Question: I have a received a server log which has entries for each row with date something like this below. 

23:18.6

23:23.6

I want to convert these dates in DD/MM/YY HH:MM:SS format in excel, but when I do this I get value like 00/01/1900 00:23:19 

Please can you some let me know what kind of format is this date/time entries.

Answer: 
I agree with Scott Helme's point in another answer here. But in some extreme situations (security issues, API breaking changes...) where you absolutely need the users to update to continue using the app, you could provide a simple versioning API. The API would look like this: 

versionCheck API: 

Request parameters:

* `int appVersion`

Response

1. `boolean forceUpgrade`
2. `boolean recommendUpgrade`

When your app starts, you could call this API that pass in the current app version, and check the response of the versioning API call. 

If `forceUpgrade` is `true`, show a popup dialog with options to either let user quit the app, or go to Google Play Store to upgrade the app. 

Else if `recommendUpgrade` is `true`, show the pop-up dialog with options to update or to continue using the app. 

Even with this forced upgrade ability in place, you should continue to support older versions, unless absolutely needed.
you can do this by doing a match between a version number that is kept on app in a variable and similarly the current app version is kept on server side and each time user opens the app the first request should be send to check that if it founds matching do nothing simply let the user use your app otherwise fire an intent to the google playstore or open a webview window to your app(window.open("<https://play.google.com/store/apps/details?id=package_name>", '\_system', 'location=yes');) and there they will automatically have the button asking for update that's what google playstore does for you if you dont have automatic updates on.