Hello,
A very trivial question. I would like to collapse to the mean by converting the daily date to year and the corresponding variable observations obtaining one single value of each variable for each single corresponding year for both time series and panel

Thank you in advance

Code:
* Example generated by -dataex-. To install: ssc install dataex
clear
input float(time bel)
10955  9.49
10958  9.49
10959  9.73
10960  9.73
10961   9.8
10962  9.65
10965  9.65
10966  9.65
10967  9.66
10968  9.66
10969  9.71
10972  9.71
10973  9.73
10974  9.73
10975  9.77
10976  9.84
10979  9.86
10980  9.85
10981  9.85
10982  9.85
10983  9.85
10986  9.85
10987   9.9
10988   9.9
11688 8.553
11689 8.475
11690 8.475
11693 8.475
11694 8.475
11695 8.475
11696 8.413
11697 8.413
11700 8.305
11701 8.305
11702 8.245
11703 8.245
11704 8.245
11707 8.244
11708 8.244
11709 8.198
11710 8.198
11711 8.198
11714 8.198
11715 8.198
11716 8.198
11717 8.198
11718 8.198
end
format %td time