There is a known issue with which has occurred for Windows 7 & 8 users where the regional settings are defaulting to English (US) following the upgrade to Windows 10 which is the likely cause issues with the Keytime software.
In order to fix this you need to change the regional settings to English (UK) and then restart your machine, please refer to the following steps:
Windows start button > settings > time & language > Under related settings select Additional date time & regional settings > Region/change location > Formats > the format will be set to English ( United States ) needs changing to English (United Kingdom)
An article has been published on the BBC News website which explains the changes that have occurred:
If you have any queries with regards to this please contact the support team on firstname.lastname@example.org