First of all let’s clarify what I mean by Sharepoint current datetime in the title. This is the datetime which you can see in Created column when create new item in the list or upload new document to the doclib. As you probably know internally Sharepoint stores all datetimes in content database in UTC format. In the Site settings > Regional settings it is possible to specify timezone for the current site. Depending on selected timezone Sharepoint will show datetimes to end users (if you will change timezone and update list view, values in Created and Modified fields will be changed). I.e. Sharepoint current datetime is not always the same as server date time which is set in OS.
One of the ways is to use _spPageContextInfo.clientServerTimeDelta variable which is defined like that:
If you will check my other article How to get URL of current site collection and other server side properties on client site in Sharepoint, you will find that date defined in string in example above is current UTC date time:
There will be difference with actual server time depending on how late above code will be executed, but not crucial. The problem is that _spPageContextInfo.clientServerTimeDelta may not be always available on your page, so let’s consider other approach as well.
it doesn’t takes into consideration daylight bias. I.e. more correct approach is the following:
I intentially converted serverDateTime variable to string using toISOString() function, because in this format it may be added to the CAML query for comparing with Created or Modified date.
In order to get Sharepoint current datetime we need to combine 2 approaches: to the server’s current UTC datetime
add offset like shown in example above. As result we will get time which is almost the same that is shown in Created/Modified fields. Hope that this information will help you in your work.