Yes the < symbol is confusing. To be technically correct I update 12:35 as < 12:45. In seat availability page < symbol is not present and while checking PNR status I don't think someone will check Seat availability page. He or she will check the PNR Post. So technically I update it like that way. If the symbol was not there then it won't be an issue plus it is good we update the higher time as one won't get the status at 12:30 but if one visits at 12:45 he or she will surely get the final charting status.