I want to store times in a database table but only need to store the hours and minutes. I know I could just use DATETIME and ignore the other components of the date, but what's the best way to do this without storing more info than I actually need?
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1What is the equivalent of TIME for sql server 2005 ? – Erran Morad Apr 03 '14 at 21:52
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1@BoratSagdiyev there isn't one in SQL Server 2005, that's why I asked the question. – Matthew Dresser Apr 04 '14 at 13:00
15 Answers
You could store it as an integer of the number of minutes past midnight:
eg.
0 = 00:00
60 = 01:00
252 = 04:12
You would however need to write some code to reconstitute the time, but that shouldn't be tricky.

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10Then use DATEADD() to get real times back. Even smallint would be enough. – Joel Coehoorn Feb 11 '09 at 21:02
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45been there, done that ... mins=dd%60 and hours=dd/60 on ints does the trick. – Osama Al-Maadeed Feb 14 '09 at 00:37
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1we need to store some variant of days, hours and minutes; the Time data type in SQL Server only goes up to 23:59:59 so we couldn't use that. Inspired by your answer we decided to have three int columns for days: hours: mins for maximum flexibility. thanks! – matao Jan 14 '15 at 01:10
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i personally prefer to use INT to store Hi formatted time. so 1:45 will be 145, 20:30 will be 2030. in my opinion, this way is more human-readable and could be used to determine overlapping time. – gema Sep 02 '19 at 13:16
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1here is code that I made to convert string to int, and int to string: https://gist.github.com/maksimu/1cb71f502cd77ce8cd8a88180952fa85 – Maksim Jan 16 '20 at 19:07
If you are using SQL Server 2008+, consider the TIME
datatype. SQLTeam article with more usage examples.

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DATETIME start DATETIME end
I implore you to use two DATETIME values instead, labelled something like event_start and event_end.
Time is a complex business
Most of the world has now adopted the denery based metric system for most measurements, rightly or wrongly. This is good overall, because at least we can all agree that a g, is a ml, is a cubic cm. At least approximately so. The metric system has many flaws, but at least it's internationally consistently flawed.
With time however, we have; 1000 milliseconds in a second, 60 seconds to a minute, 60 minutes to an hour, 12 hours for each half a day, approximately 30 days per month which vary by the month and even year in question, each country has its time offset from others, the way time is formatted in each country vary.
It's a lot to digest, but the long and short of it is impossible for such a complex scenario to have a simple solution.
Some corners can be cut, but there are those where it is wiser not to
Although the top answer here suggests that you store an integer of minutes past midnight might seem perfectly reasonable, I have learned to avoid doing so the hard way.
The reasons to implement two DATETIME values are for an increase in accuracy, resolution and feedback.
These are all very handy for when the design produces undesirable results.
Am I storing more data than required?
It might initially appear like more information is being stored than I require, but there is a good reason to take this hit.
Storing this extra information almost always ends up saving me time and effort in the long-run, because I inevitably find that when somebody is told how long something took, they'll additionally want to know when and where the event took place too.
It's a huge planet
In the past, I have been guilty of ignoring that there are other countries on this planet aside from my own. It seemed like a good idea at the time, but this has ALWAYS resulted in problems, headaches and wasted time later on down the line. ALWAYS consider all time zones.
C#
A DateTime renders nicely to a string in C#. The ToString(string Format) method is compact and easy to read.
E.g.
new TimeSpan(EventStart.Ticks - EventEnd.Ticks).ToString("h'h 'm'm 's's'")
SQL server
Also if you're reading your database seperate to your application interface, then dateTimes are pleasnat to read at a glance and performing calculations on them are straightforward.
E.g.
SELECT DATEDIFF(MINUTE, event_start, event_end)
ISO8601 date standard
If using SQLite then you don't have this, so instead use a Text field and store it in ISO8601 format eg.
"2013-01-27T12:30:00+0000"
Notes:
This uses 24 hour clock*
The time offset (or +0000) part of the ISO8601 maps directly to longitude value of a GPS coordiate (not taking into account daylight saving or countrywide).
E.g.
TimeOffset=(±Longitude.24)/360
...where ± refers to east or west direction.
It is therefore worth considering if it would be worth storing longitude, latitude and altitude along with the data. This will vary in application.
ISO8601 is an international format.
The wiki is very good for further details at http://en.wikipedia.org/wiki/ISO_8601.
The date and time is stored in international time and the offset is recorded depending on where in the world the time was stored.
In my experience there is always a need to store the full date and time, regardless of whether I think there is when I begin the project. ISO8601 is a very good, futureproof way of doing it.
Additional advice for free
It is also worth grouping events together like a chain. E.g. if recording a race, the whole event could be grouped by racer, race_circuit, circuit_checkpoints and circuit_laps.
In my experience, it is also wise to identify who stored the record. Either as a seperate table populated via trigger or as an additional column within the original table.
The more you put in, the more you get out
I completely understand the desire to be as economical with space as possible, but I would rarely do so at the expense of losing information.
A rule of thumb with databases is as the title says, a database can only tell you as much as it has data for, and it can be very costly to go back through historical data, filling in gaps.
The solution is to get it correct first time. This is certainly easier said than done, but you should now have a deeper insight of effective database design and subsequently stand a much improved chance of getting it right the first time.
The better your initial design, the less costly the repairs will be later on.
I only say all this, because if I could go back in time then it is what I'd tell myself when I got there.

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2Your comment "The +0000 part of the ISO8601 maps directly to lattitude in a GPS coordiate" is wrong. It represents the [offset from UTC](https://en.wikipedia.org/wiki/UTC_offset) – Gary Walker May 29 '19 at 13:15
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just way too long-winded, and I don't see how it even answers this question. OP wants to store a time like "8:30am" ... why would he need 2 datetime fields for that? 2 fields at all? I feel like your answer just became a personal reflection about how timezones are tricky in software and random other DB advice. – Don Cheadle Sep 11 '20 at 15:24
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The OP wants to store a period of time, not the actual time. Storing this as two dates costs twice the storage, but gives additional information that you wouldn't otherwise get from storing as an integer of minutes, etc. Using it depends on whether knowing the start and end time is worthwhile to your program, and in my experience it usually is. – WonderWorker Sep 15 '20 at 09:33
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This approach doesn't work when you just need a time, for example you want something to be each Monday at 10:00-13:00, I don't want to have to create a row every Monday. I just want to check server side it's a Monday then pull out the time if so. – Sean T Sep 30 '20 at 12:49
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Further to the original post W.r.t. if dealing with multiple time-zones, UTC rather than local time has much to recommend it. ;) – Zeek2 Oct 28 '20 at 14:20
Just store a regular datetime and ignore everything else. Why spend extra time writing code that loads an int, manipulates it, and converts it into a datetime, when you could just load a datetime?

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3One possible reason could be to save space on the hard drive - A `DATETIME` data type takes 4 bytes to store, while a `SMALLINT` for instance, only takes a quarter of that. No big difference if you only have a few thousand rows, but if you have many millions of rows as many companies do, then your space savings will be substantial. – Sheridan Aug 28 '12 at 10:38
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41Possibly, but consider that 12 people answered this question, each taking, say, 15 minutes to think about it. Assume that they're all programmers and make $50 per hour. With the cost of the time spent just to *think* about this problem, you could have bought a shiny new 2TB hard drive to store the extra bytes. – Seth Aug 28 '12 at 21:46
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@Seth you right if we talk only about extra bytes. But your suggest can be only if it is small project with 1-2 developers. But it will be a big project with a lot of developers(plus QA) it would be a big problem when a new programmer tries to figure this out. Alas, we all depend on business logic. – Mediator Jul 05 '16 at 07:06
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With cloud services, saving disk space can be important in cases where you pay per byte read/processed. – RedShift Nov 20 '17 at 08:41
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3Another fun problem is if you are relying on the time component, it will not account for the Daylight savings adjustments when used at different times of the year. – Chris Seufert Nov 23 '17 at 01:21
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since you didn't mention it bit if you are on SQL Server 2008 you can use the time datatype otherwise use minutes since midnight

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If you are using MySQL use a field type of TIME and the associated functionality that comes with TIME.
00:00:00 is standard unix time format.
If you ever have to look back and review the tables by hand, integers can be more confusing than an actual time stamp.

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SQL Server actually stores time as fractions of a day. For example, 1 whole day = value of 1. 12 hours is a value of 0.5.
If you want to store the time value without utilizing a DATETIME type, storing the time in a decimal form would suit that need, while also making conversion to a DATETIME simple.
For example:
SELECT CAST(0.5 AS DATETIME)
--1900-01-01 12:00:00.000
Storing the value as a DECIMAL(9,9) would consume 5 bytes. However, if precision to not of utmost importance, a REAL would consume only 4 bytes. In either case, aggregate calculation (i.e. mean time) can be easily calculated on numeric values, but not on Data/Time types.

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"SQL Server actually stores time as fractions of a day." I think it stores days since (or before) 01-Jan-1900 in the first 4 bytes and time, in milliseconds, in the second 4 bytes. (SmallDateTime uses 2 bytes for each with narrower date range, and minutes, rather than milliseconds for time) – Kristen Feb 14 '09 at 18:19
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I would convert them to an integer (HH*3600 + MM*60), and store it that way. Small storage size, and still easy enough to work with.

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Instead of minutes-past-midnight we store it as 24 hours clock, as an SMALLINT.
09:12 = 912 14:15 = 1415
when converting back to "human readable form" we just insert a colon ":" two characters from the right. Left-pad with zeros if you need to. Saves the mathematics each way, and uses a few fewer bytes (compared to varchar), plus enforces that the value is numeric (rather than alphanumeric)
Pretty goofy though ... there should have been a TIME datatype in MS SQL for many a year already IMHO ...

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Kristen is absolutely correct, but only if her assumption about the hours and minutes only representing a single 24 hour period is correct. 10 bits are required to stored 0..1439 minutes. This means there are an additional 6 bits that can be used as you like, so there's room to get creative. I'd suggest using 5 bits to store the hour offset for the time-zone you're in, but only if the asker only wanted to store a maximum time of 23:59 (one minute to midnight) – WonderWorker Oct 20 '15 at 08:14
What I think you're asking for is a variable that will store minutes as a number. This can be done with the varying types of integer variable:
SELECT 9823754987598 AS MinutesInput
Then, in your program you could simply view this in the form you'd like by calculating:
long MinutesInAnHour = 60;
long MinutesInADay = MinutesInAnHour * 24;
long MinutesInAWeek = MinutesInADay * 7;
long MinutesCalc = long.Parse(rdr["MinutesInput"].toString()); //BigInt converts to long. rdr is an SqlDataReader.
long Weeks = MinutesCalc / MinutesInAWeek;
MinutesCalc -= Weeks * MinutesInAWeek;
long Days = MinutesCalc / MinutesInADay;
MinutesCalc -= Days * MinutesInADay;
long Hours = MinutesCalc / MinutesInAnHour;
MinutesCalc -= Hours * MinutesInAnHour;
long Minutes = MinutesCalc;
An issue arises where you request for efficiency to be used. But, if you're short for time then just use a nullable BigInt to store your minutes value.
A value of null means that the time hasn't been recorded yet.
Now, I will explain in the form of a round-trip to outer-space.
Unfortunately, a table column will only store a single type. Therefore, you will need to create a new table for each type as it is required.
For example:
If MinutesInput = 0..255 then use TinyInt (Convert as described above).
If MinutesInput = 256..131071 then use SmallInt (Note: SmallInt's min value is -32,768. Therefore, negate and add 32768 when storing and retrieving value to utilise full range before converting as above).
If MinutesInput = 131072..8589934591 then use Int (Note: Negate and add 2147483648 as necessary).
If MinutesInput = 8589934592..36893488147419103231 then use BigInt (Note: Add and negate 9223372036854775808 as necessary).
If MinutesInput > 36893488147419103231 then I'd personally use VARCHAR(X) increasing X as necessary since a char is a byte. I shall have to revisit this answer at a later date to describe this in full (or maybe a fellow stackoverflowee can finish this answer).
Since each value will undoubtedly require a unique key, the efficiency of the database will only be apparent if the range of the values stored are a good mix between very small (close to 0 minutes) and very high (Greater than 8589934591).
Until the values being stored actually reach a number greater than 36893488147419103231 then you might as well have a single BigInt column to represent your minutes, as you won't need to waste an Int on a unique identifier and another int to store the minutes value.

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Try smalldatetime. It may not give you what you want but it will help you in your future needs in date/time manipulations.

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if @mdresser was using < MSSQL 2005 the server would trough "out-of-range smalldatetime value" – Fergus Oct 24 '13 at 04:03
Are you sure you will only ever need the hours and minutes? If you want to do anything meaningful with it (like for example compute time spans between two such data points) not having information about time zones and DST may give incorrect results. Time zones do maybe not apply in your case, but DST most certainly will.

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The saving of time in UTC format can help better as Kristen suggested.
Make sure that you are using 24 hr clock because there is no meridian AM or PM be used in UTC.
Example:
- 4:12 AM - 0412
- 10:12 AM - 1012
- 2:28 PM - 1428
- 11:56 PM - 2356
Its still preferrable to use standard four digit format.

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Store the ticks
as a long
/bigint
, which are currently measured in milliseconds. The updated value can be found by looking at the TimeSpan.TicksPerSecond
value.
Most databases have a DateTime type that automatically stores the time as ticks behind the scenes, but in the case of some databases e.g. SqlLite, storing ticks can be a way to store the date.
Most languages allow the easy conversion from Ticks
→ TimeSpan
→ Ticks
.
Example
In C# the code would be:
long TimeAsTicks = TimeAsTimeSpan.Ticks;
TimeAsTimeSpan = TimeSpan.FromTicks(TimeAsTicks);
Be aware though, because in the case of SqlLite, which only offers a small number of different types, which are; INT
, REAL
and VARCHAR
It will be necessary to store the number of ticks as a string or two INT
cells combined. This is, because an INT
is a 32bit signed number whereas BIGINT
is a 64bit signed number.
Note
My personal preference however, would be to store the date and time as an ISO8601
string.

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IMHO what the best solution is depends to some extent on how you store time in the rest of the database (and the rest of your application)
Personally I have worked with SQLite and try to always use unix timestamps for storing absolute time, so when dealing with the time of day (like you ask for) I do what Glen Solsberry writes in his answer and store the number of seconds since midnight
When taking this general approach people (including me!) reading the code are less confused if I use the same standard everywhere

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