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digitalmars.D.learn - Get milliseconds from time and construct time based on milliseconds

reply bauss <jacobbauss gmail.com> writes:
I have two questions that I can't seem to find a solution to 
after looking at std.datetime.

First question is how do I get the current time but in 
milliseconds?

Second is how do I construct a time ex. systime or datetime based 
on milliseconds?

Thanks
May 28
parent reply Ferhat =?UTF-8?B?S3VydHVsbXXFnw==?= <aferust gmail.com> writes:
On Tuesday, 28 May 2024 at 17:37:42 UTC, bauss wrote:

 I have two questions that I can't seem to find a solution to 
 after looking at std.datetime.

 First question is how do I get the current time but in 
 milliseconds?

 Second is how do I construct a time ex. systime or datetime 
 based on milliseconds?

 Thanks


Unixtime might be what you want:

import std;

import std.datetime;
import std.stdio;

     void main() {
         // Get the current time in the UTC time zone
         auto currentTime = Clock.currTime();

         // Convert the time to the Unix epoch 
(1970-01-01T00:00:00Z)
         Duration unixTime = currentTime - SysTime(DateTime(1970, 
1, 1), UTC());

         // Get the total milliseconds
         long milliseconds = unixTime.total!"msecs";

         // Print the Unix time in milliseconds
         writeln("Unix time in milliseconds: ", milliseconds);
     }
May 28
parent reply bauss <jacobbauss gmail.com> writes:
On Tuesday, 28 May 2024 at 18:29:17 UTC, Ferhat Kurtulmuş wrote:

 On Tuesday, 28 May 2024 at 17:37:42 UTC, bauss wrote:

 I have two questions that I can't seem to find a solution to 
 after looking at std.datetime.

 First question is how do I get the current time but in 
 milliseconds?

 Second is how do I construct a time ex. systime or datetime 
 based on milliseconds?

 Thanks


 Unixtime might be what you want:

 import std;

 import std.datetime;
 import std.stdio;

     void main() {
         // Get the current time in the UTC time zone
         auto currentTime = Clock.currTime();

         // Convert the time to the Unix epoch 
 (1970-01-01T00:00:00Z)
         Duration unixTime = currentTime - 
 SysTime(DateTime(1970, 1, 1), UTC());

         // Get the total milliseconds
         long milliseconds = unixTime.total!"msecs";

         // Print the Unix time in milliseconds
         writeln("Unix time in milliseconds: ", milliseconds);
     }


Thanks a lot.

Also figured out the second question based on your result.

Simply doing:

```
SysTime(DateTime(1970, 1, 1), UTC()) + dur!"msecs"(milliseconds)
```

Seems to work.
May 28
parent reply Steven Schveighoffer <schveiguy gmail.com> writes:
On Tuesday, 28 May 2024 at 18:41:02 UTC, bauss wrote:

 On Tuesday, 28 May 2024 at 18:29:17 UTC, Ferhat Kurtulmuş wrote:

 On Tuesday, 28 May 2024 at 17:37:42 UTC, bauss wrote:

 I have two questions that I can't seem to find a solution to 
 after looking at std.datetime.

 First question is how do I get the current time but in 
 milliseconds?

 Second is how do I construct a time ex. systime or datetime 
 based on milliseconds?

 Thanks


 Unixtime might be what you want:

 import std;

 import std.datetime;
 import std.stdio;

     void main() {
         // Get the current time in the UTC time zone
         auto currentTime = Clock.currTime();

         // Convert the time to the Unix epoch 
 (1970-01-01T00:00:00Z)
         Duration unixTime = currentTime - 
 SysTime(DateTime(1970, 1, 1), UTC());




You can do `SysTime(unixTimeToStdTime(0))` to get a SysTime that 
is at the unix epoch.


 Also figured out the second question based on your result.

 Simply doing:

 ```
 SysTime(DateTime(1970, 1, 1), UTC()) + dur!"msecs"(milliseconds)
 ```

 Seems to work.


Note there is an `msecs` function:

```d
SysTime(unixTimeToStdTime(0)) + milliseconds.msecs;
```

https://dlang.org/phobos/std_datetime_systime.html#unixTimeToStdTime
https://dlang.org/phobos/core_time.html#msecs

-Steve
May 28
parent bauss <jacobbauss gmail.com> writes:
On Tuesday, 28 May 2024 at 23:18:46 UTC, Steven Schveighoffer 
wrote:

 On Tuesday, 28 May 2024 at 18:41:02 UTC, bauss wrote:

 On Tuesday, 28 May 2024 at 18:29:17 UTC, Ferhat Kurtulmuş 
 wrote:

 On Tuesday, 28 May 2024 at 17:37:42 UTC, bauss wrote:

 I have two questions that I can't seem to find a solution to 
 after looking at std.datetime.

 First question is how do I get the current time but in 
 milliseconds?

 Second is how do I construct a time ex. systime or datetime 
 based on milliseconds?

 Thanks


 Unixtime might be what you want:

 import std;

 import std.datetime;
 import std.stdio;

     void main() {
         // Get the current time in the UTC time zone
         auto currentTime = Clock.currTime();

         // Convert the time to the Unix epoch 
 (1970-01-01T00:00:00Z)
         Duration unixTime = currentTime - 
 SysTime(DateTime(1970, 1, 1), UTC());




 You can do `SysTime(unixTimeToStdTime(0))` to get a SysTime 
 that is at the unix epoch.


 Also figured out the second question based on your result.

 Simply doing:

 ```
 SysTime(DateTime(1970, 1, 1), UTC()) + 
 dur!"msecs"(milliseconds)
 ```

 Seems to work.


 Note there is an `msecs` function:

 ```d
 SysTime(unixTimeToStdTime(0)) + milliseconds.msecs;
 ```

 https://dlang.org/phobos/std_datetime_systime.html#unixTimeToStdTime
 https://dlang.org/phobos/core_time.html#msecs

 -Steve


Thanks! That's a lot cleaner
May 29