www.digitalmars.com         C & C++   DMDScript  

digitalmars.D.learn - SysTime comparesin - dropMiliseconds

reply User <user dlang.org> writes:
I have to synchronize a directory. If remote file is newer I copy 
to local. If local file is newer I copy it to remote server. For 
some reason remote timestamp does not contain milliseconds, so 
comparison (localFileTime < remoteFileTime, etc) fails. I need 
help to drop milliseconds from local file timestamp.
Aug 12 2018
next sibling parent User <user dlang.org> writes:
On Sunday, 12 August 2018 at 19:50:44 UTC, User wrote:

 I have to synchronize a directory. If remote file is newer I 
 copy to local. If local file is newer I copy it to remote 
 server. For some reason remote timestamp does not contain 
 milliseconds, so comparison (localFileTime < remoteFileTime, 
 etc) fails. I need help to drop milliseconds from local file 
 timestamp.


auto m = dur!("seconds")(1);
if ((remote - local) > m)
Aug 12 2018
prev sibling parent Jonathan M Davis <newsgroup.d jmdavisprog.com> writes:
On Sunday, August 12, 2018 1:50:44 PM MDT User via Digitalmars-d-learn 
wrote:

 I have to synchronize a directory. If remote file is newer I copy
 to local. If local file is newer I copy it to remote server. For
 some reason remote timestamp does not contain milliseconds, so
 comparison (localFileTime < remoteFileTime, etc) fails. I need
 help to drop milliseconds from local file timestamp.


If you want to drop the milliseconds from a SysTime, you can always set its
fracSecs to Duration.zero. e.g.

st1.fracSecs = Duration.zero;
if(st1 < st2)
{
    ...
}

You could also cast the two SysTimes to DateTime and compare the result
(since DateTime doesn't have fractional seconds), but you'd probably want to
use toUTC() to ensure that the SysTimes had the same time zone when
converting, or you'd risk subtle bugs. e.g. something like

if(cast(DateTime)st1.toUTC() < cast(DatetTime)st2.toUTC())
{
    ...
}

- Jonathan M Davis
Aug 12 2018