N. The local time offset (from UTC) will not change during office hours.
I got bitten by this once when developing a scheduling tool for project management. Since daylight-saving offset changes were always close to midnight, I assumed they would not occur while anyone was using my program (and there was no point in using it outside "office hours.")
Then a technician on a night shift used my program on the night DST kicked in, it went into an infinite loop and took down the CRM database server, disabling automatic software updates and an (unrelated) DRM system.
I got bitten by this once when developing a scheduling tool for project management. Since daylight-saving offset changes were always close to midnight, I assumed they would not occur while anyone was using my program (and there was no point in using it outside "office hours.")
Then a technician on a night shift used my program on the night DST kicked in, it went into an infinite loop and took down the CRM database server, disabling automatic software updates and an (unrelated) DRM system.