@HappyCoder Apart from using inputMask you will also need to set a validator. RegExpValidator would be perfect choice for it. A common validator for hh:mm:ss I found was this /^(?:(?:([01]?\d|2[0-3]):)?([0-5]?\d):)?([0-5]?\d)$/
Usage is simple:

validator: RegExpValidator { regExp: /^(?:(?:([01]?\d|2[0-3]):)?([0-5]?\d):)?([0-5]?\d)$/ }

You can also find another validators.