[dahak]

Originally Posted by JMvS

Well, don't forget that quite some time pass during Index, so of course they all age as time flow.
IIRC the events of Railgun are set before the Index arc.
Anyone with a better knowledge of the timeline to confirm?

Spoiler for Manga/Novel timeline:

The bankrobbery with the Pyrokinetic was 16 July. Mikoto and Uiharu meet for the first time.

Mikoto meets Saten on the 18 July. They and Uihara go Shopping. Carnage ensues.

Touma trying to rescue the thugs from Mikoto was 19th July. Index shows up on his balcony the next day. Touma fights Style.

Akemi uses Level Upper on the 21 July.

Saten falls unconscious on 24 July. Much carnage ensues. Touma fights Kanzaki. Less carnage ensues.
Mikoto and Kuroko have to clean the swimming pool 25 July.
Touma awakens in hospital 28 July with no memories.