Timezone Knowledge & Reference Guides
Understand how time zones work around the world.
- IST vs GMT: Time Difference and ConversionIndia Standard Time (IST) is 5 hours and 30 minutes ahead of GMT. Learn how to convert between IST and GMT, understand the half-hour offset, and find scheduling windows for India and UK teams.
- GMT vs CET: Time Difference and ConversionGreenwich Mean Time (GMT) is 1 hour behind Central European Time (CET). Learn how to convert between GMT and CET, understand the seasonal gap during European summer, and schedule across the UK and continental Europe.
- The International Date Line ExplainedUnderstand how the International Date Line works, why it exists, and how it affects travel and scheduling across the Pacific.
- How Many Time Zones Are There?The world has 38 or more time zones depending on how you count them. This guide explains why the number is complicated, which countries span the most zones, and how half-hour and quarter-hour offsets add to the total.
- EST vs CET: Time Difference and ConversionEastern Standard Time (EST) is 6 hours behind Central European Time (CET). Learn how to convert between EST and CET, find the best meeting windows for US East Coast and continental Europe, and understand seasonal DST shifts.
- Daylight Saving Time Explained: Who Changes, When, and WhyEverything you need to know about daylight saving time: which countries observe it, when clocks change, and how it affects scheduling.
- Working Hours in Hong Kong: A Timezone GuideHong Kong operates on Hong Kong Time (HKT, UTC+8) year-round with no daylight saving time. This guide covers business hours, financial market schedules, and scheduling windows with Europe and the Americas.
- PST vs IST: Time Difference and ConversionPacific Standard Time (PST) is 13.5 hours behind India Standard Time (IST). Learn how to convert between PST and IST and find the narrow scheduling windows for US West Coast and India teams.
- GMT vs UTC: What's the Difference?Learn the key differences between Greenwich Mean Time (GMT) and Coordinated Universal Time (UTC), and when to use each.
- Working Hours in Paris: A Timezone GuideParis uses CET (UTC+1) in winter and CEST (UTC+2) in summer. This guide covers French business hours, the sacred lunch break, and scheduling windows between Paris and cities in the Americas, UK, and Asia.
- EST vs IST: Time Difference and ConversionEastern Standard Time (EST) is 10.5 hours behind India Standard Time (IST). Learn how to convert between EST and IST, understand the unique half-hour offset, and find workable meeting windows for US and India teams.
- Understanding Time Zone Abbreviations: A Complete GuideDecode common time zone abbreviations like EST, PST, GMT, CET, and IST, and learn why some abbreviations can be ambiguous.
- Working Hours in Berlin: A Timezone GuideBerlin uses CET (UTC+1) in winter and CEST (UTC+2) in summer. This guide covers German business hours, work culture norms, and scheduling windows between Berlin and cities in the US, UK, and Asia.
- PST vs GMT: Time Difference and ConversionPacific Standard Time (PST) is 8 hours behind Greenwich Mean Time (GMT). Learn how to convert between PST and GMT, how the DST mismatch affects the gap, and how to find workable meeting windows between the US West Coast and the UK.
- Working Hours in Mumbai: A Timezone GuideMumbai operates on India Standard Time (IST, UTC+5:30) year-round with no daylight saving time. This guide covers Indian business hours, IST’s unusual half-hour offset, and scheduling windows with the US, Europe, and Asia.
- EST vs GMT: Time Difference and ConversionEastern Standard Time (EST) is 5 hours behind Greenwich Mean Time (GMT). Learn how to convert between EST and GMT, how DST creates a 4-hour gap in summer, and the best scheduling windows for US East Coast and UK teams.
- Working Hours in Sydney: A Timezone GuideSydney uses AEST (UTC+10) in winter and AEDT (UTC+11) in summer. This guide covers Australian business hours, the southern hemisphere DST calendar, and scheduling windows with Asia, Europe, and the Americas.
- CST vs MST: Time Difference and ConversionCentral Standard Time (CST) is 1 hour ahead of Mountain Standard Time (MST). Learn how to convert between CST and MST and understand the border states where both zones meet.
- Working Hours in Dubai: A Timezone GuideDubai operates on Gulf Standard Time (GST, UTC+4) year-round with no daylight saving time. This guide covers UAE business hours, the Monday–Friday work week, and scheduling windows with Europe, Asia, and the Americas.
- PST vs MST: Time Difference and ConversionPacific Standard Time (PST) is 1 hour behind Mountain Standard Time (MST). Learn how to convert between PST and MST, and why Arizona creates a seasonal exception for this 1-hour gap.