayName
text
Body
Not only is it legal, is it required. The behaviour is officially defined in the <a href="http://ecma-international.org/ecma-262/5.1/#sec-15.9.5.34" rel="nofollow">ECMAScript specification</a>, section 15.9.5.34: <blockquote> Date.prototype.setHours (hour [, min [, sec [, ms ] ] ] ) If min is not specified, this behaves as if min were specified with the value <code>getMinutes()</code>. If sec is not specified, this behaves as if sec were specified with the value <code>getSeconds()</code>. If ms is not specified, this behaves as if ms were specified with the value <code>getMilliseconds()</code>. <ol> <li>Let t be the result of LocalTime(this time value).</li> <li>Let h be ToNumber(hour).</li> <li>If min is not specified, then let m be MinFromTime(t); otherwise, let m be ToNumber(min).</li> <li>If sec is not specified, then let s be SecFromTime(t); otherwise, let s be ToNumber(sec).</li> <li>If ms is not specified, then let milli be msFromTime(t); otherwise, let milli be ToNumber(ms).</li> <li>Let date be MakeDate(Day(t), MakeTime(h, m, s, milli)).</li> <li>Let u be TimeClip(UTC(date)).</li> <li>Set the [[PrimitiveValue]] internal property of this Date object to u.</li> <li>Return u</li> </ol> </blockquote> And the specification for <code>MakeTime</code>, used in step 6, ultimately calculates a millisecond offset by multiplying the various parts together. There are no preconditions for bounds on the arguments (other than that they are finite), so a negative number of hours is legal, and will result in a negative result. Thus the overall result, that is midnight + (-1 hours), does need to be 23:00 on the previous day to conform with the spec.
Tags
Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POWhat is the correct behaviour for date.setHours(-1)?
 singulars
 PostTypePostTypeId
 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USOfir Farchy
UserOwnerUserId
1. USAndrzej Doyle
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. This table or related slice is empty.
VotesPostIdCreationDate
1. VO
 singulars
 PostPostId
 PO
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
2. VO
 singulars
 PostPostId
 PO
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
3. VO
 singulars
 PostPostId
 PO
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
CommentsPostId
1. This table or related slice is empty.

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.