I obviously have not stated my point clearly enough. The proposed text # ... but it is clear that standard time in # Iran started on 1935-06-13 and not 1946. is incorrect. The decision to apply Tehran time in the government offices throughout the country was taken on 1935-06-13 (certainly not at midnight), so that it is by no means clear that it could have been applied on 1935-06-13 at 00:04:16 in the whole country. It is also not clear that usage of UT + 03:30 in government offices implies its usage as standard time. While inclusion of incorrect statements into the comments does not affect the TZif files, it is bound to confuse contributors in the future, who may not have seen the current updates to Asia/Tehran and have to assume that sources for these incorrect statements exist. What really can be stated on the basis of the referenced document is that On 1935-06-13, UT + 03:30 was already in use as Tehran time, so that the switch from LMT to UT + 03:30 cannot have occurred as late as 1946 (as specified by Shanks & Pottenger). Michael Deckers.