To add or subtract time: 1. Enter your starting date and time 2. Choose whether to add or subtract time using the dropdown 3. Enter the amount of time you want to add or subtract (years, months, days, hours, minutes, or seconds) 4. The calculator will show the resulting date and time For example, if you want to know what time it will be 36 hours after Wednesday at 9:00 AM, the calculator will show Friday at 9:00 PM.

To calculate a deadline or due date: 1. Enter the starting date and time 2. Select "Add" from the dropdown 3. Enter the amount of time until the deadline (e.g., 14 days for a two-week deadline) 4. The calculator will show the exact date and time of the deadline This is particularly useful for project planning, assignment due dates, or calculating when a payment is due.

To find a past date: 1. Enter the current or reference date and time 2. Select "Subtract" from the dropdown 3. Enter the amount of time to go back (e.g., 90 days) 4. The calculator will show the resulting past date and time This is useful for determining warranty periods, calculating birthdays, or finding historical dates based on known timeframes.

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks and time. It's crucial for: 1. International time coordination - UTC provides a consistent reference point for all time zones 2. Avoiding daylight saving time confusion - UTC doesn't change with seasons 3. Scientific and technical applications that require precise time synchronization All time zones are defined as offsets from UTC (e.g., Eastern Standard Time is UTC-5, meaning 5 hours behind UTC). Our calculators use UTC behind the scenes to ensure accurate time conversions and calculations regardless of daylight saving time or other regional time variations.