How to Input Date in Excel

What this does

TODAY returns the current date; NOW returns the date with the time attached. Both are volatile: they recalculate whenever anything in the workbook changes, so a cell holding =TODAY() is not a record of when something happened, it is always "now". That is the single most consequential thing to know about them — a timestamp meant to stay put must be entered with Ctrl+; (date) or Ctrl+Shift+; (time), or pasted as a value. Their genuine use is anything that should move with the calendar: ageing an invoice, counting days remaining, driving a conditional format for overdue rows. Keep the inputs visible and clearly labelled and the whole thing stays auditable — anyone who opens the file later, including you, can see at a glance exactly what feeds the result and change one assumption without hunting through the formula. For “input date in excel”, the reliable version is a short checking loop, not just the first command that appears to work. Run it on a deliberately small range first, watch how the affected cells change, and only then apply the same setup to the full sheet. When a formula is involved, keep the inputs labelled beside it, reference cells instead of typing values, and apply number formatting only after the result checks out. That is what makes a workflow that saves repeating the same clicks every week useful in real work: repeatable, auditable, and not dependent on memory or luck.

A worked example

Days a receivable has been outstanding: =TODAY()-A2, formatted as a number rather than a date. Flagging overdue rows with conditional formatting: =AND(A2<TODAY(), B2<>"Paid"). Days remaining until a deadline: =A2-TODAY(). A static stamp instead — press Ctrl+; which types the date once and never changes it. TODAY and NOW are what make an ageing report age itself — and knowing they are volatile is what stops them being used as timestamps. A practical tip before you scale it up: build it once on a small block of test data, confirm the number against the tool on this page, and only then point it at your real sheet. That one habit catches almost every mistake while it is still cheap to fix, long before a wrong figure reaches a report or a colleague.

In Google Sheets

Google Sheets handles this almost identically to Excel. The formula syntax above is the same, and the menu lives under a slightly different label rather than a ribbon tab. Use the platform toggle at the top of the page to switch every keyboard shortcut between Windows and Mac, and expect at most cosmetic differences in naming. The aim was to get you unstuck fast and leave you a little more capable than a copy-paste would. The answer is at the top, the tool proves it, and the detail above shows why it holds — so the next time a colleague asks, you can answer without reaching for search. The short version of “input date in excel”: the answer is at the top of this page, the tool proves it on your own numbers, and the sections above explain why it holds so the next variation does not stump you. Excel rewards people who reference cells instead of typing values and who keep inputs separate from formulas, because that is what makes a result you can audit months later. Build it once, deliberately, with the live tool as a check, and you convert a one-off lookup into a reusable skill — which is the whole point of learning the why and not just the what.

Common mistakes

• Using =TODAY() as a record of when something was entered, which rewrites itself every time the file opens.
• Formatting a date difference as a date, which shows 1900-01-15 instead of 14 days.
• Forgetting the brackets; =TODAY without them returns #NAME?.

Frequently asked questions