the problem is the missing leading zero in your time format, it should
be: '07:13:45' instead of '7:13:45'
you can use a small function to fill the time string with leading zeros:
from qgis.core import *
from qgis.gui import *
@qgsfunction(args='auto', group='Custom')
def fill_time(timestring, feature, parent):
list = timestring.split(':')
newtime =
str(list[0]).zfill(2)+':'+str(list[1]).zfill(2)+':'+str(list[2]).zfill(2)
return newtime
and then you can use it in the expression like this:
to_time(fill_time('7:13:45'))
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Am 2019-10-03 00:42, schrieb RMG:
Hello,
I am trying to figure out the duration between one day's survey begin
time (e.g., 7:13:45) and end time (e.g., 9:39:53) in an attribute
table of a line shape file. It has just two attributes begin and end.
But $lengh returns an error message and cannot figure out the
duration. I suspect that the fields are not in proper format. So, I
try to update the fields with
to_time("begin")
Then, it says Eval Error: Cannot convert '7:13:45' to Time.
What is a remedy? The “begin” and “end” are in string.
Best wishes,
Reiko Matsuda Goodwin
Comoé Monkey Project [1]
Guenon Conservation Community [2]
Links:
--
[1] https://www.facebook.com/ComoeMonkeyProject/
[2] http://facebook.com/GuenonConservationCommunity/
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