[rrd-users] RRA weekly aggregation not on Thursday

[JL mrtg]

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



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