RRA weekly aggregation not on Thursday

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RRA weekly aggregation not on Thursday

JL mrtg
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Hi,
¿It's possible to create an RRA weekly aggregation that not aggregate every Thursday ? ¿Why no on Sunday or Monday, in fact the day I want?
I understand, by default an RRA aggregation begins from 1-1-1970.... a Thursday :(

My example is:
...
RRA:AVERAGE:0.5:1w:53w

> rrdtool  fetch RRAw.rrd  -s -3w  -r 1w AVERAGE; ./RRAwTraduce.pl
Thu Feb 18 00:00:00 2016 1455753600: 100 200
Thu Feb 25 00:00:00 2016 1456358400: 100 200
Thu Mar  3 00:00:00 2016 1456963200: nan nan
Thu Mar 10 00:00:00 2016 1457568000: nan nan

I think if I create an RRD with starttime a Sunday or Monday or .... the RRA aggregation would do on Sunday or Monday or ....but It seems I was wrong :(

¿ The only solution is a daily RRA ?

Thank you very much in advance