{{ ('0' + hour).slice(-2) }}
{{ ('0' + key).slice(-2) }}
{{ ('0' + key).slice(-2) }}
-
{{ hour === undefined ? '' : ('0' + hour).slice(-2) }}
-
{{ minute === undefined ? '' : ('0' + minute).slice(-2) }}
-
{{ second === undefined ? '' : ('0' + second).slice(-2) }}