Losing time tracking data after a crash is recoverable in most cases. Git history, calendar events, email threads, and Slack logs contain enough timestamped activity to reconstruct all but the most sparsely documented workdays. Act within 24 hours for the best results.
Your time tracking app just crashed, or your browser cleared local storage, or your SaaS provider had an outage — and a week of unsubmitted time entries has vanished. You need to invoice by Friday. The frustration is real, but the situation is rarely as catastrophic as it feels in the first five minutes. Your data is not gone. It is distributed across the digital trails you leave every time you write code, attend a meeting, or reply to an email.
Quick Answer — How to Recover Lost Time Tracking Data After a Crash: First, contact your time tracking provider’s support team; SaaS crashes almost always affect the front end, not the database. If data cannot be restored directly, reconstruct from three sources: (1)
git logfor coding sessions, (2) calendar exports for meetings, and (3) email and Slack timestamps for communication work. Most workdays can be rebuilt in under an hour. Mark every reconstructed entry clearly so the provenance is auditable.
How to Recover Lost Time Tracking Data After a Crash
Before attempting any reconstruction, take three minutes to assess the damage clearly. Guessing without a clear picture wastes time and leads to errors that are harder to fix later.
Establish the scope first:
- Which exact date range is affected? (Monday to now, or just the last two hours?)
- Which projects and clients had activity in that window?
- What was the format of your entries — were they rounded to 15 minutes, or free-form?
Once you know the scope, check the obvious recovery points before assuming the data is irretrievable:
- Check browser local storage — if you use a browser-based tracker, open the DevTools console, type
localStorageand scan for any surviving session keys. Some tools store a recovery buffer. - Look for automatic exports — many SaaS time trackers send weekly email summaries or allow CSV export from a history log. Check your inbox for any automated digests from the period in question.
- Contact your time tracking provider’s support — if you use a hosted tool, your data is almost certainly in their database. Crashes typically affect the front end, not the data layer. Support teams can often restore a snapshot within hours.
- Document the gap — write down which days and projects are affected before you start reconstructing. You need this list to verify that the finished reconstruction is complete.
Do not start estimating from memory without evidence. Reconstructed timesheets built on guesswork are inaccurate and hard to defend. Work from data.
How Do You Reconstruct a Timesheet from Git History?
Git history is the most reliable reconstruction source for developers. Every commit carries the author, a precise UTC timestamp, the branch name (which maps to a project), and a message describing the work.
# Extract your commits for a specific week
git log \
--author="Your Name" \
--since="2026-05-04" \
--until="2026-05-09" \
--format="%ai | %s | %D" \
--allThe output gives you a list of commit timestamps, messages, and branch names. Group them into work sessions using a 30-minute idle threshold — if two commits are more than 30 minutes apart, treat them as separate sessions. The first commit of a session is when you started; the last is when you finished that block.
Here is a practical Python snippet that does this automatically:
import subprocess, re
from datetime import datetime, timedelta
def git_sessions(author, since, until, idle_minutes=30):
result = subprocess.run(
["git", "log", "--author", author, "--since", since,
"--until", until, "--format=%ai|%s|%D", "--all"],
capture_output=True, text=True
)
entries = []
for line in result.stdout.strip().split("\n"):
if not line:
continue
parts = line.split("|", 2)
dt = datetime.fromisoformat(parts[0].strip())
entries.append({"time": dt, "msg": parts[1].strip(), "ref": parts[2].strip()})
entries.sort(key=lambda x: x["time"])
sessions, session = [], []
for entry in entries:
if session and (entry["time"] - session[-1]["time"]) > timedelta(minutes=idle_minutes):
sessions.append(session)
session = []
session.append(entry)
if session:
sessions.append(session)
return sessions
for s in git_sessions("Your Name", "2026-05-04", "2026-05-09"):
start = s[0]["time"].strftime("%Y-%m-%d %H:%M")
end = s[-1]["time"].strftime("%H:%M")
ref = s[0]["ref"].split(",")[0].strip()
print(f"{start}–{end} | {ref} | {len(s)} commits")Limitations to keep in mind: git captures coding and commit time, not time spent in meetings, code review, or planning sessions. Treat git-derived hours as a floor, not a ceiling. See how to reconstruct your timesheet from git history for a deeper walk-through of this approach, how git commits map to billable time for guidance on turning commit logs into invoice-ready entries, GitHub time tracking for tools that automate this extraction from GitHub repositories, and how to track time across multiple git repos if your work spans several repositories.
How Can Calendar Events and Email Help Rebuild a Timesheet?
Non-coding work — meetings, client calls, design reviews, async communication — leaves a different set of digital traces that complement the git record.
Google Calendar and Outlook are the most complete source for meeting time. Export the calendar for the affected week and note every event with start and end times. Include one-on-ones, standups, client calls, and internal reviews.
Email sent timestamps are a useful proxy for communication activity. A cluster of outbound emails between 14:00 and 15:30 on Tuesday suggests you were engaged in async collaboration during that window, even if there is no calendar event.
Slack and Teams message history provides a similar signal. Your activity feed shows when you were actively writing and responding. Periods of rapid back-and-forth indicate focused communication work; gaps indicate deep work or breaks. See how a Slack time tracking bot can capture this automatically to avoid manual reconstruction in future.
Project management tools (Jira, Linear, Notion) record status changes and comments with timestamps. A ticket moving from “In Review” to “Done” at 16:45 is evidence of time spent in review that afternoon. If your Jira entries are incomplete, see how to fix Jira time tracking gaps for targeted recovery steps.
For a more detailed guide to this approach, see how to backfill timesheets from calendar events. If you use Google Calendar as a primary source of truth, setting up the Google Calendar time tracking integration ensures future entries are captured automatically so reconstruction is never needed again.
Building a day-by-day reconstruction:
- Start a blank spreadsheet with one row per day
- Fill in confirmed meeting time from calendar exports
- Add committed coding time from git sessions
- Note email and Slack activity windows to fill gaps
- Use project tool timestamps to confirm task-level work
- Combine all sources to estimate the remaining time blocks
How Do You Turn Reconstruction Evidence into a Finished Timesheet?
Having a pile of digital evidence is not the same as having a timesheet. The conversion requires judgment and a clear methodology.
Map activities to projects and tasks: Each git session, meeting, and communication window needs a project label. Branch names and meeting titles usually make this straightforward. Ambiguous windows (like “checked Slack between 10 and 11”) should be attributed to the project that was most active that morning.
Use conservative estimates: When evidence gives you a range (you started around 9 and finished around 11), use the smaller number. Inflated estimates are harder to defend and erode client trust over time.
Flag reconstructed entries: Most time tracking tools allow notes on entries. Mark reconstructed entries with a brief note — “Reconstructed from git log and calendar, 2026-05-08” — so that you, your manager, and your client can see the provenance. This is not an admission of wrongdoing; it is professional transparency.
Get a second opinion where possible: If you were pair programming or on a call with a colleague, ask them to confirm the duration. A brief cross-check adds credibility to the reconstruction.
Document your methodology: Write a short paragraph explaining how you rebuilt the timesheet and which sources you used. Keep this with the timesheet itself. If an audit question arises six months later, you have a clear audit trail. See also what to do if you forgot to track time all week or what to do when billable hours do not match the invoice for related troubleshooting approaches.
What Backup Strategies Prevent Time Tracking Data Loss?
The best time to set up a backup strategy is immediately after experiencing data loss, when the pain is fresh.
Schedule weekly CSV exports. Most time tracking tools have an export function. Set a recurring calendar event for Friday afternoon to export the week’s data to a shared drive or local folder. One CSV per week takes 30 seconds and gives you a complete recovery point.
Prefer server-side storage over local browser storage. Any time tracking tool that relies on localStorage for persistence is one browser clear away from data loss. If your current tool stores data locally without automatic sync, switch to one with server-side storage.
Verify that sync is actually working. It is common for automatic sync to fail silently — a network error, an expired token, a permissions change. Once a month, check your account on a different device to confirm that recent entries are visible. If they are not, your sync is broken.
Keep a daily lightweight backup log. A two-line text file or Notion note written at end of day — “Monday: 3h auth refactor, 1h PR reviews, 1h standup/email” — takes 90 seconds and provides a human-readable recovery point that requires no tool access.
Use multi-source time tracking. The most resilient approach is tracking time from data sources that already have backups. Git history is backed up by your remote. Calendar data lives in Google or Microsoft’s infrastructure. When your time tracking is derived from those sources rather than stored exclusively in a single tool, no single failure can erase your records. This is the model Keito uses — your time data is derived from git commits and calendar events, both of which are already version-controlled and cloud-backed. See how to track time by task and project automatically for a practical guide to setting this up.
Key Takeaway
Lost time tracking data is almost always recoverable. Git history, calendar events, email, and Slack logs reconstruct most workdays in under an hour. Mark rebuilt entries clearly and document your method. The long-term fix is multi-source tracking where no single tool failure can erase your records.
Frequently Asked Questions
How do I recover lost time tracking data after a crash?
Start by checking if the data is truly lost — contact your provider’s support team, look for browser local storage, and check for any automated weekly exports. If the data cannot be restored directly, reconstruct it from git history (for coding time), calendar events (for meetings), and email or Slack timestamps (for communication work).
Can I reconstruct a timesheet from git history?
Yes. Run git log --author="Your Name" --since=<date> --until=<date> --format="%ai %s" --all to extract all your commits with timestamps. Group commits into sessions using a 30-minute idle threshold, map branch names to projects, and sum the session durations. This reliably recovers coding and commit time, but not meeting or planning time.
What should I do immediately after losing time tracking data?
Assess the scope first — what date range and which projects are affected. Then check browser local storage, look for automated email digests, and contact your provider’s support. Document the gap (which days and projects are missing) before you start reconstructing. Do not fill in entries from memory without evidence.
How do I prevent time tracking data loss in the future?
Set up weekly CSV exports, use a tool with server-side storage rather than browser local storage, and verify that automatic sync is working monthly. A short daily backup note takes under two minutes and gives you a human-readable recovery point that does not depend on any tool.
How long does it take to recover lost time tracking data after a crash?
Most developers can recover lost time tracking data after a crash within one to two hours. SaaS providers can often restore data directly within hours of a support request. When reconstruction is necessary, a typical workday can be rebuilt from git log, calendar exports, and email timestamps in 30 to 60 minutes. Acting within 24 hours gives the best results before browser caches and session logs expire. See how to track billable hours for prevention strategies that make future recovery unnecessary.
Can calendar events be used to rebuild a timesheet?
Yes. Export your calendar for the affected period and map each event to a project. Calendar data covers meetings, calls, and scheduled work blocks that are invisible to git. Combine it with git session data and email timestamps to build a complete picture of each day.
Time Tracking That Cannot Be Lost
Keito derives time data from git commits and calendar events — sources that are already backed up by your remote and your calendar provider. No local storage. No single point of failure.