Compare time now against time as a varible

General
1

Hi all im trying to compare 2 times and calculate the difference, one is from a trigger and the other is a pre-set time , I found how to check the times and get the time difference but i can work how to have a set time

Thanks

2

Have you read some doco on js dates? JavaScript Date Set Methods should help you.

3

What format is the set time in?

4

I would like it to have HH:MM

5

Thanks I will have a look but JavaScript is new to me

6

What exactly are you asking? How to enter HH:MM in the dashboard? If not then what?

7

Hi Colin
I what to compare real time to a fixed time and calculate the differences , I cant work out how to create the fixed time eg 10:00:00

8

Do you mean (for example) "How long is it since 10 am?"
Or "How long is it since 10 am on 6th November 2022?"

9

How long since 10 am

10

You mean somthing like this?

let a = new Date().getHours() + 2 //the + 2 is for time zone correction
let b = 10
let c = a - b

msg.payload = c

return msg;
11

Thanks I was try to over complicate it

12

I was thinking of this approach. Probably also overcomplicated.

Untitled 1
Untitled 11000×218 15.3 KB 

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        "name": "function 18",
        "func": "var now = new Date();\nvar tenam= new Date()\ntenam.setHours(10,0,0,0)\nvar diff = now.getTime() - tenam.getTime()\n\nmsg.payload = {\"now\": now, \"then\": tenam, \"difference (seconds)\": diff/1000}\n\n\nreturn msg;",
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13

thanks for the suggestion

14

Just bear in mind that 'new Date()' is z time.

When you 'tenam.setHours(12,0,0,0)' you have to add time zone. I am at +2

{"now":"2022-11-11T14:13:08.881Z","then":"2022-11-11T10:00:00.000Z","difference (seconds)":15188.881}
15

Thanks I did spot tha,t Im in the UK so I have removed it.
Is there a way of getting to adjust for daylight saving

16

Yes with a if statement, check if it is between the certain two dates you change the value of 'tenam.setHours(12,0,0,0)'

17

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