The Panopticon/Series 8 "present day" theory

• "The Time of the Doctor": In the next episode, Strax's scanning confirms that Clara has aged three years since "The Bells of St. John". Taking into account her breaks from the TARDIS, that puts "present day" scenes on December 25, 2016.
• "Into the Dalek": A new school year has started at Coal Hill, placing it near September 2017.
• "Listen": Clara and Danny are on their fist date, so still 2017.
• "Time Heist": Either late 2017 or early 2018.
• "The Caretaker": Danny was present at a previous Parents' Evening. Since he joined the school in "Into the Daleks", this means a whole year has passed, so 2019.
• "Kill the Moon": Courtney is still interestd in TARDIS travel, so still 2019.
• "Mummy on the Orient Express": It's been at least a few weeks since "Kill the Moon", but still seems to be the same year, so still 2019.
• "In the Forest of the Night": Still seems to be 2019.
• "Dark Water" / "Death in Heaven": Clara has had enough time to decide to tell Danny to whole truth, so still seems to be the same year, 2019.