time-zone offset, meeting-window, travel-day and UTC conversion planning calculators
Plan across time zones with explicit offsets
Convert hours with user-supplied UTC offsets and compare overlapping work windows without relying on a location database.
Tools
Offset Hour Converter
Convert a source clock hour using source and destination UTC offsets.
Open →ToolsTime-zone Gap
Calculate difference between two UTC offsets.
Open →ToolsWork-window Overlap
Estimate overlap between equal-length workdays separated by an offset gap.
Open →ToolsClock Shift after Travel
Calculate destination offset minus origin offset.
Open →ToolsCross-zone Meeting Load
Calculate monthly meeting hours from meeting count and duration.
Open →Guides
UTC offsets are inputs, not permanent city facts
Daylight-saving rules can change a location's offset during the year.
GuidesConvert via UTC
Subtract the source offset to reach UTC, then add the destination offset.
GuidesWatch for date changes
A converted raw hour can fall below 0 or above 23.
GuidesUse overlap as a planning baseline
A simple work-window overlap model assumes equal workday lengths and aligned starts.