I want to combine two data sets by a common date variable. The first data set was produced using proc expand to convert monthly data to quarterly frequency. The second data set has quarterly data and dates. I cannot merge the two files by date because they don't match up in the two files - while the second data set has informat and format of YYQ6. for the date, the first data set has informat of MMDDYY10. and format of YYQC6. for the date. I gather that the specific day of the quarterly data varies by day within a given quarter in the second data set. I've tried reformatting the date to quarter in the first data set without success. I'd appreciate your thoughts on how to merge the two files.   I'm using SAS 9.4 (TS1M6) on an X64_10PRO platform. Thanks for your help. ... View more