We start by first installing the Python pytz time zone module, using pip. We type the following command in a command processor prompt:

    pip install pytz

When successful, we get the following result:

This installed the Python pytz module into the site-packages folder, so now we can import this module from our Python GUI code.

We can list all the existing time zones by running the following code, which will display the time zones in our ScrolledText widget. First, we add a new Button widget to our GUI:

import pytz 
class OOP():  
    # TZ Button callback 
    def allTimeZones(self): 
        for tz in pytz.all_timezones: 
            self.scr.insert(tk.INSERT, tz + '
') 

    def createWidgets(self): 
        # Adding a TZ Button 
        self.allTZs = ttk.Button(self.widgetFrame,  
                                 text=self.i18n.timeZones,  
                                 command=self.allTimeZones) 
        self.allTZs.grid(column=0, row=9, sticky='WE')

Clicking our new Button widget results in the following output:

GUI.py

After we install the tzlocal Python module, we can print our current locale by running the following code:

 
    # TZ Local Button callback 
    def localZone(self):    
        from tzlocal import get_localzone 
        self.scr.insert(tk.INSERT, get_localzone()) 

    def createWidgets(self): 
        # Adding local TZ Button 
        self.localTZ = ttk.Button(self.widgetFrame,  
                                  text=self.i18n.localZone,  
                                  command=self.localZone 
        self.localTZ.grid(column=1, row=9, sticky='WE')

We have internationalized the strings of our two new Buttons in Resources.py.

English version:

        self.timeZones = "All Time Zones" 
        self.localZone = "Local Zone"

German version:

        self.timeZones = "Alle Zeitzonen" 
        self.localZone = "Lokale Zone"

Clicking our new button now tells us which time zone we are in (hey, we didn't know that, did we…).

GUI.py

We can now translate our local time to a different time zone. Let's use USA Eastern Standard Time as an example.

We display our current local time in our unused Label 2 by improving our existing code.

When we run the code, our internationalized Label 2 (displayed as Etikette 2 in German) will display the current local time:

GUI.py

We can now change our local time to US EST by first converting it to Coordinated Universal Time (UTC) and then applying the timezone function from the imported pytz module:

import pytz 
class OOP(): 
    # Format local US time with TimeZone info 
    def getDateTime(self): 
        fmtStrZone = "%Y-%m-%d %H:%M:%S %Z%z" 
        # Get Coordinated Universal Time 
        utc = datetime.now(timezone('UTC')) 
        print(utc.strftime(fmtStrZone)) 

        # Convert UTC datetime object to Los Angeles TimeZone 
        la = utc.astimezone(timezone('America/Los_Angeles')) 
        print(la.strftime(fmtStrZone)) 

        # Convert UTC datetime object to New York TimeZone 
        ny = utc.astimezone(timezone('America/New_York')) 
        print(ny.strftime(fmtStrZone)) 

        # update GUI label with NY Time and Zone 
        self.lbl2.set(ny.strftime(fmtStrZone))

Clicking the button, now renamed as New York, results in the following output:

GUI.py

Our Label 2 got updated with the current time in New York and we are printing the UTC times of the cities, Los Angeles and New York, with their respective time zone conversions, relative to the UTC time on the Eclipse console, using a US date formatting string:

GUI.py