---
title: Time zone confusion
date: "2005-07-08T12:00:00Z"
categories:
  - london-2005
wp_id: 613
description: We missed a conference call after miscalculating the offset between India and the UK. I learned that because the UK uses British Summer Time, Greenwich itself isn't always on GMT, creating a common trap for international scheduling.
keywords: [time zones, gmt, british summer time, ist, daylight saving time]
---

We had a conference call planned at 8:00am. Reva was to join in from India. We got on to the call, and were done by 8:40am.\
9:10am: SMS. **Waited in conference now off to lunch**\
9:56am: Mail. **You didnt initiate the call!**\
10:03am: Reply. **I guess you dialled in at 9am UK time. We had the call at 8am.**\
3:17pm: Mail. **I dialled at 8 GMT = 13.30 IST ? Correct?**\
3:19pm: Reply. **Ah, no. We're 4.5 hours ahead.**\
3:25pm: Mail. **Great Britain is one hour ahead of GMT during summer!**\
3:53pm: Reply. **Yeah, you're right -- most people don't realise Greenwich isn't always on Greenwich Mean Time :-)**