[solved]Time offset

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I have set sunrise device. I need to move the times of two hours back.
For example, if the time is 12:01:18 and I do subtract two hours., “{$-rio Amazonas-manaus.sunrise - 2}” I get the result 10.
Solution could be to shift the position of two hours to the east, but it is not completely clear solution.
Has anyone suggested solutions similar thing?

@wutu How about timeFormat(timeDecimal($-rio Amazonas-manaus.sunrise)-2)? I didnt test it, but timeDecimal(12:01:18) will change 12:01:18 to 12.021666… and timeFormat(10.021666) should change it back to 10:01:18.

@Marie many thx. Works like a charm.