Config.DateLocale does not format forecast date and time

[BertLindeman]

Have been busy trying to debug #122.
Conclusion sofar: date and time in the forecast boxes are formatted using the locale that is active at the start of the clock. The Config.DateLocale has no grip on this.

Added a few debug lines to the clock to see the locale being used.

Running host with LC_TIME="en_US.UTF-8"

Started the clock thus as dutch locale:
LC_TIME=nl_NL.utf8 python PyQtPiClock.py Config-xenon462

In Config-xenon462.py:

DateLocale = 'ru_RU.utf8'

Part of the output:

DEBUG in mainline: setlocale(2, ru_RU.utf8)
.......
getting current and forecast:Sat Feb  9 17:32:07 2019
https://api.darksky.net/forecast/xxxxxxxxx/69.008562,33.089993?units=auto&lang=ru&r=0.576085599256
wxstart for radar1
wxstart for radar2
DEBUG in range(0, 3) DBGday fmt:{0:%A %H:%M} time:1549735200 value:zaterdag 19:00
('DEBUG in range(0, 3) locale LC_TIME:%s', "('nl_NL', 'UTF-8')")
DEBUG in range(0, 3) DBGday fmt:{0:%A %H:%M} time:1549746000 value:zaterdag 22:00
('DEBUG in range(0, 3) locale LC_TIME:%s', "('nl_NL', 'UTF-8')")
DEBUG in range(0, 3) DBGday fmt:{0:%A %H:%M} time:1549756800 value:zondag 01:00
('DEBUG in range(0, 3) locale LC_TIME:%s', "('nl_NL', 'UTF-8')")
DEBUG in tick()  setlocale(2, ru_RU.utf8)

I do not have enough python background to understand apparently.
In the mainline we see ru_RU.utf8 being set as LC_TIME (shown as 2).

And yet nl_NL is used for the forecasts.
So I do not understand. . . . .

Secondary thought. is the locale set too many times?
My thought would be ONCE should be enough.

[BertLindeman]

Found an issue QT backend changes locale
That issue made me test with: test_locale_sub0.py

#!/usr/bin/env python2
# -*- coding: UTF-8 -*-

import locale

DateLocale = 'ru_RU.utf8'

def setlocale():
    try:
        locale.setlocale(locale.LC_TIME, DateLocale)
    except Exception as e:
        print("FAIL  setlocale(%s, %s) ERR:%s" % (locale.LC_TIME, DateLocale, e))

print("Before SETlocale LC_TIME:%s" % str(locale.getlocale(locale.LC_TIME)))
setlocale()
print("getlocale LC_TIME:%s" % str(locale.getlocale(locale.LC_TIME)))

from PyQt4 import QtGui
print("after import            \tgetlocale LC_TIME:%s" % str(locale.getlocale(locale.LC_TIME)))

a = QtGui.QApplication([])
print("after QtGui.Qapplication\tgetlocale LC_TIME:%s" % str(locale.getlocale(locale.LC_TIME)))

w = QtGui.QWidget()
print("after QtGui.QWidget     \tgetlocale LC_TIME:%s" % str(locale.getlocale(locale.LC_TIME)))

w.show()
print("after w.show()          \tgetlocale LC_TIME:%s" % str(locale.getlocale(locale.LC_TIME)))

That shows that the locale has been reset after the definition of the Qapplication:

Before SETlocale LC_TIME:(None, None)
getlocale LC_TIME:('ru_RU', 'UTF-8')
after import                    getlocale LC_TIME:('ru_RU', 'UTF-8')
after QtGui.Qapplication        getlocale LC_TIME:('en_US', 'UTF-8')
after QtGui.QWidget             getlocale LC_TIME:('en_US', 'UTF-8')
after w.show()                  getlocale LC_TIME:('en_US', 'UTF-8')

Added a setlocale after QtGui.QApplication and then the locale does not change back to en_US anymore:

after import                    getlocale LC_TIME:('ru_RU', 'UTF-8')
after QtGui.Qapplication        getlocale LC_TIME:('en_US', 'UTF-8')
setlocale AGAIN getlocale LC_TIME:('ru_RU', 'UTF-8')
after QtGui.QWidget             getlocale LC_TIME:('ru_RU', 'UTF-8')
after w.show()                  getlocale LC_TIME:('ru_RU', 'UTF-8')

As I have no experience with QT: does anyone know a way to tell QApplication to use the current locale on the definition?