Year with 2 cycles per month Periodicity for SPSS Time Series Trends

I am attempting to establish periodicity within my data set that includes 2 cycles for each month of the year. So for example, year 1(2015), month 1 (January) has two cycles, month 2 (February) has two cycles, month 3 (March) has two cycles and so forth. Each year would have 24 observations (two cycles per month). Is there a way to handle such periodicity where time series forecasting can be appropriately utilized? I’m currently running SPSS version 24. I developed a workaround by rolling things up to only month and year, but I’m a little concerned the seasonal effects will not be modeled accurately.

Related:

Mongodb java client v3.x is fails with java.lang.NoSuchMethodException

WebSphere Application server 8.5.5 fails with the following exception when I used mongo-java-driver-3.2.1.jar but it works fine with mongo-java-driver-2.10.0.jar and mongo-java-driver-2.13.1.jar , please advise…

Reporter:com.ibm.ws.mongodb.internal.ReflectiveMongoClientImpl@7e028370
java.security.PrivilegedActionException: java.lang.NoSuchMethodException: com.mongodb.MongoClient.getMajorVersion()
at java.security.AccessController.doPrivileged(AccessController.java:334)

Related: