Merge two different times in cron format

I want to combine two different times which are in cron format into single time in bash shell script: e.g.

time1 = 15 03 * * 1-5 
time2 = 15 03 * * 6

result should be

15 03 * * 1-6

or e.g.

time1 = 00 05 * * 1-3 
time2 = 00 05 * * 3-5

result should be

00 05 * * 1-5

I can ignore time part for now and only consider day of the week.