nl_tokens: https : // html . spec . whatwg . org / multipage / common - microsyntaxes . html#parse - a - time - string
pl_tokens: function parseTimeString ( str ) { const matches = timeRe . exec ( str ) ; if ( ! matches ) { return null ; } const hour = Number ( matches [ 1 ] ) ; if ( hour < 0 || hour > 23 ) { return null ; } const minute = Number ( matches [ 2 ] ) ; if ( minute < 0 || minute > 59 ) { return null ; } const second = matches [ 3 ] !== undefined ? Math . trunc ( Number ( matches [ 3 ] ) ) : 0 ; if ( second < 0 || second >= 60 ) { return null ; } const millisecond = matches [ 4 ] !== undefined ? Number ( matches [ 4 ] ) : 0 ; return { hour , <mask> , second , millisecond } ; }