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Ubify Core Engineering Team
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About This Tool
This bidirectional timestamp utility translates between Unix epoch timestamps and human-readable calendar dates in real time. It displays a live ticker of the current Unix timestamp and converts integer epoch seconds into standardized ISO 8601 UTC strings, and vice-versa.
### Unix Epoch Definition and Conversions The Unix timestamp (POSIX time) is defined as the number of elapsed seconds since the Unix Epoch of `1970-01-01T00:00:00Z` (midnight UTC on January 1, 1970), excluding leap seconds:
- **Timestamp to Human Date:** $\text{Date} = \text{new Date}(\text{Timestamp} \times 1000).\text{toISOString}()$ *Note:* JavaScript uses millisecond epochs internally, so the 10-digit second timestamp is multiplied by $1000$. - **Calendar Date to Timestamp:** $\text{Timestamp} = \left\lfloor \frac{\text{Date.parse}(\text{Date String})}{1000} \right\rfloor$ - **Year 2038 Context:** Legacy 32-bit signed integers overflow on January 19, 2038 at 03:14:07 UTC (`2147483647`). Modern JavaScript evaluates 64-bit float numbers, supporting timestamps past the year 275,000 without overflow risk.
### Concrete Conversion Example 1. **Epoch Integer:** Entering `1767225600` converts to **2026-01-01T00:00:00.000Z** (midnight UTC on New Year's Day 2026). 2. **Date Picker:** Selecting `2026-06-15T12:30` produces epoch integer **1781526600**.
### Privacy and Client-Side Execution All date formatting and integer math execute strictly within your local browser's JavaScript runtime. No timestamps, server logs, or date queries are sent across external networks.
How to Use
- 1
Check the current live Unix timestamp displayed in the top card.
- 2
Enter an epoch integer into the Timestamp to Date field to see the ISO 8601 UTC date string.
- 3
Alternatively, select a date and time using the datetime-local picker to calculate its integer Unix timestamp.
Frequently Asked Questions
Does this converter use seconds or milliseconds?
Standard Unix timestamps use seconds (10 digits for modern dates). JavaScript and web APIs typically use milliseconds (13 digits), requiring multiplication or division by 1000.
What timezone is the ISO date string formatted in?
The output is formatted in standard ISO 8601 UTC time, designated by the trailing Z.
Are timestamp conversions logged on a remote server?
No. All conversions evaluate locally in client-side JavaScript memory.