It should actually be possible already. The timer catch event is currently set up to wait 10 days after your variable Date (which presumably is a date variable). Date variables have a hidden default time of 12 am, so your timer catch event is throwing at 12 am 10 days after Date. The repeat then throws daily at 12 am because that's when the original timer was set for. 

What you can try is to switch your Date variable to a date/time variable. If you set your timer catch event to wait 10 days after a date/time variable, it should throw at the time in the variable. The repeats would then throw at this time also. 

If you wanted them all thrown at once, you could also try creating a new date/time variable, then use a calculation to the effect of DateTime = Date + (some number of hours) where you converted all of these appropriately for the calculation. This would take the original Date with the time of 12 am and add some hours to set the time to later. Might need to do a little research on this first.