Find timezone mistakes, epoch bugs, date arithmetic errors, ambiguous formats, and storage anti-patterns — before they silently corrupt your data.
Timezone-naive dates. Hardcoded month lengths. Y2038 time bombs. String-compared timestamps. Millisecond/second epoch confusion. Locale-dependent formatting that works in dev but breaks in production.
When the off-by-one hits production at 2 AM on DST changeover, it started here. DateGuard scans your entire codebase for date/time anti-patterns so your timestamps are trustworthy.
90 checks across 6 categories, covering every aspect of date and time handling.
Detects missing timezone in date creation, naive datetime operations, UTC not specified, timezone conversion errors, and DST-unsafe calculations that silently shift your data by hours.
Catches manual date formatting, locale-dependent parsing, two-digit year usage, ambiguous date formats (MM/DD vs DD/MM), and hardcoded date separators that break across locales.
Finds millisecond vs second epoch confusion, 32-bit timestamp usage risking Y2038 overflow, floating-point time storage, and Date.now() precision issues across environments.
Detects manual day/month calculation, not accounting for leap years, hardcoded days-in-month values, and DST-breaking duration math that drifts silently over time.
Catches string comparison of dates, regex-based date parsing, loose date validation that accepts invalid dates, and timezone-naive comparisons that produce wrong results.
Finds dates stored as strings, non-ISO formats in API payloads, timestamps without timezone in databases, and locale-dependent serialization that corrupts on deserialization.
Purpose-built date/time analysis beats guesswork every time.
| Capability | Manual Review | DateGuard | Generic Linters |
|---|---|---|---|
| Timezone anti-pattern detection | Inconsistent | 90 patterns | ✗ |
| Epoch precision validation | Expert required | ✓ Automated | ✗ |
| Leap year & DST analysis | Often missed | ✓ 15 checks | ✗ |
| Date format validation | Manual grep | ✓ Context-aware | ✗ |
| Y2038 risk detection | Very rare | ✓ Pattern matching | ✗ |
| Storage format analysis | Checklist-based | ✓ Automated | ✗ |
| Date comparison validation | Rarely checked | ✓ 15 checks | ✗ |
| Locale-dependent parsing | Missed in testing | ✓ Multi-locale | ✗ |
| Remediation guidance | None | Per-finding fixes | Generic docs |
| Scan time (1000 files) | Hours/Days | < 5 seconds | Minutes |
| Zero false positive mode | N/A | ✓ | ✗ |
| CI/CD integration | ✗ | ✓ SARIF | ✓ |
| Privacy (no upload) | ✓ | ✓ 100% local | Varies |
Start scanning for free. Upgrade when your timestamps demand it.
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Install DateGuard in 30 seconds. Find every timezone mistake, epoch bug, and date arithmetic error before they corrupt your data.