Time Zone Converter — UTC Offsets, DST & Scheduling Across Zones
Learn how time zones and UTC offsets work, why daylight saving time causes scheduling chaos, and how to use a free time zone converter for remote work, server logs, and international meetings.
By sadiqbd · June 6, 2026
Time zones are the quiet cause of more scheduling disasters than anyone admits
A meeting set for "3 PM" means nothing without specifying where. A "3 PM Dhaka time" for a colleague in London is 9 AM their time — but only in winter. In summer, UK clocks shift by an hour for daylight saving, making it 8 AM. In New York, that same "3 PM Dhaka" is 5 AM. These are the kinds of miscommunications that make people miss calls, send emails at midnight, and ship code to production at the worst possible moment.
A time zone converter takes a time in one zone and tells you what it is in another — accounting for offsets, daylight saving time, and the awkward cases where dates change across zones.
How Time Zones Work
The world is divided into 24 primary time zones, each roughly 15° of longitude apart (360° ÷ 24 = 15°). Each zone is defined by an offset from UTC (Coordinated Universal Time) — the international time standard.
Bangladesh Standard Time (BST) is UTC+6 — 6 hours ahead of UTC. There is no daylight saving time in Bangladesh, which actually makes it easier to work with: the offset is constant year-round.
Some important offsets:
| Zone | UTC Offset | Notes |
|---|---|---|
| Bangladesh (BST) | UTC+6 | No DST |
| India (IST) | UTC+5:30 | Half-hour offset; no DST |
| Pakistan (PKT) | UTC+5 | No DST |
| UAE (GST) | UTC+4 | No DST |
| UK (GMT/BST) | UTC+0 / UTC+1 | DST applies (Mar–Oct) |
| Germany/France (CET/CEST) | UTC+1 / UTC+2 | DST applies |
| USA East (EST/EDT) | UTC−5 / UTC−4 | DST applies |
| USA West (PST/PDT) | UTC−8 / UTC−7 | DST applies |
| Japan (JST) | UTC+9 | No DST |
| Australia East (AEST/AEDT) | UTC+10 / UTC+11 | DST (Oct–Apr in SH) |
| Singapore (SGT) | UTC+8 | No DST |
How to Use the Time Zone Converter on sadiqbd.com
- Enter the time — the time you want to convert.
- Select the source time zone — the zone the time is currently in.
- Select the target time zone — the zone you want to convert to.
- Read the result — the equivalent local time, including any date change.
The converter handles DST automatically based on the date — no manual adjustment needed.
Real-World Examples
Scheduling a remote work call
You're in Dhaka (UTC+6) and need to schedule a call with a client in London (UTC+0 in winter, UTC+1 in summer). You want a time that works for both.
In December (London is UTC+0):
- 3:00 PM Dhaka = 9:00 AM London ✓ (good for London)
- 9:00 AM Dhaka = 3:00 AM London ✗ (terrible for London)
In July (London is UTC+1):
- 3:00 PM Dhaka = 8:00 AM London ✓ (acceptable)
If you're also including someone in New York (UTC−5 in winter, UTC−4 in summer):
- December: 3:00 PM Dhaka = 9:00 AM London = 4:00 AM New York ✗
For a three-zone call, the overlap is narrow. The converter helps you find the window where all three parties are in working hours.
API and server log timestamps
Your application server is in UTC. A user reports an issue at "2:30 PM" but doesn't specify their time zone. They're in Dhaka (UTC+6).
2:30 PM Dhaka = 2:30 PM − 6 hours = 8:30 AM UTC
You check the server logs for 08:30 UTC and find the error. Without the conversion, you'd be searching the wrong timestamp.
Delivery and logistics
A shipment from the UAE (UTC+4) departs at 11:00 PM local time. It arrives in Bangladesh (UTC+6) after a 3-hour flight. What's the local arrival time?
Departure: 11:00 PM UAE = 11:00 PM + 2 hours = 1:00 AM next day Dhaka Flight time: 3 hours Arrival Dhaka time: 1:00 AM + 3 hours = 4:00 AM Dhaka
Watching a live event abroad
A technology keynote is scheduled for 10:00 AM Pacific Time (UTC−7 in PDT, summer). What time is that in Dhaka?
10:00 AM PDT + 13 hours = 11:00 PM Dhaka (same day)
If it's winter (PST, UTC−8): 10:00 AM + 14 hours = midnight Dhaka (next day)
Daylight Saving Time: The Complication
About 70 countries observe daylight saving time (DST) — advancing clocks by one hour in spring and reverting in autumn. The US, UK, EU, and Australia all use DST; Bangladesh, India, Japan, UAE, and China do not.
This means the offset between Dhaka and London changes by one hour twice a year:
- Winter (Oct–Mar): Dhaka is 6 hours ahead of London (UTC+6 vs UTC+0)
- Summer (Mar–Oct): Dhaka is 5 hours ahead of London (UTC+6 vs UTC+1)
If you have a recurring weekly call scheduled based on a specific hour, the effective local time for the DST-observing party shifts by an hour when the clocks change. This catches people out every spring and autumn.
The time zone converter handles this automatically — it accounts for DST based on the specific date of the conversion.
UTC Offsets That Aren't Round Hours
Some countries use non-standard half or quarter-hour offsets:
- India: UTC+5:30 (half-hour offset — unique among large countries)
- Nepal: UTC+5:45 (quarter-hour offset — unique globally)
- Iran: UTC+3:30 (and UTC+4:30 during DST)
- Afghanistan: UTC+4:30
These cause complications for systems that assume hourly offsets. Dhaka to Kolkata: 6:00 - 5:30 = 30 minutes ahead. Dhaka to Kathmandu: 6:00 - 5:45 = 15 minutes ahead of Nepal. These small differences still matter for scheduling precision.
Tips for Cross-Timezone Scheduling
Always specify the time zone when scheduling. "3 PM" is not a time — "3 PM Dhaka (UTC+6)" is. Add the UTC offset to remove ambiguity, since city-based abbreviations can clash (IST means India Standard Time, Israel Standard Time, and Irish Standard Time).
Use UTC for technical logs and APIs. All server timestamps should be in UTC. Display local time in the UI; store and compute in UTC. This avoids the DST-related ambiguity that causes "that event appears twice" or "that event is missing" bugs around DST transitions.
Check the DST status before a recurring meeting. A standing weekly call needs to be reviewed twice a year when DST transitions occur. The week after "spring forward" in the US/UK, your Dhaka call will be one hour earlier or later than the previous week.
When crossing the International Date Line, the date changes. Flying from Bangladesh east to Los Angeles crosses the date line — you arrive on the same day or earlier than you left, despite hours of flying. The converter handles date changes automatically.
Frequently Asked Questions
What is UTC? Coordinated Universal Time — the international time standard. It doesn't observe daylight saving and is the baseline from which all other time zones are expressed as offsets.
Does Bangladesh observe daylight saving time? No. Bangladesh Standard Time is a fixed UTC+6, year-round. This makes working with Bangladesh time simpler than time zones that observe DST.
Why is India's time zone UTC+5:30? It's a political decision to keep the entire country in a single time zone despite its geographic width. A half-hour offset was chosen as a compromise between the eastern and western extremes of the country.
What's the difference between GMT and UTC? GMT (Greenwich Mean Time) and UTC are effectively the same for practical purposes. UTC is the scientific standard; GMT is the civil time zone based at the Greenwich meridian. The UK is in GMT in winter and BST (British Summer Time = UTC+1) in summer.
Is the time zone converter free? Yes — completely free, no sign-up required.
Time zone mistakes cost real hours and real money in remote work, international business, and software development. A 10-second check before scheduling any cross-border meeting is a small investment that eliminates a common and frustrating category of miscommunication.
Try the Time Zone Converter free at sadiqbd.com — instant conversion between any two time zones, with automatic DST handling.
