Reconcile timestamps
Retain each observation’s original timestamp, role and offset before converting instants to UTC.
Documents to open in this workflow
This order suggests a starting point; revisit a step if identifiers, dates or versions disagree. Access and reuse terms depend on each service.
IANA — Time Zone Database
Find civil-time rules, UTC offsets and daylight-saving changes in an identified tz database release.
What to record
Original text, IANA zone, explicit offset, precision, tz release and access date.
Source-specific check
Distinguish calendar date from instant. A local time without an offset may be ambiguous or nonexistent at a clock change.
Open source portalWayback Machine
Compare dated web-page captures and retain a link to a viewable version.
What to record
Original URL, capture URL, capture time and any missing or incomplete page elements.
Source-specific check
An archive shows a retrieved version at a time, not content accuracy or its creation date.
Open source portalRIPEstat
Examine public routing, IP prefix and autonomous system data in RIPEstat.
What to record
ASN or prefix, consulted module, period, measurement source and exported result.
Source-specific check
An observed route does not establish ownership; date measurements before linking infrastructure to an entity.
Open source portal
Matching condition
Keep role, original text, precision and offset; convert only defined instants.
If results disagree
Equal instants do not establish causation; ambiguous local time stays unresolved without documented rules.
Output to produce
Timeline with originals, UTC and ambiguities.
Separate documentary evidence, demonstrated links between documents and remaining inference. State the owner and review trigger.
Supporting methods
Producer references
Matching table to complete
This is a blank template, not a research result. Record the exact item and observation for each source before making the decision.
| Source | Document or exact URL | Date and version | Observation and passage | Scope and limit | Link established or unestablished |
|---|---|---|---|---|---|
| IANA — Time Zone Database | To record | To record | To record | To record | To record |
| Wayback Machine | To record | To record | To record | To record | To record |
| RIPEstat | To record | To record | To record | To record | To record |
Frequently asked questions
What link should be checked before matching results?
Keep role, original text, precision and offset; convert only defined instants.
What if sources appear to contradict each other?
Equal instants do not establish causation; ambiguous local time stays unresolved without documented rules.
Do the listed portals provide independent confirmation?
Not necessarily. Identify the producer and underlying document. Two interfaces distributing one item can check transcription but do not establish a fact independently twice.