Record the date/time at the data collection

Support
1

Hi,
Can someone tell me how to use function now() or today() in Build or Xfrom,
in order to record the date/time at the data collection?
Thanks,
Wen

2

1st: there are properties that you can use to set the start (first begun)
and end times (marked-as-finalized) of a form.

See https://opendatakit.org/help/form-design/examples/#preload_params

and on http://xlsform.org/ search for "Metadata" in XLSForms, these are
added to the settings page.

not sure how to use these within Build.

2nd: if you need to record a date and not allow it to be revised later when
you edit or swipe-through a form (or any calculation that you don't want to
be updated after its first time), you can wrap it in the once() function.
If your calculate expression is:

once(now())

then only if the field is empty will once() execute the calculation that it
wraps and store the resulting value in the field.

ยทยทยท On Tue, Apr 26, 2016 at 8:51 AM, Wen wrote:

Hi,
Can someone tell me how to use function now() or today() in Build or
Xfrom, in order to record the date/time at the data collection?
Thanks,
Wen

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