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2014-08-29T21:23:03+08:00

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529 is the greatest number below 530 that rounds up to 530
so since you round up when the next digit is 5 and up
5-1=4
530+4=534
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2014-08-29T21:26:07+08:00
534 :0
531=530
532=530
533=530
534=530
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