Tools tagged #date
Every ecech. tool tagged date: 10 free calculators and utilities across Date, Time & Timezone. No signup, runs in your browser.
Age Calculator
Months are not a fixed length, so dividing days by 365.25 gives a different answer from the calendar. This uses the calendar method every official form uses.
Time🕑Business Days
Counting the start day or not changes the answer by a day, and nobody states which they mean. Count between two dates, or add days to one, with both conventions shown.
Time🕑Date Calculator
Days are exact. Months clamp to the end of a shorter month and never come back, which is why monthly billing drifts after its first February.
Time🕑Date Format Tester
In Unicode patterns YYYY is the week-numbering year. 31 December 2019 renders as 2020, which is where the New Year date bugs come from.
Time🕑Epoch Rollover
It does not crash. It wraps to minus two billion and reports a date 137 years in the past, which is far harder to notice.
Time🕑FILETIME Converter
The 18-digit number in a registry export or an Active Directory dump. Too large for a JavaScript number, so parsing it the obvious way loses digits.
Time🕑Hours Between Times
Writing the clock form where payroll wants decimal loses 18 minutes an entry. Overnight shifts subtract to a negative unless you handle the wrap.
Time🕑ISO 8601 Date Format
Build a valid ISO 8601 string, or paste one and see exactly how it is interpreted — including why a date without a time lands in a different day.
Time🕑ISO 8601 Duration
The same letter M means month before the T and minute after it. Paste a duration to see the parts, and where a conversion to seconds is genuinely undefined.
Time🕑Timestamp Unit
1000000000 is September 2001 in seconds and January 1970 in milliseconds. Both parse, so validity cannot decide it. Here is every reading at once.
Time