Booking Tatkal Tickets on IRCTC
Tatkal booking is open on the previous day. That is, you can book a tatkal ticket one day prior to the date of journey. But, you are alighting the train on the second day of the train, then you should get a tatkal ticket two days before the date of journey.
IRCTC Tatkal Booking Timings
Tatkal timings have been changed from July 2012. Tatkal tickets are now issued from 10:00 AM IST. This should greatly ease IRCTC web traffic not only at peak hour 8AM but also at 10AM. Adding to the good news, Travel Agents are not allowed to book tickets under tatkal scheme till 12:00PM, which is a fair policy and a good move from Indian Railways.
The above timings are valid as of January 2018, to book tatkal tickets.