Android Question Parsing a date oddity

Andrew (Digitwell) · Feb 9, 2023

I have been having problems parsing datetimes taken from a MYSQL database.

I have finally tracked down the problem to the Datetime.dateparse function.

Can anyone spot what is wrong here.

B4X:

Private Sub B4XPage_Created (Root1 As B4XView)
    Root = Root1
    Root.LoadLayout("MainPage")
    
    Private datestring = "2023-02-10T18:15:22.000000Z"
    
    
    Try   ' I would expect this to succeed
        DateTime.DateFormat = "yyyy-MM-dd'T'HH:mm:ss.000000Z"
        Private da1 As Long = DateTime.DateParse(datestring)
        Log("Parse 1 success")
    Catch
        Log(LastException)
        Log("Date parse 1 failure")
    End Try
    
    Try  ' I would expect this to fail
        DateTime.DateFormat = "yyyy-MM-dd'T'HH:mm:ss"
        Private da1 As Long = DateTime.DateParse(datestring)
        Log("Parse 2 success")
    Catch
        Log(LastException)
        Log("Date parse 2 failure")
    End Try
    
    
End Sub

output from log,

Logger connected to: Google Pixel 2 XL
--------- beginning of main
Copying updated assets files (1)
*** Service (starter) Create ***
** Service (starter) Start **
** Activity (main) Create, isFirst = true **
(ParseException) java.text.ParseException: Unparseable date: "2023-02-10T18:15:22.000000Z"
Date parse 1 failure
Parse 2 success
Call B4XPages.GetManager.LogEvents = True to enable logging B4XPages events.
** Activity (main) Resume **

Why does the wrong date format parse the date correctly?

The same code runs as expected on iOS.

aeric · Feb 9, 2023

Andrew (Digitwell) said:
DateTime.DateFormat = "yyyy-MM-dd'T'HH:mm:ss.000000Z"

I think the format should be:

B4X:

DateTime.DateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSS"

SimpleDateFormat (Java Platform SE 7 )

Edited

Andrew (Digitwell) · Feb 9, 2023

Sorry, Just tried that, it does not work.

I also tried
yyyy-MM-dd'T'HH:mm:ss.SSSz
and
yyyy-MM-dd'T'HH:mm:ss.SSSzZ

No Joy

aeric · Feb 9, 2023

Why you need the milliseconds?
I suggest you just use the 2nd parse method. It is correct and sufficient.

Andrew (Digitwell) · Feb 9, 2023

I don't need the millliseconds. That is the string I get back from a DATETIME column of a MYSQL database.

I only need the DATE part so I ended up trauncating at the T.

aeric · Feb 9, 2023

Andrew (Digitwell) said:
I don't need the millliseconds. That is the string I get back from a DATETIME column of a MYSQL database.

I only need the DATE part so I ended up trauncating at the T.

Then just use:

B4X:

DateTime.DateFormat = "yyyy-MM-dd"

TILogistic · Feb 9, 2023

?

B4X:

    Dim datestring As String = "2023-02-10T18:15:22.000000Z"
    Log(datestring)
    DateTime.SetTimeZone(0)
 
    Log("Parse 1 success")
    DateTime.DateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSSSS"
    Dim da1 As Long = DateTime.DateParse(datestring)
    Log(DateTime.Date(da1))
    Log(DateTime.GetTimeZoneOffsetAt(da1))
 
    Log("Parse 2 success")
    DateTime.DateFormat = "yyyy-MM-dd'T'HH:mm:ss"
    Dim da1 As Long = DateTime.DateParse(datestring)
    Log(DateTime.Date(da1))
    Log(DateTime.GetTimeZoneOffsetAt(da1))

Read: timezone

SimpleDateFormat (Java Platform SE 7 )

docs.oracle.com

mysql

Guide to Time-zones, Conversion between Zones and Storing in MySQL

We often deal with date and time information in our applications and sometimes need to store this information and convert between…

danuka-praneeth.medium.com

Android Question Parsing a date oddity

Andrew (Digitwell)

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aeric

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Andrew (Digitwell)

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aeric

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Andrew (Digitwell)

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aeric

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TILogistic

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SimpleDateFormat (Java Platform SE 7 )

Guide to Time-zones, Conversion between Zones and Storing in MySQL

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