You enter a clock time and select source and target time zones. The tool looks up each zone's standard UTC offset, computes the difference, then adds that difference to the input hours. If the result exceeds 24 or drops below 0, it wraps to the next or previous day. It uses fixed standard-time offsets and does not apply daylight saving adjustments.
No. This converter uses standard UTC offsets year-round. During daylight saving periods, many regions shift by one hour, so the actual conversion may be off by an hour. Check near DST transition dates (typically March and November in North America).
India Standard Time is UTC+5:30, one of several zones that use a half-hour offset. The calculator handles fractional hours correctly. Nepal (UTC+5:45) and the Chatham Islands (UTC+12:45) are other examples of non-whole-hour offsets.
If adding the time-zone difference pushes the clock past midnight (24:00) or before midnight (0:00), the date changes. "Next day" means the converted time is on the following calendar day; "Previous day" means it falls on the day before your source date.
For practical purposes, yes — both represent the time at the prime meridian with zero offset. UTC is the modern standard maintained by atomic clocks, while GMT is the older astronomical term. This tool treats them identically (UTC+0).
Estimate only. Results reflect your inputs and standard formulas. Double-check important decisions independently.