Having determined that Penal Law § 70.30 (2) (b) imposes a two-year aggregate term of imprisonment, we turn to whether this two-year aggregate term may be reduced by jail time and good time credit a prisoner has earned while incarcerated.  Penal Law § 70.30 (3) (b) and (4) (b) provide that, where a prisoner is serving consecutive definite sentences, jail time and good time credit must be applied against the prisoner’s aggregate term of imprisonment (see Penal Law § 70.30 [3] [b]; [4] [b] [emphasis added]), although good time credit may not exceed one third of that aggregate term (see id. at [4] [b]; Correction Law § 804 [1]).

Considering these directives together with section 70.30 (2) (b), it follows that, in cases where the two-year limit on consecutive definite sentences applies, jail time and good time credit must be applied against the two-year aggregate term rather than the aggregate term imposed by the sentencing court. Under such circumstances, correctional authorities should calculate the time to be served under the sentences by reducing the two-year aggregate term by the available jail time credit and any good time credit that does not exceed 243 days (or one-third of the two-year aggregate term) (see Penal Law § 70.30 [3] [b]; [4] [b]).  People ex rel Ryan… v Cheverko…, 183, CtApp 11-21-13

Here, “[a]ny jail time served prior to the maximum expiration date of the [2001] sentence was properly credited toward that sentence until it expired on its own terms on [July 4, 2009] … .  “Thus, the [2009] sentence was properly credited only with jail time served after the expiration of the [2001] sentence” ….  In other words, “petitioner is not entitled to jail time credit against the [2009] sentence for the jail time that was credited against the [2001] sentence”… .  Matter of Grahm v Walsh, 811, 4th Dept 7-19-13