Currently, I believe that you can only query down to the minute. Per Advanced Searching:
Created Search for issues that were created on, before or after a particular date (or date range). Note that if a time-component is not specified, midnight 00:00 will be assumed. Please note that the search results will be relative to your configured time zone (which is by default the JIRA server's time zone). Use one of the following formats:"yyyy/MM/dd HH:mm" "yyyy-MM-dd HH:mm" "yyyy/MM/dd" "yyyy-MM-dd" Or use "w" (weeks), "d" (days), "h" (hours) or "m" (minutes) to specify a date relative to the current time. The default is"m" (minutes). Be sure to use quote-marks ("); if you omit the quote-marks, the number you supply will be interpreted as milliseconds after epoch (1970-1-1). Note: this field does not support auto-complete. Syntax: created or createdDate
It looks like there was also a request for this in the past, but it was marked as Won't Fix:
Badges are a great way to show off community activity, whether you’re a newbie or a Champion.Learn more
A picture tells a thousand words. And agility boards have just released their latest feature: cover images on issues – so now your board can tell a story at first glance. Upload attachmen...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs