Banner, PeopleSoft, and Workday export feeds with missing VTIMEZONEs and broken RRULE syntax. We detect and repair 36+ RFC 5545 violations. Paste your feed URL to see exactly what's broken.
Paste the URL of your broken calendar feed
Detect 36+ RFC 5545 violations including missing VTIMEZONEs, broken RRULEs, and invalid UIDs. Get detailed error report.
Our repair engine automatically detects and remediates these common failures found in Higher Education calendar feeds at the network edge.
Calendar feed lacks VTIMEZONE definition for non-UTC times
Impact
Events appear at wrong time on iOS/Android (typically 4-8 hours off)
How Lokr Fixes It
We inject RFC 5545-compliant VTIMEZONE blocks automatically
RFC 5545 §3.6.5 requires VTIMEZONE components for all non-UTC DATETIME values
Recurrence rule has invalid syntax or unsupported values
Impact
Recurring events fail to repeat or show incorrect instances
How Lokr Fixes It
We sanitize RRULE syntax and normalize FREQ, BYDAY, UNTIL values
RFC 5545 §3.3.10 defines strict RRULE syntax requirements
UNTIL date type doesn't match DTSTART type (DATE vs DATETIME)
Impact
Recurring events end prematurely or extend indefinitely
How Lokr Fixes It
We normalize UNTIL to match DTSTART type and timezone
RFC 5545 §3.3.10 requires UNTIL to match DTSTART value type
DTSTAMP is more than 7 days old
Impact
Calendar clients may reject updates or fail cache invalidation
How Lokr Fixes It
We refresh DTSTAMP to current UTC time on every request
RFC 5545 §3.8.7.2 requires DTSTAMP to reflect last modification time
Text fields contain invalid escape sequences like \t or \r
Impact
Text appears garbled or with literal backslashes
How Lokr Fixes It
We normalize to RFC 5545-compliant escape sequences (\n, \,, \;)
RFC 5545 §3.3.11 defines valid escape sequences for TEXT
Lines exceed 75 octets without proper CRLF folding
Impact
Some strict parsers reject file or truncate long lines
How Lokr Fixes It
We apply RFC 5545-compliant 75-octet line folding with CRLF
RFC 5545 §3.1 requires lines to be folded at 75 octets
Need a deep dive into all 36+ RFC violations we support?
Legacy formats and device fragmentation break your infrastructure. Standardize your delivery layer today.
Professors update the syllabus, but the student's static ICS download remains outdated, leading to missed exams.
Canvas, Banner, and Salesforce all emit different calendar feeds. Students are forced to check three different apps.
International students and exchange programs struggle with class times rendering incorrectly on local devices.
Specialized infrastructure to remediate vertical-specific edge cases.
For Med & Nursing Schools: Ensure complex, rotating clinical shifts land accurately on student phones. No more excuses for missed rounds.
Dynamic updates for practice times, away games, and rain-outs. Keep the entire athletic department and student body aligned.
Direct sync with Ellucian Banner, PeopleSoft, and Workday Student. We handle the legacy data cleaning.
We don't sell to end-users. We build for the engineers and admins who have to keep the systems running.
"Ellucian Banner generates compliant ICS files for desktop, but they break on iOS. Lokr standardizes the output so students actually see their exam schedules."
James T.
University Registrar, Major State University
"Integrating Canvas was easy, but the calendar subscriptions were flaky. Lokr's proxy layer stabilized the Canvas feeds for over 40,000 students."
Elena R.
CIO, Private Research University
"We use Salesforce for alumni events. Lokr cleans the feed so alum on old Android devices still get the correct event times."
Marcus L.
Alumni Relations Tech Lead, Liberal Arts College
Diagnose errors and test the fix instantly.
Fix one critical feed.
Department-wide infrastructure.
Organization-wide infrastructure.
Higher Education departments utilize the Standard plan to remediate SIS export errors.
Standardize your campus calendar infrastructure.
Contact Sales, we’ll set up your perfect feed today.
Launch a production-grade proxy with Zero-Persistence security.
Review technical standards across Higher Ed, Logistics, and Enterprise IT.
Step-by-step remediation for Canvas, Greenhouse, Ellucian, and PeopleSoft.