Javascript Date valueOf equivalent in C#

Question

Is there any equivalent of Javascript new Date().valueOf() in C#?

I tried using DateTime.Now.Ticks in c#, but both are different.

I need this because, I'm writing some serverless aws lambda code where they are supporting both nodeJs and C# code.

So, I don't want to get any conflict with datetime in future.

In future, I may query on the datetime values.

https://forums.asp.net/t/2033496.aspx?Convert+objectdotTicks+of+C+to+equivalent+date+value+in+javascript — Ferus7, Aug 16 '17 at 12:24
FWIW `new Date().valueOf()` is the equivalent to `Date.now()` — James, Aug 16 '17 at 12:25
In case you didn't notice, Tim realized his answer was wrong. The answer in the dupetarget is correct. (He's also fixed his answer.) — T.J. Crowder, Aug 16 '17 at 13:11

Tim Schmelter · Accepted Answer · 2017-08-16T13:08:22.447

5

new Date().valueOf returns the millis since january 1, 1970 UTC, you can use this C# code:

DateTime startDt = new DateTime(1970, 1, 1);
TimeSpan timeSpan = DateTime.UtcNow - startDt;
long millis = (long)timeSpan.TotalMilliseconds;

edited Aug 16 '17 at 13:08

answered Aug 16 '17 at 12:25

Tim Schmelter

@Tim : Do I need to use `DateTime.Now- startDt` or `DateTime.UtcNow- startDt`. because the original post is showing based on `UTC` – RealSteel Aug 16 '17 at 12:38
@RealSteel: By accepting this answer, you've made it impossible for Tim to delete it and instead post it on the dupetarget. – T.J. Crowder Aug 16 '17 at 12:40
Oh, I didn't knew this :( – RealSteel Aug 16 '17 at 12:43
@TimSchmelter: I just tried it and it seems that using `UtcNow` **is** correct, which I find surprising. When I do the above, I get an answer that's an hour off (I'm on British Summer Time). – T.J. Crowder Aug 16 '17 at 12:46
@TimSchmelter: I tested the result against the value I get from `Date.now()` on a browser. It's definitely an hour off (and isn't when I use `UtcNow`). I don't yet understand *why*, but it's quite clear. – T.J. Crowder Aug 16 '17 at 13:04
@T.J.Crowder: i see, i have overloooked in my link that it's the number of millis since 1970 but in UTC. Then it's `DateTime.UtcNow` – Tim Schmelter Aug 16 '17 at 13:06
This is now just a duplicate of the answer on the dupetarget. – T.J. Crowder Aug 16 '17 at 13:07
@T.J.Crowder: cannot delete – Tim Schmelter Aug 16 '17 at 13:08
:-) Quite true. – T.J. Crowder Aug 16 '17 at 13:08

1 Answers1