date

this question already has answers here : ... less what I wanted. The project will have information for months and did not want to have to create its own algorithm for it.

I am developing an electronic point in PHP and would like to know how to do the two-hour Caculo being one of them is negative ... example: Hourly load Day 1: -05:00:00 Hourly load Day 2: 08:00:00 How would the two-hour bill get the balance of hours?

I'm trying to calculate the age by day, month and year but I'm not getting it. I followed some examples but they all go wrong ... mento, então diminui 1. if (today.before(dateOfBirth)) { age--; } return age; }

I have a database where I would insert the dates in the format dd/mm/yyyy (example: 05/11/1987), but now I am organizing some ... bering that this is not a duplicate as I am wanting to update the data in the database and not select them in another format.

To get the first day of the week of the date 07/10/2020, I used the function startOfWeek of the date-fns library. In this way ... 0/2020. const ultimoDiaSemana = endOfWeek(new Date(2020, 9, 7)); // 11/10/2020 errado I would like to know why this happens.