Android Question calculate next day of a datetime string

M

m643

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Hi all,

I try to find out how I can calculate the next day from a datetime string.
I have already a working calculation but that is based on datetime.now, code for that is:
B4X: 
DateTime.date(DateTime.Add(DateTime.now,0,0,1))

Now, I have a string with format "2013-08-14 14:00:00" I'm looking for something like this:
B4X: 
DateTime.date(DateTime.Add("2013-08-14 14:00:00",0,0,1))

I know that this is not working but I can't find anything how I can parse a datetime and just add 1 day.
 
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Erel

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There are two steps:
1. Parse the date and get the ticks value.
2. Add the required period.

B4X: 
Sub Activity_Create(FirstTime As Boolean)
   Dim s As String = "2013-08-14 14:00:00"
   DateTime.DateFormat = "yyyy-MM-dd"
   DateTime.TimeFormat = "HH:mm:ss"
   Dim i As Int = s.IndexOf(" ")
   Dim ticks As Long = DateTime.DateTimeParse(s.SubString2(0, i), _
     s.SubString2(i + 1, s.Length))
   Dim p As Period
   p.Days = 1
   Dim tomorrow As Long = DateUtils.AddPeriod(ticks, p)
   Log(DateUtils.TicksToString(tomorrow))
End Sub
 
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bsnqt

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Hi m643, something you need to do is very similar to the sample code below..Hope you can find your own way.
DateUtils is very helpful in this case...
Happy coding.

B4X: 
Dim YourTime As Long = DateTime.Now
Dim YourNewTime As Long
Dim p1 As Period
p1.Days = 1
YourNewTime = DateUtils.AddPeriod(YourTime, p1)

EDIT: Sorry Erel I just posted few seconds after you, I don't know you already answered...
 
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M

m643

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Thanks for all the reply's.

Erel: When I execute your code I get 1376568000000 but I need it in the same format "2013-08-15 14:00:00" (+1)
In my example in combination with Datetime.now I get it in the above format back.
 
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M

Mahares

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I use the below code. It returns the correct answer, but it is interesting to see what Erel has to say about this:
B4X: 
Dim s As String = "2013-08-14 14:00:00"
DateTime.DateFormat = "yyyy-MM-dd HH:mm:ss"
Dim tomorrow As Long=DateTime.Add(DateTime.DateParse(s),0,0,1)
Msgbox(DateTime.Date(tomorrow),"") 'returns 2013-08-15 14:00:00
 
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M

m643

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Hi Erel/Mahares,

I forgot in in my Msgbox: DateTime.Date.
Thank you for your support.
 
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