Help with Access query

How to add 12 hours to  existing Date
Roman FAsked:
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dateadd("h", 12, Yourdate)
Roman FAuthor Commented:
Thanks for your fast respond, it is not so easy.  I did not finish the question yet...

My StartDateA  returns: 12/10/2013 9:01:00 AM  or 12/10/2013 8:37:00 AM
when i use the formula  New: DateAdd("h",12,[StartDateA])--- I am getting 12/10/2013 12:00:00 PM regardless
Simon BallChief information OfficerCommented:
Looks like its being c0nverted from Datetime to date... then adding the 12 hours.

Is this in a query where startdateA is already an expression?
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Roman FAuthor Commented:

in this case is working
Can you upload sample table? I can't reproduce your case:
Roman FAuthor Commented:
Nope, still does not work,  
DataExtr.StartDate al Old,
DateAdd("h",12,Format([StartDate],"mm/dd/yyyy")) AS New
FROM DataExtr

Old                                        New
1/23/2013 3:44:00 PM          1/23/2013 12:00:00 PM
5/14/2013 8:46:00 AM          5/14/2013 12:00:00 PM
Format([StartDate],"mm/dd/yyyy") removes time from your date/value, so it is expected result.
DateAdd("h",12,[StartDate]) AS New
should work
Roman FAuthor Commented:
To: als315
Addate is working as expected:
Roman FAuthor Commented:
I see, thank you, but i want that, if time is less then 12:00PM it shold be StartDate, it
time is bigger or equal 12:00PM it shold be StartDate+12 hours
Dale FyeOwner, Dev-Soln LLCCommented:
Now I'm confused.   If TimeValue([StartDate]) < #12:00#, then you want [StartDate], but if it is after noon , you want to add 12 hours?

New: iif(TimeValue([StartDate]) <= #12:00#, [StartDate], DateAdd("h", 12, [StartDate]))
Simon BallChief information OfficerCommented:
you can get time by subtracting the integer of the date from itself:

[StartDate] - Int([StartDate])

not sure if you want to work with it as a decimal or a time can probably do

=iff( format("hh",[StartDate] - Int([StartDate])) > 12,DateAdd("h",12,[StartDate]),[StartDate])
Roman FAuthor Commented:
none of the last comments are working,
Roman FAuthor Commented:
IIf(Format([StartDate],"Short Time")< #12:00 PM#,[StartDate],DateAdd("h",12,StartDateA))

it gives me an error in the bolded part
Dale FyeOwner, Dev-Soln LLCCommented:
Once you use the Format() function, the return value will be a string, not a date.  That is why I used the TimeValue() function.

 iif(TimeValue([StartDate]) <= #12:00#, [StartDate], DateAdd("h", 12, [StartDate]))
Roman FAuthor Commented:
Error message
Dale FyeOwner, Dev-Soln LLCCommented:
That syntax worked for me, what version of Access are you using?

Work your way up to it to figure out where the problem is.

StartTime: TimeValue([StartDate])
Roman FAuthor Commented:
I have database submitted, Access 2010
there is no problem with StartTime: TimeValue([StartDate]) , the problem with IIF statement
Dale FyeOwner, Dev-Soln LLCCommented:
You will need to give that computed field in your query a name

New:  iif(TimeValue([StartDate]) <= #12:00#, [StartDate], DateAdd("h", 12, [StartDate]))
Roman FAuthor Commented:
I am really sorry for asking, but have you tried in my database, i have the same error
Dale FyeOwner, Dev-Soln LLCCommented:
That code works fine for me (A2007)  using your database.
Dale's code is working in your sample DB (Access 2010)

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