[version] Set version number based on UTC time, not local time

Changelog.md

@@ -8,7 +8,7 @@
 * Change "Merged with youtube-dl" version in Readme.md if needed
 * Commit to master as `Release <version>`
 * Push to origin/release - build task will now run
-* Update version.py using devscripts\update-version.py (be wary of timezones)
+* Update version.py using devscripts\update-version.py
 * Run `make issuetemplates`
 * Commit to master as `[version] update :ci skip all`
 * Push to origin/master

devscripts/update-version.py

@@ -13,7 +13,7 @@ old_version_list = old_version.split(".", 4)
 old_ver = '.'.join(old_version_list[:3])
 old_rev = old_version_list[3] if len(old_version_list) > 3 else ''
 
-ver = datetime.now().strftime("%Y.%m.%d")
+ver = datetime.utcnow().strftime("%Y.%m.%d")
 rev = str(int(old_rev or 0) + 1) if old_ver == ver else ''
 
 VERSION = '.'.join((ver, rev)) if rev else ver

youtube_dlc/version.py

@@ -1,3 +1,3 @@
 from __future__ import unicode_literals
 
-__version__ = '2021.02.16'
+__version__ = '2021.02.15'